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タイトルMonoclinic-orthorhombic phase transitions in A_2BX_4 single crystals with Sr_2GeS_4-type structure
作成者Kasano, H.
Kojima, M.
Shouji, T.
Mashiyama, H.
作成者ヨミカサノ, 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)The structural phase transitions including the monoclinic-orthorhombic transition (α-β transition) in K_2ZnI_4, Rb_2CoI_4 and Rb_2MnI_4 are investigated by means of X-ray diffraction. These compounds take the Sr_2GeS_4-type structure at room temperature. In Rb_2CoI_4 and Rb_2MnI_4, the α-modification is transformed to the β-modification (β-K_2SO_4-type structure) at 515 K and 510 K, respectively. In the β-modification of Rb_2MnI_4, it is found that the transition from the normal phase (space group Pmcn) to incommensurate one (modulation along c^*) takes place at around 520 K. On the other hand, the α-β transition is not observed up to the melting point in K_2ZnI_4. We discuss the α-β transition on the basis of the ratio the ionic radius of A^+ to the average bond length B-X in tetrahedral BX_4^<2-> ion. It is found that the compounds in this family are classified into three types by the ratio.
本文言語eng
著者キーワードX-ray diffraction
Sr_2GeS_4-type structure
β-K_2SO_4-type structure
α-β transition
資料タイプtext
出版者Taylor and Francis
NII資料タイプ学術雑誌論文
査読の有無査読あり
ISSN0015-0193
NCIDAA00644949
掲載誌名Ferroelectrics
169
1
開始ページ149
終了ページ158
発行日1995
DOIinfo:doi/10.1080/00150199508217325
関連情報URL(IsPartOf)http://www.tandf.co.uk/journals/titles/00150193.asp
著者版/出版社版その他
リポジトリID2008010253
地域区分山口大学
URIhttp://www.lib.yamaguchi-u.ac.jp/yunoca/handle/2008010253