Crystal structures of new gallo-borates MGa2B2O7, M = Sr, Ba

被引：18
|
作者：
Park, H [1 ]
Barbier, J [1 ]
机构：
[1] McMaster Univ, Dept Chem, Hamilton, ON L8S 4L8, Canada
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2000年 / 154卷 / 02期
关键词：
SrGa2B2O7; BaGa2B2O7; borates; pyroborates; gallo-borates; structure determination;
D O I：
10.1006/jssc.2000.8901
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Two new gallo-borates, MGa2B2O7 (M = Sr, Ba) have been synthesized and structurally characterized. The structure of SrGa2B2O7 (Cmcm, a = 11.7260(7) Angstrom, b = 8.3745(4) Angstrom, c = 5.7062(3) Angstrom, Z = 4) has been determined by single-crystal X-ray diffraction (wR(F-2) = 0.089 for 732 unique reflections). BaGa2B2O7 (Cmcm, a = 11.7434(6) Angstrom, b = 8.7076(4) Angstrom, c = 5.8038(3) Angstrom, Z = 4) has been shown to be isostructural by ab initio structure determination and Rietveld refinement using powder X-ray data (R-wp = 0.119, chi (2) = 2.16). The MGa2B2O7 structure, formulated as MGa2(B2O5)O-2, consists of a framework of corner-sharing tetrahedral (GaO4) chains and pyroborate (B2O5) groups with the M atoms filling eight-coordinated framework cavities, It represents a new structure-type for anhydrous berates and, in particular, is structurally distinct from the MAI(2)B(2)O(7) (M = Ca, Sr, Ba) alumino-borate analogs. (C) 2000 Academic Press.
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页码：598 / 602
页数：5
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