Measurement and analysis of nonhydrostatic lattice strain component in niobium to 145 GPa under various fluid pressure-transmitting media

Singh, AK and Takemura, Kenichi (2001) Measurement and analysis of nonhydrostatic lattice strain component in niobium to 145 GPa under various fluid pressure-transmitting media. Journal of Applied Physics, 90 (7). pp. 3269-3275. ISSN 0021-8979

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Abstract

The d spacings in niobium have been measured to 145 GPa with a diamond anvil cell using a fluid13; pressure-transmitting medium methanolx2013;ethanolx2013;water MEW mixture, or helium. The13; conventional geometry, wherein the primary x-ray beam passes parallel to the load axis with image13; plate, has been used to record the diffraction patterns. The analysis of the d spacings using the lattice13; strain equations indicates the presence of nonhydrostatic stress component with both MEW and He13; pressure-transmitting media in the pressure ranges that are well below the freezing pressure of the13; pressure-transmitting medium. A method to correct the measured d spacings for the nonhydrostatic13; pressure effect is suggested. This study clearly emphasizes the need to carefully analyze the data for13; the nonhydrostatic compression effects even if the experiments are performed with fluid13; pressure-transmitting medium.

Item Type:	Journal Article
Uncontrolled Keywords:	Applied physics;nonhydrostatic lattice strain;fluid pressure
Subjects:	CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Division/Department:	Materials Science Division, Other
Depositing User:	Ms Indrani V
Date Deposited:	27 May 2005
Last Modified:	24 May 2010 09:39
URI:	http://nal-ir.nal.res.in/id/eprint/772

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