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Ba4Mg[Si2N6], Ba3Ca2[Si2N6] and Ba1.6Sr3.4[Si2N6] - Quaternary barium alkaline-earth silicon nitrides containing isolated nitridosilicate anions of [Si2N6]10-

被引：16
|
作者：
Yamane, Hisanori [1 ]
Morito, Haruhiko [1 ]
机构：
[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 555卷
关键词：
Nitridosilicates; Single crystal; Na flux; X-ray diffraction; Nitride materials; Crystal structure; CRYSTAL-STRUCTURE; TETRAHEDRA; MG;
D O I：
10.1016/j.jallcom.2012.12.039
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ba4Mg[Si2N6], Ba3Ca2[Si2N6], and Ba1.6Sr3.4[Si2N6] were synthesized by heating Ba, AE (=Mg, Ca, and Sr), Si, NaN3 and Na at 900 degrees C. The crystal structures of these compounds consist of alkaline-earth metal cations and edge-sharing SiN4 tetrahedra of isolated nitridosilicate anions [Si2N6](10-). Ba4Mg[Si2N6] crystallizes in a new orthorhombic structure type, space group Fddd (No. 70-2), a = 7.9095(3) angstrom, b = 11.2972(5) angstrom, c = 20.4009(12) angstrom, and Z = 8. Mg2+ cations are planar-rectangularly coordinated by four nitrogen atoms. The monoclinic crystal structures (C2/c (No. 15), Z = 4) of Ba3Ca2[Si2N6] (a = 10.0962(4) angstrom, b = 6.7868(3) angstrom, c = 13.3249(5) angstrom, beta = 101.7070(13)degrees) and Ba1.6Sr3.4[Si2N6] (a = 10.2406(5) angstrom, b = 6.6715(3) angstrom, c = 13.5166(8) angstrom, beta = 100.274(2)degrees) are isotypic with Ca-5[Si2N6]. (C) 2012 Elsevier B.V. All rights reserved.
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页码：320 / 324
页数：5
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