Syntheses, thermal stability, and structure determination of the novel isostructural RBa3B9O18 (R = Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) - 文章详情页

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摘要：

A　novel　borate　compound　YBa3B9O18　has　crystallized　in　a　melt　of　BaYB9O16.　Single-crystal　X-ray　diffraction　measurements　reveal　that　YBa3B9O18　adopts　a　hexagonal　space　group　P63/m　with　cell　parameters　of　a　=　7.1761(6)　Å　and　c　=　16.9657(6)　Å.　The　structure　is　made　up　of　the　planar　B3O6　groups　parallel　to　each　other　along　the　(001)　direction,　regular　YO6　octahedra,　and　irregular　BaO6　and　BaO9　polyhedra　to　form　an　analogue　structure　of　β-BaB　2O4.　A　series　of　isostructural　borate　compounds　RBa　3B9O18　(R　=　Y,　Pr,　Nd,　Sm,　Eu,　Gd,　Tb,　Dy,　Ho,　Er,　Tm,　Yb)　were　prepared　by　powder　solid-state　reactions.　The　DTA　and　TGA　curves　of　YBaB9O16　show　an　obvious　weight　loss　at　about　955　°C　associated　with　a　decomposition　into　YBO3,　B　2O3,　and　YBa3B9O18　due　to　its　incongruent　melting　behavior.　The　DTA　and　TGA　curves　of　YBa　3B9O18　show　that　it　is　chemically　stable　and　a　congruent　melting　compound.　A　comparison　of　the　structures　of　YBa　3B9O18　and　β-BaB2O4　is　presented.

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作者机构：

[ 1 ] [Li, X.Z.]Nanoscale Physics and Device Lab., Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China
[ 2 ] [Wang, C.]Department of Applied Chemistry, Beijing University of Technology, Beijing 100022, China
[ 3 ] [Chen, X.L.]Nanoscale Physics and Device Lab., Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China
[ 4 ] [Li, H.]Nanoscale Physics and Device Lab., Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China
[ 5 ] [Jia, L.S.]Nanoscale Physics and Device Lab., Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China
[ 6 ] [Wu, L.]Nanoscale Physics and Device Lab., Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China
[ 7 ] [Du, Y.X.]Nanoscale Physics and Device Lab., Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China
[ 8 ] [Xu, Y.P.]Nanoscale Physics and Device Lab., Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China

通讯作者信息：

[Chen, X.L.]Nanoscale Physics and Device Lab., Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China

电子邮件地址：

xlchen@aphy.iphy.ac.cn

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