TY  - JOUR
A1  - Vadilonga, Simone
A1  - Zizak, Ivo
A1  - Roshchupkin, Dmitry
A1  - Evgenii, Emelin
A1  - Petsiuk, Andrei
A1  - Leitenberger, Wolfram
A1  - Erko, Alexei
T1  - Observation of sagittal X-ray diffraction by surface acoustic waves in Bragg geometry
JF  - Journal of applied crystallography
N2  - X-ray Bragg diffraction in sagittal geometry on a Y-cut langasite crystal (La3Ga5SiO14) modulated by Lambda = 3 mu m Rayleigh surface acoustic waves was studied at the BESSY II synchrotron radiation facility. Owing to the crystal lattice modulation by the surface acoustic wave diffraction, satellites appear. Their intensity and angular separation depend on the amplitude and wavelength of the ultrasonic superlattice. Experimental results are compared with the corresponding theoretical model that exploits the kinematical diffraction theory. This experiment shows that the propagation of the surface acoustic waves creates a dynamical diffraction grating on the crystal surface, and this can be used for space-time modulation of an X-ray beam.
KW  - surface acoustic waves
KW  - optics
KW  - synchrotron radiation
KW  - sagittal X-ray diffraction
Y1  - 2017
U6  - https://doi.org/10.1107/S1600576717002977
SN  - 1600-5767
VL  - 50
SP  - 525
EP  - 530
PB  - International Union of Crystallography
CY  - Chester
ER  - 
TY  - JOUR
A1  - Roshchupkin, Dmitry
A1  - Ortega, Luc
A1  - Plotitcyna, Olga
A1  - Erko, Alexei
A1  - Zizak, Ivo
A1  - Vadilonga, Simone
A1  - Irzhak, Dmitry
A1  - Emelin, Evgenii
A1  - Buzanov, Oleg
A1  - Leitenberger, Wolfram
T1  - Piezoelectric Ca3NbGa3Si2O14 crystal: crystal growth, piezoelectric and acoustic properties
JF  - Journal of geophysical research : Space physics
N2  - Ca3NbGa3Si2O14 (CNGS), a five-component crystal of lanthanum-gallium silicate group, was grown by the Czochralski method. The parameters of the elementary unit cell of the crystal were measured by powder diffraction. The independent piezoelectric strain coefficients d(11) and d(14) were determined by the triple-axis X-ray diffraction in the Bragg and Laue geometries. Excitation and propagation of surface acoustic waves (SAW) were studied by high-resolution X-ray diffraction at BESSY II synchrotron radiation source. The velocity of SAW propagation and power flow angles in the Y-, X-and yxl/+36 degrees-cuts of the CNGS crystal were determined from the analysis of the diffraction spectra. The CNGS crystal was found practically isotropic by its acoustic properties.
Y1  - 2016
U6  - https://doi.org/10.1007/s00339-016-0279-1
SN  - 0947-8396
SN  - 1432-0630
VL  - 122
SP  - 2803
EP  - 2812
PB  - Springer
CY  - New York
ER  -