1,488 results match your criteria Acta Crystallographica Section B-Structural Science[Journal]


On the shortest B(III)-O bonds.

Authors:
Vasyl Sidey

Acta Crystallogr B 2013 Feb 19;69(Pt 1):86-9. Epub 2013 Jan 19.

Department of Chemistry and Research Institute for Physics and Chemistry of Solids, Uzhgorod National University, Pidgirna Street 46, Uzhgorod 88000, Ukraine.

For the crystal structures of oxoborates, the value of ~1.2 Å can be regarded as the lower physical limit for B(III)-O bond lengths. The oxoborate crystal structures with B(III)-O bond lengths shorter than ~1. Read More

View Article and Full-Text PDF
February 2013

A high-pressure polymorph of chlorpropamide formed on hydrostatic compression of the α-form in saturated ethanol solution.

Acta Crystallogr B 2013 Feb 19;69(Pt 1):77-85. Epub 2013 Jan 19.

Novosibirsk State University, REC-008, Pirogova 2, Novosibirsk 90, Russian Federation.

The crystal structure of the high-pressure polymorph (α') of an antidiabetic drug, chlorpropamide [4-chloro-N-(propylaminocarbonyl)benzenesulfonamide, C(10)H(13)ClN(2)O(3)S], which is formed at ~2.8 GPa from the α-polymorph (P2(1)2(1)2(1)) on hydrostatic compression in saturated ethanol solution, has been determined. As a result of the phase transition, the a, c and α parameters change jumpwise, whereas the changes in b parameter are continuous through the phase transition point. Read More

View Article and Full-Text PDF
February 2013

Thermodynamic and structural relationships between the two polymorphs of 1,3-dimethylurea.

Acta Crystallogr B 2013 Feb 20;69(Pt 1):70-6. Epub 2012 Dec 20.

Institut für Anorganische Chemie, Universität Kiel, Max-Eyth-Strasse 2, D-22418 Kiel, Germany.

The title compound exists as polymorph (I), Fdd2 with Z = 8 [Pérez-Folch et al. (1997). J. Read More

View Article and Full-Text PDF
February 2013

Entry point into new trimeric and tetrameric imide-based macrocyclic esters derived from isophthaloyl dichloride and methyl 6-aminonicotinate.

Acta Crystallogr B 2013 Feb 20;69(Pt 1):62-9. Epub 2012 Dec 20.

School of Chemical Sciences, Dublin City University, Dublin 9, Ireland.

The one-step reaction of isophthaloyl dichloride with the 2-aminopyridine derivative (methyl 6-aminonicotinate) yields (i) a trimer-based macrocycle (EsIO)(3) and (ii) a tetramer-based macrocycle (EsIO)(4) in modest isolated synthetic yields (total of 25%), together with (iii) longer open-chain oligomers. The macrocyclization relies on the semi-flexible imide hinge formed by reaction of the 2-amino(pyridine) functional group with two acyl chloride functional groups. The determining factors in macrocycle synthesis are: (a) imide formation using the heteroaromatic ortho-N functionality; (b) the inherent ability of the imide to twist by 85-115° from planarity (as measured by the CO···CO imide torsion angles), thereby providing a hinge for macrocyclic ring closure or potentially (non)helical assembly in oligomer/polymer formation; (c) the conformational flexibility of the isophthaloyl group with meta-related carbonyl groups to twist and adopt either syn or anti conformations, although the syn conformation is observed structurally for all isophthaloyl groups in both (EsIO)(3) (trezimide) and (EsIO)(4) (tennimide) macrocycles. Read More

View Article and Full-Text PDF
February 2013

Structural and electronic aspects of hydrogen bonding in two polymorphs of butylene-N,N'-bis(O,O'-diarylphosphoramidate).

Acta Crystallogr B 2013 Feb 20;69(Pt 1):55-61. Epub 2012 Dec 20.

Department of Chemistry, Tarbiat Modares University, PO Box 14115-175, Tehran, Iran.

