Sato Mineo, Ishigaki Tadashi, Uematsu Kazuyoshi, Toda Kenji, Okawa Hirokazu
Acta Crystallogr Sect E Struct Rep Online. 2012 Sep 1;68(Pt 9):i68-i69. doi: 10.1107/S1600536812035040. Epub 2012 Aug 15.
Crystals of dilithium manganese(II) silicate were grown under high-temperature hydro-thermal conditions in the system LiOH-MnO(2)-SiO(2). The title compound crystallizes in the β(II)-Li(3)PO(4) structure type. The coordination polyhedra of all cations are slightly distorted tetra-hedra (m symmetry for MnO(4) and SiO(4)), which are linked by corner-sharing to each other. The vertices of the tetra-hedra point to the same direction perpendicular to the distorted hexa-gonal close-packed (hcp) array of O atoms within which half of the tetra-hedral voids are occupied by cations. In comparison with the previous refinement from powder X-ray data [Dominko et al. (2006 ▶). Electrochem. Commun.8, 217-222], the present reinvestigation from single-crystal X-ray data allows a more precise determination of the distribution of the Li(+) and Mn(2+) cations, giving a perfectly site-ordered structure model for both Li(+) and Mn(2+).
在LiOH-MnO₂-SiO₂体系中，通过高温水热条件生长出硅酸二锂锰（II）晶体。标题化合物结晶为β（II）-Li₃PO₄结构类型。所有阳离子的配位多面体均为稍有畸变的四面体（MnO₄和SiO₄为m对称），它们通过共角相连。四面体的顶点指向与畸变的六方密堆积（hcp）O原子阵列垂直的同一方向，其中一半的四面体空隙被阳离子占据。与之前基于粉末X射线数据的精修结果[多米科等人（2006年▶）。电化学通讯8，217 - 222]相比，本次基于单晶X射线数据的重新研究能够更精确地确定Li⁺和Mn²⁺阳离子的分布，从而给出Li⁺和Mn²⁺的完美有序结构模型。
