Stress dependence of Raman vibrational bands of PbWO4single crystals

✍ Scribed by Zhu, W. L. ;Wan, K. S. ;Huang, Y. L. ;Feng, X. Q. ;Pezzotti, G.

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 550 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200521489

✦ Synopsis

Abstract

A microscopic piezo‐spectroscopic (PS) investigation of the stress dependence of the Raman bands of lead tungstate was conducted, which used a ball‐on‐ring flexure method, aimed at adding controlled biaxial stresses on thin‐plate samples. Spectral shifts varying with applied loads and in‐depth positions were observed for a ‐ and c ‐plane PbWO~4~ single crystals, confirmed by polarized Raman experiments. Taking account of the laser probe function, theoretical convolutions were performed to determine precisely the PS coefficients, which were determined as Π ~11~ = Π ~22~ = –1.29 ± 0.20 cm^–1^/GPa and Π ~33~ = –0.87 ± 0.25 cm^–1^/ GPa for the 902 cm^–1^ A ~g~ species. Accordingly, the residual stresses generated by mechanical treatments were analysed based on the derived coefficients. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)