The bisphosphoramidate (C(6)H(5)O)(2)P(O)NH(CH(2))(4)NHP(O)(OC(6)H(5))(2) crystallizes in two polymorphs, one (ndl) with a needle habit from tetrahydrofuran (THF)/ethanol and another (prm) which forms prisms from H(2)O/ethanol. The molecules in the two forms differ from each other in some torsion angles and the orientation of the diaminobutane bridge, although the differences between the similar bond lengths are not significant for the two polymorphs. The geometry optimizations at the B3LYP/6-31+G* level for isolated molecules show that the two conformers which exist in the crystalline state also represent local gas-phase energy minima. Read More

View Article and Full-Text PDF
February 2013

Weak intermolecular hydrogen and halogen interactions in an isomorphous halogen series of pseudoterpyridine Zn(II) complexes.

Acta Crystallogr B 2013 Feb 19;69(Pt 1):43-54. Epub 2013 Jan 19.

Institut Européen des Membranes, ENSCM-UMII-CNRS, Place Eugène Bataillon, Montpellier 34095, France.

The synthesis and characterization of a series of halogen-substituted pseudoterpyridine Zn(II) homoleptic mononuclear complexes, based on ligands L(11)-L(44) [2,6-pyridinedicarboxaldehydebis(p-R-phenylimines), R = F, Cl, Br, I] are reported. Neither of the structures contain relatively strong classical hydrogen bonds (OH···O, NH···O, OH···N, NH···N) and the structure packing is thus determined by a subtle interplay of weaker interactions. Isostructurality of the four halogen analogues is very rare, and in this study -Br, -Cl and -F are found to be isostructural in different degrees, whereas -I is not. Read More

View Article and Full-Text PDF
February 2013

Electronic influence of β-diketonato-type ligands on the coordination of 1,5-cyclooctadiene to palladium(II) as defined by 'Venus fly trap' geometric parameters.

Acta Crystallogr B 2013 Feb 20;69(Pt 1):36-42. Epub 2012 Dec 20.

Department of Chemistry and the Strategic Academic Cluster for Materials and Nanosciences, University of the Free State, Bloemfontein, South Africa.

A range of single-crystal structures of the type [Pd(cod)(LL'-Bid)]A, where LL'-Bid = acetylacetonato (acac), thenoyltrifluoroactetonato (thtfac) and hexafluoroacetylacetonato (hfacac), and A = tetrafluoroborate (BF(4)(-)) and hexafluorophosphate (PF(6)(-)), are reported. The complexes [Pd(cod)(acac)]PF(6) (I), [Pd(cod)(thtfac)]PF(6) (III), [Pd(cod)(thtfac)]BF(4) (IV) and [Pd(cod)(hfacac)]PF(6) (V) are isostructural in the monoclinic space group P2(1)/c. The influence of the variation of the β-diketonato-type ligands on the coordination geometry of cis,cis-1,5-cycloocta-1,5-diene (cod) was investigated and found that no significant changes to the Pd-C and C=C bond distances were observed. Read More

View Article and Full-Text PDF
February 2013

Structural transformations in the low-temperature grown GaAs with superlattices of Sb and P δ-layers.

Acta Crystallogr B 2013 Feb 19;69(Pt 1):30-5. Epub 2013 Jan 19.

Ioffe Physical-Technical Institute, Politekhnicheskaya 26, 194021 St Petersburg, Russian Federation.

The structure of low-temperature grown GaAs with equidistant δ-layers of Sb and P was studied by analysis of the X-ray curves, which was supported by optical absorption measurements and transmission electron microscopy. The simultaneous fitting of the X-ray reflectivity curve and diffraction ones for GaAs (004) and GaAs (115) crystallographic planes provided reliable information about the period of δ-layer superlattice, thickness of the Sb and P δ-layers, and amount of excess As. Variation of these parameters was documented when excess As precipitated into As nanoinclusions upon annealing. Read More

View Article and Full-Text PDF
February 2013

The role of the coordination defect (CD) in the structures of anion-deficient, fluorite-related compounds.

Acta Crystallogr B 2013 Feb 19;69(Pt 1):17-29. Epub 2013 Jan 19.

1/1 Wellington Tce, Fullarton, South Australia 5063, Australia.

