Some high-pressure X-ray diffraction studies using beryllium gasketing on a diffractometer with rotating anode X-ray source

Vohra, Y. K. ; Vijayakumar, V. ; Godwal, B. K. ; Sikka, S. K. ; Chidambaram, R. (1984) Some high-pressure X-ray diffraction studies using beryllium gasketing on a diffractometer with rotating anode X-ray source Review of Scientific Instruments, 55 (10). p. 1593. ISSN 0034-6748

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Official URL: http://rsi.aip.org/resource/1/rsinak/v55/i10/p1593...

Related URL: http://dx.doi.org/10.1063/1.1137623

Abstract

The beryllium gasketing technique is employed in a high-pressure (0-10 GPa) x-ray powder diffractometer using a NaI(T1) scintillation detector in conjunction with a high-brilliance rotating anode x-ray source. The beryllium gasket permits the use of a liquid pressure transmitting medium in the sample chamber giving rise to hydrostatic pressure conditions. This metal gasket also allows the use of softer Cu Kα radiation because of less absorption, thereby ensuring high resolution. The Be gasket is calibrated using sodium chloride and the equation of state (EOS) of strontium metal is measured up to 6 GPa using Cu Kα radiation in both the low-pressure (fcc) and high-pressure (bcc) phases. However, for high-Z samples like rare earths, Mo Kα radiation is employed to minimize absorption in the sample material. The high-pressure valence transition and the EOS of the rare earth alloy Ce0.92 La0.08 were studied up to 5.5 GPa. The γ→α transition in this cerium alloy is smeared out as compared to pure cerium metal.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Beryllium; Gaskets; Phase Transformations; X-Ray Diffractometers; Crystal Structure; Sodium Chlorides; Equations Of State; Strontium; Cerium Base Alloys; Lanthanum Additions; Phase Studies; X-Ray Diffraction Analysis
ID Code:86259
Deposited On:08 Mar 2012 11:27
Last Modified:12 Jul 2012 08:04

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