Temperature variation of the Debye-Waller factors of Ba++ and F- ions in BaF2 powder by X-ray diffraction

Srinivasan, R. ; Girirajan, K. S. (1982) Temperature variation of the Debye-Waller factors of Ba++ and F- ions in BaF2 powder by X-ray diffraction Pramana - Journal of Physics, 19 (3). pp. 203-213. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/19/3/203-21...

Related URL: http://dx.doi.org/10.1007/BF02875462

Abstract

The temperature variation of the Debye-Waller factors of Ba++ and F- ions in BaF2 powder has been studied using x-ray powder diffraction over the temperature range 77°-298°K. A continuous flow cryostat has been specially fabricated for this purpose for the YPC 50 NM powder diffractometer available in the department. The Debye-Waller factors of Ba++ and F- between room temperature and 879°K have been measured using single crystal neutron diffraction by Cooperet al. Theoretical lattice dynamics shell model calculations using a 7-parameter model in a quasiharmonic approximation have been done over a temperature range 77° to 879°K. The theoretical values have been compared with the present x-ray measurements and the single crystal neutron diffraction values and the results are discussed.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Cryostat; Powder Diffraction; Debye-waller Factor; Lattice Dynamics; Barium Fluoride
ID Code:36584
Deposited On:12 Apr 2011 10:29
Last Modified:17 May 2016 19:32

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