The various superstructure phases that occur with the anion-deficient compositions of binary oxides MO(2-x) with the fluorite structure as parent are explored here in terms of the original 'coordination defect' (or CD) concept in which each vacant oxygen site, □, is 'coordinated' by six O atoms thereby creating the octahedral 'structure-determining' entity [M(3.5)□O(6)]. It emerges that the structure and composition of each anion-deficient (polymorph) phase can be described in terms of crystallographic `motifs' which comprise sets of parallel coplanar polygons based on ½<210>(F) and ½<111>(F) CD linkages. Read More

View Article and Full-Text PDF
February 2013

The charge-flipping algorithm in crystallography.

Acta Crystallogr B 2013 Feb 19;69(Pt 1):1-16. Epub 2013 Jan 19.

Institute of Physics of the ASCR, v.v.i., Na Slovance 2, 18221 Prague, Czech Republic.

The charge-flipping algorithm (CFA) is a member of the diverse family of dual-space iterative phasing algorithms. These algorithms use alternating modifications in direct and reciprocal space to find a solution to the phase problem. The current state-of-the-art CFA is reviewed and it is put in the context of related dual-space algorithms with relevance for crystallography. Read More

View Article and Full-Text PDF
February 2013

The polymorphs of ROY: application of a systematic crystal structure prediction technique.

Acta Crystallogr B 2012 Dec 16;68(Pt 6):677-85. Epub 2012 Nov 16.

Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, England.

We investigate the ability of current ab initio crystal structure prediction techniques to identify the polymorphs of 5-methyl-2-[(2-nitrophenyl)amino]-3-thiophenecarbonitrile, also known as ROY because of the red, orange and yellow colours of its polymorphs. We use a methodology combining the generation of a large number of structures based on a computationally inexpensive model using the CrystalPredictor global search algorithm, and the further minimization of the most promising of these structures using the CrystalOptimizer local minimization algorithm which employs an accurate, yet efficiently constructed, model based on isolated-molecule quantum-mechanical calculations. We demonstrate that this approach successfully predicts the seven experimentally resolved structures of ROY as lattice-energy minima, with five of these structures being within the 12 lowest energy structures predicted. Read More

View Article and Full-Text PDF
December 2012

Solvatomorphism of 9,9'-[1,3,4-thiadiazole-2,5-diylbis(2,3-thiophendiyl-4,1-phenylene)]bis[9H-carbazole]: isostructurality, modularity and order-disorder theory.

Acta Crystallogr B 2012 Dec 23;68(Pt 6):667-76. Epub 2012 Oct 23.

Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-SC, 1060 Vienna, Austria.

During a systematic investigation of the crystallization behaviour of 9,9'-[1,3,4-thiadiazole-2,5-diylbis(2,3-thiophendiyl-4,1-phenylene)]bis[9H-carbazole] (I), six single crystalline solvates were obtained and characterized by X-ray diffraction at 100 K. The structure of the hemi-2-butanone (MEK) solvate contains two crystallographically independent molecules of (I) related by pseudo-inversion symmetry. The structure is polytypic and composed of non-polar (I) layers and polar solvent layers. Read More

View Article and Full-Text PDF
December 2012

Structures of four polymorphs of the pesticide dithianon solved from X-ray powder diffraction data.

Acta Crystallogr B 2012 Dec 23;68(Pt 6):661-6. Epub 2012 Oct 23.

Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany.

The crystal structures of four polymorphs of the pesticide dithianon (5,10-dihydro-5,10-dioxonaphtho[2,3-b]-1,4-dithiine-2,3-dicarbonitrile) have been solved from powder diffraction data and refined using the Rietveld method. Three polymorphs crystallize in non-centrosymmetric space groups. Two polymorphs have Z' > 1. Read More

View Article and Full-Text PDF
December 2012

Experimental and database-transferred electron-density analysis and evaluation of electrostatic forces in coumarin-102 dye.

Acta Crystallogr B 2012 Dec 16;68(Pt 6):646-60. Epub 2012 Nov 16.

Laboratoire de Cristallographie, Résonance Magnétique et Modélisations (CRM²), CNRS, UMR 7036, Institut Jean Barriol, Faculté des Sciences et Technologies, Université de Lorraine, BP 70239, 54506 Vandoeuvre-lès-Nancy CEDEX, France.

