No. 20041 Deposited with http://cryst.instr.yamaguchi-u.ac.jp/20031
Journal: Journal of the Physical Society of Japan, Vol.73, No.4, pp.950-955
Title: X-Ray Scattering Study of High Temperature Phase Transition of Betaine Phosphate
Authors: *K. Hasebe, T. Asahi, T. Yoshida, Y. Kawamura, H. Mashiyama
Affiliation: Faculty of Science, Yamaguchi University, Yamaguchi 753-8512, Japan
and M. Maeda
Affiliation: Department of Electrical and Computer Engineering, Nagoya Institute of Technology, Nagoya 466-8512, Japan
(Published April 2004)
Abstract:
The I-II phase transition of betaine phosphate crystal associated with the ordering of PO4 groups has been studied by X-ray scattering. The observations are concerned on (1) the temperature dependence of lattice constants, (2) the temperature dependence of the order parameter of PO4 which followed the relation eta proportional to (Tc-T)beta, beta=0.42(1), and (3) the anisotropic distribution of critical diffuse scattering in the reciprocal space above Tc; elongated along the c-direction, shortened along the b*-direction. The critical X-ray diffuse scattering has been analyzed. The correlation lengths along three principal directions of anisotropic scattering distribution were estimated. The temperature dependence of the correlation length and staggered susceptibility were discussed.
Keywords: antiferrodistortive phase transition, order-disorder type, critical X-ray diffuse scattering, structure analysis, betaine phosphate
* Corresponding author, e-mail: hcc20@yamaguchi-u.ac.jp
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