High-pressure X-ray diffraction study of tungsten diselenide

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• 作者：Emre Selvi ; Resul Aksoy ; Russell Knudson ; Yanzhang Ma
• 关键词：C. High pressure ; C. X-ray diffraction ; D. Equation-of-state
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2008
• 出版时间：September 2008
• 年：2008
• 卷：69
• 期：9
• 页码：2311-2314
• 全文大小：288 K

文摘

Synchrotron X-ray diffraction was used in conjunction with a diamond anvil cell to investigate the properties of a tungsten diselenide (WSe₂) sample to 35.8 GPa at room temperature. By fitting the pressure–volume data to the third-order Birch–Murnaghan equation of state, the bulk modulus, K_0T, of WSe₂ was determined to be 72±1 GPa with its pressure derivative, , being 4.1±0.1. It was also found that the c-direction of the hexagonal structure is significantly more compressible than the a-direction. No phase transformation was clearly observed in the pressure range of our measurements.