Paper Title:
Order-Disorder Phase Transition in NaBD4
  Abstract

By means of neutron diffraction the low-temperature crystal structure of NaBD4 has been determined. At 10 K the lattice parameters are a = 4.332(1) Å and c = 5.869(1) Å. Deuterium is found in a tetrahedral arrangement [sites (8g)] around B. The symmetry corresponds to space group P42/nmc. For room temperature the structure model for NaBD4 of Davis and Kennard with disordered deuterium distributed over two sites has been revised to space group Fm-3 m. Thus the 190 K phase transition known from specific heat measurements is of order-disorder type, caused by reorientations of BD4 tetrahedra.

  Info
Periodical
Materials Science Forum (Volumes 443-444)
Edited by
Yvonne Andersson, Eric J. Mittemeijer and Udo Welzel
Pages
287-290
DOI
10.4028/www.scientific.net/MSF.443-444.287
Citation
P. Fischer, A. Züttel, "Order-Disorder Phase Transition in NaBD4", Materials Science Forum, Vols. 443-444, pp. 287-290, 2004
Online since
January 2004
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Katsunari Oikawa, Takashi Kamiyama, R. Kanno, Fujio Izumi, T. Ikeda, B.C. Chakoumakos
Abstract:The structure of a high ionic conductor Rb4Cu16I7.2Cl12.8 at low temperature has been...
337
Authors: M. Vennström, Y. Andersson
Abstract:Pd3P, which crystallises in the cementite, Fe3C-type structure, forms a solid solution with nickel. The crystal...
353
Authors: A.K.M. Zakaria, M.A. Asgar, S.-G. Eriksson, F.U. Ahmed, S.M. Yunus, A.K. Azad, Håkan Rundlöf
365
Authors: I.M. Siouris, I.P. Semitelou, J.K. Yakinthos, Wolfgang Schäfer
Abstract:Evidence of the coexistence of an ordered antiferromagnetic and a spin glass state is given by studying a polycrystalline...
391
Authors: Toshihiko Sasaki, Osama Yaguchi, Hiroshi Suzuki
Abstract:In this study, the authors investigated the application of the area detector for the purpose of evaluating residual stress in rails by means...
260