The crystallization and optical properties of LiNbO3 single crystals
LiNbO3 single crystals were grown by the Czochralski technique in an air atmosphere. The critical crystal diameter Dc = 1.5 cm and the critical rate of rotation wc = 35 rpm were calculated from the dynamic of fluids equations for buoyancy-driven and forced convections under which the shape...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Serbian Chemical Society
2000-01-01
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| Series: | Journal of the Serbian Chemical Society |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2000/0352-51390006391G.pdf |
| Summary: | LiNbO3 single crystals were grown by the Czochralski technique in an air
atmosphere. The critical crystal diameter Dc = 1.5 cm and the critical rate
of rotation wc = 35 rpm were calculated from the dynamic of fluids equations
for buoyancy-driven and forced convections under which the shape of the
melt/crystal interface changed. The domain inversion was carried out at 1473
K using a 10 min 3.75 V/cm electric field. The obtained crystals were cut,
polished and etched to determine the presence of dislocations and single
domain structures. The lattice parameters a = 0.51494 nm, c = 1.38620 nm and
V = 0.3186 nm 3 were determined by X-ray powder diffraction. The optical
properties were studied by infrared spectroscopy in the wave number range
20. 5000 cm -1. With decreasing temperature, an atypical behaviour of the
phonon modes, due to the ferroelectric properties of LiNbO3 single crystal,
could be seen. The optical constants were calculated by Kramers-Kronig
analysis and the value of the critical temperature was estimated. The
obtained results are discussed and compared with published data. |
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| ISSN: | 0352-5139 1820-7421 |