The electron-density distribution of a new crystal form of coumarin-102, a laser dye, has been investigated using the Hansen-Coppens multipolar atom model. The charge density was refined versus high-resolution X-ray diffraction data collected at 100 K and was also constructed by transferring the charge density from the Experimental Library of Multipolar Atom Model (ELMAM2). The topology of the refined charge density has been analysed within the Bader `Atoms In Molecules' theory framework. Read More

View Article and Full-Text PDF
December 2012

The first report of the crystal structure of non-solvated μ-oxo boron subphthalocyanine and the crystal structures of two solvated forms.

Acta Crystallogr B 2012 Dec 16;68(Pt 6):636-45. Epub 2012 Nov 16.

Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, Canada M5S 3E5.

The first instance of the solvent-free X-ray determined single-crystal structure of the oxygen-bridged boron subphthalocyanine dimer [μ-oxo-(BsubPc)(2), C(48)H(24)B(2)N(12)O] is reported. Single crystals obtained by train sublimation were found to have μ-oxo-(BsubPc)(2) organized into a C2/c space group. The crystal structure obtained by sublimation is of particular interest as it is highly symmetric and also of notably high density when compared with other BsubPc crystals. Read More

View Article and Full-Text PDF
December 2012

Charge-density distribution in potassium dihydrogen phosphoglycolate--a comparison of phosphate and phosphonate groups.

Acta Crystallogr B 2012 Dec 23;68(Pt 6):625-35. Epub 2012 Oct 23.

Wydział Chemii, Uniwersytet Wrocławski, ul. F. Joliot-Curie 14, 50-383 Wrocław, Poland.

Analysis of the experimental and theoretical charge-density distribution in potassium dihydrogen phosphoglycolate has been performed. The P-O bonds in the phosphate group are more polarized and the P atom is more positively charged than in phosphonate groups. The P-O bonds belong to a transit closed-shell (or polar covalent) class, while the ester C-O bond is a covalent (or shared-shell) bond. Read More

View Article and Full-Text PDF
December 2012

Hydrothermal synthesis and crystal structure of novel bis(6-carboxypyridine-2-carboxylato-κ3O2,N,O6)nickel(II) trihydrate, Ni(Hpydc)2·3H2O.

Acta Crystallogr B 2012 Dec 16;68(Pt 6):619-24. Epub 2012 Nov 16.

Post-Graduate Department of Chemistry, University of Jammu, Jammu Tawi 180 006, India.

The synthesis and crystal structure of the compound bis(6-carboxypyridine-2-carboxylato-κ(3)O(2),N,O(6))nickel(II) trihydrate, Ni(Hpydc)(2)·3H(2)O, with a supramolecular network is reported (H(2)pydc is pyridine-2,6-dicarboxylic acid). The compound has been prepared by hydrothermal methods. The crystal structure has been solved by direct methods using single-crystal X-ray diffraction data collected at 293 K and refined by full-matrix least-squares procedures to a final R value of 0. Read More

View Article and Full-Text PDF
December 2012

Structures from MnX2 and proline: isomorphous racemic compounds and a series of chiral non-isomorphous chain polymers.

Acta Crystallogr B 2012 Dec 16;68(Pt 6):610-8. Epub 2012 Nov 16.

Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, Aachen 52074, Germany.

Reactions of manganese(II) chloride, bromide and iodide with proline as an enantiopure and racemic ligand result in six crystalline solids for which diffraction experiments have been performed at 100 K. For two of these compounds, crystal structures at ambient temperature had been reported previously. The most surprising outcome of our systematic comparison lies in the role of chirality: with enantiopure proline three different coordination polymers have been obtained, whereas racemic proline yields isomorphous mononuclear complexes under the same reaction conditions. Read More

View Article and Full-Text PDF
December 2012

Dinuclear oxofluorometallates as a new structural type of d(0) transition metal oxofluoride compound.

Acta Crystallogr B 2012 Dec 16;68(Pt 6):602-9. Epub 2012 Nov 16.

Institute of Chemistry, Far Eastern Branch of RAS, Pr. Stoletiya 159, Vladivostok 690022, Russian Federation.

