Stress dependence of Raman vibrational bands of PbWO4 single crystals

Abstract

AbstractA 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 PbWO4 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)