| Synthesis and Crystal Structure of Nd_2Si_2O_7 in Low Temperature Form |
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| 引用本文： | CHI Li-Sheng ,CHEN Hua-Yang, DENG Shui-Quan,ZHUANG Hong-Hui, HUANG Jin-Shun(State Key Laboratory of Structural Chemistry,Fujian Institute of Research on theStructure of Matter,the Chinese Academy of Sciences,Fuzhou 350002,China). Synthesis and Crystal Structure of Nd_2Si_2O_7 in Low Temperature Form[J]. 结构化学, 1997, 0(3) |
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| 作者姓名： | CHI Li-Sheng CHEN Hua-Yang DENG Shui-Quan ZHUANG Hong-Hui HUANG Jin-Shun(State Key Laboratory of Structural Chemistry Fujian Institute of Research on theStructure of Matter the Chinese Academy of Sciences Fuzhou 350002 China) |
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| 作者单位： | State Key Laboratory of Structural Chemistry，Fujian Institute of Research on theStructure of Matter，the Chinese Academy of Sciences，Fuzhou 350002，China |
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| 摘 要： | 1INTRoDUCTIONAmongthesilicates,rareearthdisilicatesarespecialbecausetheyshowexten-sivepolymorphism"~".Theconfigurationof(Si,O,)doubletetrahedraisrelativelyrelatedtoperiodicityoftherareearthelectronicstructures,suchasvariationinionicsizeordiscontinuityinchemicalbondingproperties,andalsousefulfordiscussingthedegreeofd-pffbondinginsilicates.SmolinandShepelevhavesynthesizedhightem-peratureformofNd,Si,O,crystallizedinorthorhombicsystem"'.Werecent1yob-tainedlowtemperatureformofNd,Si,O,,which…
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Synthesis and Crystal Structure of Nd_2Si_2O_7 in Low Temperature Form |
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| CHI Li-Sheng ,CHEN Hua-Yang, DENG Shui-Quan,ZHUANG Hong-Hui, HUANG Jin-Shun. Synthesis and Crystal Structure of Nd_2Si_2O_7 in Low Temperature Form[J]. Chinese Journal of Structural Chemistry, 1997, 0(3) |
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| Authors: | CHI Li-Sheng CHEN Hua-Yang DENG Shui-Quan ZHUANG Hong-Hui HUANG Jin-Shun |
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| Abstract: | The title compound was obtained by high temperature solid state reaction and flux method. The crystal belongs to tetragonal system, space group P41, withcell dimensions a= 6. 738(2), c= 24. 532 (3) A, V= 1113. 8(3) A 3, Z= 8, Mr =456. 65, Dc= 5. 45 g/cm3, F(000) = 1632, μ= 189. 3 cm-1. R=0.052, Rw=0. 059.The structure consists of isolated Si2O7 double tetrahedra which are arranged in layersperpendicular to the c axis. Four crystallographically different rare earth atoms in oneunit cell are located on each side of the layers and connect the four nearest SiO4 tetrahedra to form a three-dimensional network structure. |
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| Keywords: | crystal structure rare earth disilicate |
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