Five isomorphous d(0) transition metal oxofluoride compounds A(3)[M(2)O(x)F(11-x)]·(AF)(0.333) (A = K, Rb, NH(4); M = Nb, Mo, W; x = 2, 4) have been synthesized from acid fluoride solutions, and their crystal structures have been determined by single-crystal X-ray diffraction. The basic structural building units are dinuclear M(2)X(11) (dimers) formed from NbOF(5) or Mo(W)O(2)F(4) octahedra connected by the fluorine bridging atom. Read More

View Article and Full-Text PDF
December 2012

Mode-crystallography analysis and magnetic structures of SrLnFeRuO6 (Ln = La, Pr, Nd) disordered perovskites.

Acta Crystallogr B 2012 Dec 16;68(Pt 6):590-601. Epub 2012 Nov 16.

Fisika Aplikatua II Saila, Zientzia eta Teknologia Fakultatea, UPV/EHU, PO Box 644, 48080 Bilbao, Spain.

The crystal and magnetic structures of SrLnFeRuO(6) (Ln = La, Pr, Nd) double perovskites have been investigated. All compounds crystallize with an orthorhombic Pbnm structure at room temperature. These materials show complete chemical disorder of Fe and Ru cations for all compounds. Read More

View Article and Full-Text PDF
December 2012

Comparative structural study of decagonal quasicrystals in the systems Al-Cu-Me (Me = Co, Rh, Ir).

Acta Crystallogr B 2012 Dec 16;68(Pt 6):578-89. Epub 2012 Nov 16.

Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Al. Mickiewicza 30, Krakow 30-059, Poland.

A comparative single-crystal X-ray diffraction structure analysis of the family of Al-Cu-Me (Me = Co, Rh and Ir) decagonal quasicrystals is presented. In contrast to decagonal Al-Cu-Co, the other two decagonal phases do not show any structured disorder diffuse scattering indicating a higher degree of order. Furthermore, the atomic sites of Rh and Ir can be clearly identified, while Cu and Co cannot be distinguished because of their too similar atomic scattering factors. Read More

View Article and Full-Text PDF
December 2012

On the structural relations of malachite. II. The brochantite MDO polytypes.

Acta Crystallogr B 2012 Dec 23;68(Pt 6):571-7. Epub 2012 Oct 23.

Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, Berlin D-14195, Germany.

The structural relation between malachite and the brochantite MDO (maximum degree of order) polytypes is discussed. It is demonstrated that the same building blocks which form the basis of brochantite polytypism also occur in malachite. The different arrangements of these building blocks in the two mineral structures are rationalized as a result of the different coordination geometries required by the respective non-metal atoms acting as linkers. Read More

View Article and Full-Text PDF
December 2012

Structural transformation of Sb-based high-speed phase-change material.

Acta Crystallogr B 2012 Dec 23;68(Pt 6):559-70. Epub 2012 Oct 23.

Device Solutions Center, R&D Division, Panasonic Corporation, 3-1-1 Yagumo-Nakamachi, Moriguchi, Osaka 570-8501, Japan.

The crystal structure of a phase-change recording material (the compound Ag(3.4)In(3.7)Sb(76. Read More

View Article and Full-Text PDF
December 2012

Single-crystal investigation of L-tryptophan with Z' = 16.

Acta Crystallogr B 2012 Oct 13;68(Pt 5):549-57. Epub 2012 Sep 13.

Department of Chemistry, University of Oslo, Oslo, Norway.

A complex, disorder-free structure in the space group P1 has been established for L-tryptophan, for which no crystal structure has previously been available. The 16 molecules in the asymmetric unit can be divided into two groups of eight; one where the side chains have gauche orientations and one with trans orientations. Molecules within each group have almost identical molecular geometries. Read More

View Article and Full-Text PDF
October 2012

Structure of twisted BNC nanotubes with polygonal cross-section.

Acta Crystallogr B 2012 Oct 13;68(Pt 5):543-8. Epub 2012 Sep 13.

Technological Institute for Superhard and Novel Carbon Materials (TISNCM), Troitsk, Moscow Region, Russian Federation.

BNC nanotubes and nanofibers have been synthesized in the high isostatic pressure apparatus in Ar at 1923 K and 1.5 MPa in the presence of yttrium aluminium garnet. Some of the nanotubes obtained were filled with Al(2)O(3). Read More

View Article and Full-Text PDF
October 2012

Four polymorphs (polytypes) of 5,6-dimethylbenzofurazan 1-oxide.

