Stress dependence of Raman vibrational bands of PbWO 4 single crystals
2006; Wiley; Volume: 203; Issue: 10 Linguagem: Inglês
10.1002/pssa.200521489
ISSN1862-6319
AutoresWenliang Zhu, Keshu Wan, Yanlin Huang, Xing Feng, Giuseppe Pezzotti,
Tópico(s)Gas Sensing Nanomaterials and Sensors
ResumoAbstract 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)
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