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Influence of thermal treatment and radiation on some electrophysical parameters of langasite crystals

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5 Author(s)
M. F. Dubovik ; Inst. for Single Crystals, Kharkiv, Ukraine ; Yu. A. Zagoruiko ; T. I. Korshikova ; Yu. S. Shmaly
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La3Ga5SiO14 (LGSO) is a promising material for piezoengineering and acoustoelectronics. Studied in the present research is the influence of thermal treatment at T⩾1227 K on the electrophysical parameters of langasite samples subjected to the action of direct electric current at E⩾400 V×cm-1, T>627 K and β-radiation at D⩽106 Rd. It is found that rhodium-doped LGSO crystals have an original rose-brown coloration. This coloration becomes more intense in the anode-adjacent parts at the increase of the treatment duration and the intensity of the applied electric field. Such samples are characterized by the presence of an absorption band at λ=0.58 μm in the optical trans-transmission spectra, electrical resistivity e>1010 Ohm×cm, tangent of dielectric loss angle tgS⩽0.01 The electrical characteristics of Y-cut plates of LGSO are measured before and after thermal treatment. It is shown that after 15 minutes long electric field annealing at T≃688 K with E≃430 V×cm-1 the plates of LGSO have less stable electrical characteristics in comparison with those of samples annealed in air at T≈1223 K for 6 hours

Published in:

Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.

Date of Conference:

5-7 Jun 1996