Acta Crystallogr B 2012 Oct 13;68(Pt 5):536-42. Epub 2012 Sep 13.

Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431, USA.

5,6-Dimethylbenzofurazan 1-oxide (Me2BF), C(8)H(8)N(2)O(2), occurs in four polymorphic forms that are polytypes of each other. Each polymorph of Me2BF contains molecules disordered about pseudo-twofold axes and arranged head-to-tail in ribbons, with the ribbons forming approximately planar layers held together by weak C-H···N and C-H···O interactions. Adjacent layers interact in different ways in the different polymorphs. Read More

View Article and Full-Text PDF
October 2012

Topological studies of three related metal-organic frameworks of GdIII and 5-nitroisophthalate.

Acta Crystallogr B 2012 Oct 17;68(Pt 5):528-35. Epub 2012 Aug 17.

Centre for Supramolecular Chemistry, Department of Chemistry, University of Cape Town, Rondebosch, Cape Town 7701, South Africa.

The reaction of 5-nitroisophthalic acid (H(2)NIA) with Gd(NO(3))(3)·6H(2)O in DMF afforded three new metal-organic frameworks: [Gd(NIA)(1.5)(DMF)(2)]·DMF (I), [Gd(2)(NIA)(3)(DMF)(4)]·xH(2)O (II) and [Gd(4)(NIA)(6)(DMF)(5.5)(H(2)O)(3)]·4DMF·H(2)O (III). Read More

View Article and Full-Text PDF
October 2012

Unique thermodynamic relationships for ΔfHo and ΔfGo for crystalline inorganic salts. I. Predicting the possible existence and synthesis of Na2SO2 and Na2SeO2.

Acta Crystallogr B 2012 Oct 13;68(Pt 5):511-27. Epub 2012 Sep 13.

Universidad de Burgos, Parque Científico y Tecnológico, Burgos 09001, Spain.

The concept that equates oxidation and pressure has been successfully utilized in explaining the structural changes observed in the M(2)S subnets of M(2)SO(x) (x = 3, 4) compounds (M = Na, K) when compared with the structures (room- and high-pressure phases) of their parent M(2)S `alloy' [Martínez-Cruz et al. (1994), J. Solid State Chem. Read More

View Article and Full-Text PDF
October 2012

Theoretical hardness calculated from crystallo-chemical data for MoS2 and WS2 crystals and nanostructures.

Authors:
M I Petrescu

Acta Crystallogr B 2012 Oct 17;68(Pt 5):501-10. Epub 2012 Aug 17.

Faculty Materials Science and Engineering, University Politehnica of Bucharest, Bucharest 060042, Romania.

The calculation of the hardness of Mo and W disulfides using a crystallo-chemical model provides a unique opportunity to obtain separate quantitative information on the maximum hardness H(max) governed by strong intra-layer covalent bonds acting within the (0001) plane versus the minimum hardness H(min) governed by weak inter-layer van der Waals bonds acting along the c-axis of the hexagonal lattice. The penetration hardness derived from fundamental crystallo-chemical data (confirmed by experimental determinations) proved to be far lower in MS(2) (M = Mo, W) than in graphite and hexagonal BN, both for H(max) (H(graph)/H(MoS2) = 3.85; H(graph)/H(WS2) = 3. Read More

View Article and Full-Text PDF
October 2012

Crystal structures of calcium hemicarboaluminate and carbonated calcium hemicarboaluminate from synchrotron powder diffraction data.

Acta Crystallogr B 2012 Oct 17;68(Pt 5):493-500. Epub 2012 Aug 17.

Max-Planck-Institute for Solid State Research, Stuttgart, Germany.

One of the main phases formed at the beginning of the carbonation reaction of cementitious building materials is the calcium hemicarboaluminate (abbreviated as Hc). This AFm (shorthand for hydrated calcium aluminate phases structurally related to hydrocalumite) phase was synthesized, crystallized and then studied by synchrotron X-ray powder diffraction and micro-Raman spectroscopy. At room temperature and standard experimental conditions two major cementitious phases were detected, the Hc phase (as a major phase) and carbonated calcium hemicarboaluminate (abbreviated as cHc). Read More

View Article and Full-Text PDF
October 2012