Nanostructured Crystals of the Fluorite Phases Sr_(1-x)R_xF_(2+x)(R_Rare-Earth Elements) and Their Ordering: II. Crystal Structure of the Ordered Sr_4Lu_3F_(17) Phase

E. A. Sulyanova; V. N. Molchanov; I. A. Verin; S. N. Sulyanov; B. P. Sobolev

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Nanostructured Crystals of the Fluorite Phases Sr_(1-x)R_xF_(2+x)(R_Rare-Earth Elements) and Their Ordering: II. Crystal Structure of the Ordered Sr_4Lu_3F_(17) Phase

机译：萤石相Sr_（1-x）R_xF_（2 + x）（R_稀土元素）的纳米结构晶体及其顺序：II。有序Sr_4Lu_3F_（17）相的晶体结构

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The crystal structure of the ordered phase Sr_4Lu_3F_(17) prepared by directed crystallization of the melt has been investigated. The crystals have a trigonally distorted fluorite lattice (space group R3 , Z = 6, a = 10.615(2) _, c = 19.547(6) _). The Sr_4Lu_3F_(17) phase is isostructural to Ba_4R_3F_(17) (R = Y, Yb). The distortions of the fluorite cation sublattice manifest themselves in the splitting of the only mixed position (Sr, Lu) into three positions: Sr(1), Sr(2), and Lu. All Lu~(3+) atoms are displaced from the center of the [Sr_8{Lu_6F_(36+1)}F_(32)] octacu_bic cluster in the MO1]_(cub), direction, and the Sr(1) cations are displaced toward the center of the octacubic cluster in the [111]_(cub) direction. The coordination numbers of the Lu, Sr(1), and Sr(2) cations are 8, 10, and 11, respectively. The distortions of the fluorite anion sublattice are caused by the incorporation of additional anions into both the center of the octacubic cluster and the {F8) cubic holes outside the cluster.

机译：研究了通过熔体的定向结晶制备的有序相Sr_4Lu_3F_（17）的晶体结构。晶体具有三角形扭曲的萤石晶格（空间群R3，Z = 6，a = 10.615（2）_，c = 19.547（6）_）。 Sr_4Lu_3F_（17）相与Ba_4R_3F_（17）同构（R = Y，Yb）。萤石阳离子亚晶格的畸变表现为将唯一的混合位置（Sr，Lu）分为三个位置：Sr（1），Sr（2）和Lu。所有Lu〜（3+）原子都从MO1] _（cub），方向和Sr（1）阳离子的[Sr_8 {Lu_6F_（36 + 1）} F_（32）]八立方簇的中心位移沿[111] _（cub）方向朝向八角形群集的中心位移。 Lu，Sr（1）和Sr（2）阳离子的配位数分别为8、10和11。萤石阴离子亚晶格的畸变是由于将额外的阴离子结合到八边形簇的中心和簇外的{F8）立方孔中而引起的。

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《Crystallography reports》 |2009年第3期|共10页
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E. A. Sulyanova; V. N. Molchanov; I. A. Verin; S. N. Sulyanov; B. P. Sobolev;
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1. Nanostructured Crystals of the Fluorite Phases Sr_(1-x)R_xF_(2+x)(R_Rare-Earth Elements) and Their Ordering: II. Crystal Structure of the Ordered Sr_4Lu_3F_(17) Phase [J] . E. A. Sulyanova, V. N. Molchanov, I. A. Verin, Crystallography reports . 2009,第3期

机译：萤石相Sr_（1-x）R_xF_（2 + x）（R_稀土元素）的纳米结构晶体及其顺序：II。有序Sr_4Lu_3F_（17）相的晶体结构
2. Displacements in the Cationic Motif of Nonstoichiometric Fluorite Phases Ba_(1-x)R_xF_(2+x) as a Result of the Formation of {Ba_8[R_6F_(68-69)]} Clusters: II. The Ba_(1-x)R_xF_(2+x) (R = Er Yb, Lu; 0.1 < x < 0.3) Crystals [J] . A. M. Golubev, L. P. Otroshchenko, V. N. Molchanov, Crystallography reports . 2009,第3期

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Nanostructured Crystals of the Fluorite Phases Sr_(1-x)R_xF_(2+x)(R_Rare-Earth Elements) and Their Ordering: II. Crystal Structure of the Ordered Sr_4Lu_3F_(17) Phase

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