Improvement in crystalline perfection, piezo-electric property and optical transparency of in-situ poled Fe-LiNbO3single crystals by post growth annealing and poling
✍ Scribed by Budakoti, G. C. ;Kumar, B. ;Bhagavannarayana, G. ;Soni, N. C.
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 187 KB
- Volume
- 202
- Category
- Article
- ISSN
- 0031-8965
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✦ Synopsis
Abstract
Crystalline perfection, piezoelectric response and optical transparency of in‐situ poled Fe–LiNbO~3~ single crystals was studied. Very low angle grain boundaries and the variations in the piezoelectric charge constant d~33~ were observed in the as‐grown crystals. Grain boundaries were successfully removed at higher annealing temperatures but the d~33~ value was decreased. Low crystalline perfection and d~33~ were observed after poling the annealed specimen. These parameters were improved by low temperature annealing followed by very slow cooling. FTIR spectra revealed that OH^–^ and CO~3~^2–^ ionic defects were present in the as‐grown crystals. The OH^–^ ion concentration was reduced, CO~3~^2–^ ions were removed and optical quality was improved after annealing at higher temperatures. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)