Publications by authors named "Dmitry Irzhak"

3 Publications

  • Page 1 of 1

Single crystals of ferroelectric lithium niobate-tantalate LiNbTaO solid solutions for high-temperature sensor and actuator applications.

Acta Crystallogr B Struct Sci Cryst Eng Mater 2020 Dec 16;76(Pt 6):1071-1076. Epub 2020 Nov 16.

Universität Potsdam, Institut für Physik, Karl Liebknecht Str. 24-25, Potsdam, 14471, Germany.

Ferroelectric LiNbTaO solid solutions with various Nb/Ta ratio were grown from the melt by the Czochralski method. The exact composition of the grown crystals was determined by inductively coupled plasma atomic mass spectrometry. The dependence of the crystal composition on the composition of the initial melt was obtained and explained by a wide separation between the phase boundaries of the liquid and solid phases on the LiNbO-LiTaO phase diagram. Using high-resolution X-ray diffraction, the parameters a and c of a crystal unit cell were determined (LiNbTaO: a = 5.1574 Å and c = 13.8498 Å). Further, the Curie temperature T of the crystals was measured using the differential scanning calorimetry technique. T was found to depend on the composition of the crystals that allowed conditions for the monodomainization of the grown crystals to be defined (LiNbTaO: T = 1102°C; LiNbTaO: T = 794°C). Finally, the velocity of surface acoustic waves was determined by scanning electron microscopy and X-ray diffraction techniques (YZ-cut of a LiNbTaO crystal: V = 3440 m s).
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http://dx.doi.org/10.1107/S2052520620014390DOI Listing
December 2020

Raman Spectra of LaGaSiO Crystal Modulated by Bulk Acoustic Wave.

IEEE Trans Ultrason Ferroelectr Freq Control 2020 05 30;67(5):1048-1052. Epub 2019 Dec 30.

The influence of bulk acoustic wave excitation in langasite crystal on Raman spectra was studied. It was found that acoustic wave propagating in the crystal volume changes the intensity and position of the Raman scattering lines. Under bulk acoustic wave propagation conditions, Raman peak intensity changes less on 5% and peak position shifts on 0.5 cm. To detect such small changes, principal component analysis of Raman spectra was used.
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http://dx.doi.org/10.1109/TUFFC.2019.2962904DOI Listing
May 2020

X-ray topography analysis of acoustic wave fields in the SAW-resonator structures.

IEEE Trans Ultrason Ferroelectr Freq Control 2005 Nov;52(11):2081-7

Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, Laboratory of X-ray Acoustooptics, Chernogolovka, Russian Federation.

The formation of fields of standing surface acoustic waves (SAW) in LiNbO3 and La3Ga5SiO14 (LGS) crystals was studied by high-resolution topography method on a laboratory X-ray source. The fields of standing SAW were formed using SAW-resonator structures consisting of interdigital transducer (IDT) and reflecting gratings. The SAW amplitudes and power flow angles were measured by X-ray topography, diffraction in acoustic beam was visualized, and the SAW interaction with the crystal structure defects was studied.
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http://dx.doi.org/10.1109/tuffc.2005.1561678DOI Listing
November 2005