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フルテキストURL2008010366.pdf ( 407.5KB ) 公開日 2010-04-16
タイトルNeutron and X-ray scattering studies of structural phase transitions and soft modes in Rb_2ZnBr_4
作成者Shigematsu, H.
Mashiyama, H.
Oohara, Y.
Ohsima, K.
作成者ヨミマシヤマ, ヒロユキ
作成者別表記増山, 博行
作成者所属山口大学大学院理工学研究科(理学)
内容記述(抄録等)The low-temperature phase transitions of rubidium tetrabromozincate have been investigated with the use of neutron and X-ray scattering techniques to clarify the mechanism of the transitions and to determine the space groups of the low-temperature phases. The low-frequency excitations which soften at the phase transition T_3 = 112 K have been measured by the inelastic neutron scattering technique. On the other hand, no soft phonon mode which makes a contribution to the phase Ⅳ-to-Ⅴ transition at T_4 = 76 K has been observed. Both in phases Ⅳ and Ⅴ, superlatticereflections appear at the position (h)/(2) (k)/(2) (l)/(3), where the Miller indices h, k and l are referred to the lattice constants of phase Ⅰ. In phase Ⅴ, new Bragg reflections emerge at the positon hk0: h + k = 2n + 1 and increase continuously with decreasing temperature. The space groups are considered to be P11b with Z = 24 for phase Ⅳ and C1c1 with Z = 48 for phase Ⅴ according to general group theoretical considerations. Furthermore, structural models for phase Ⅳ are proposed to explain the extra extinction rule, the antiferroelectricity and other observed character of the crystal.
本文言語eng
資料タイプtext
ファイル形式application/pdf
出版者Institute of Physics
NII資料タイプ学術雑誌論文
査読の有無査読あり
ISSN0953-8984
NCIDAA10672168
掲載誌名Journal of physics. Condensed matter
10
26
開始ページ5861
終了ページ5874
発行日1998
DOIinfo:doi/10.1088/0953-8984/10/26/014
関連情報URL(IsPartOf)http://www.iop.org/EJ/journal/JPhysCM
著者版/出版社版著者版
リポジトリID2008010366
地域区分山口大学
URIhttp://www.lib.yamaguchi-u.ac.jp/yunoca/handle/2008010366