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フルテキストURL2008010259.pdf ( 249.4KB ) 公開日 2010-04-16
タイトルStructural determination of atomic substitution ratio in (K_<1-x>Rb_x)_2SeO_4 mixed crystal system
作成者Sawae, Shinsuke
Nakashima, Terumi
Shigematsu, Hirotake
Kasano, Hironobu
Mashiyama, Hiroyuki
作成者ヨミサワエ, シンスケ
ナカシマ, テルミ
シゲマツ, ヒロタケ
カサノ, ヒロノブ
マシヤマ, ヒロユキ
作成者別表記笠野, 裕修
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)In order to explain why Rb_2SeO_4 remains in normal phase down to 0 K while K_2SeO_4 transforms into the modulated phase at finite temperature, crystal structures of the mixed system have been refined at room temperature by X-ray single crystal analysis. Rb ion can be substituted for K ion with keeping the macroscopic symmetry of space group Pnam. Larger size of Rb ion occupies preferentially site 1, while smaller K ion prefers site 2. Here the atomic distance between an alkali ion and oxygen atoms is longer at site 1 than at site 2. The mean substitution ratio coincides with that from chemical analysis, however, the crystallographic structure analysis is only one method to determine the ratios at each site separately. A sublattice model is discussed to interpret the ion replacing effect on the phonon dispersion relation of the mixed crystal system. The hardening of the soft mode branch can be predicted by the change of interactions between the SeO_4 tetrahedrons if the alkali ions are replaced.
本文言語eng
著者キーワードpotassium selenate
rubidium selenate
mixed crystal
substitution ratio
structure analysis
phase transition
sublattice model
soft phonon dispersion
資料タイプtext
ファイル形式application/pdf
出版者The Physical Society of Japan
出版者ヨミニホン ブツリ ガッカイ
NII資料タイプ学術雑誌論文
査読の有無査読あり
ISSN0031-9015
NCIDAA00704814
掲載誌名Journal of the Physical Society of Japan
74
10
開始ページ2748
終了ページ2753
発行日2005
DOIinfo:doi/10.1143/JPSJ.74.2748
関連情報URL(IsPartOf)http://www.ipap.jp/jpsj/index.html
権利関係Copyright c (2002)The Physical Society of Japan
著者版/出版社版著者版
リポジトリID2008010259
地域区分山口大学
URIhttp://www.lib.yamaguchi-u.ac.jp/yunoca/handle/2008010259