COMPARISON OF THE CRYSTAL-STRUCTURES OF GAMMA-BI2MOO6 AND BI2WO6

被引:26
作者
THOMPSON, JG
SCHMID, S
WITHERS, RL
RAE, AD
FITZ GERALD, JD
机构
[1] UNIV NEW S WALES, SCH CHEM, KENSINGTON, NSW 2033, AUSTRALIA
[2] AUSTRALIAN NATL UNIV, RES SCH EARTH SCI, CANBERRA, ACT 2601, AUSTRALIA
关键词
D O I
10.1016/0022-4596(92)90186-Y
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The crystal structure of γ-Bi2MoO6, koechlinite, is compared with the recently re-refined structure of Bi2WO6, russellite. Appropriate resetting of the atomic coordinates of γ-Bi2MoO6 showed the structures to be isomorphous. Symmetry decomposition of these structures shows the major displacive modes to be virtually identical. The magnitude and/or sign of some of the minor displacive modes, however, are not in agreement. The advantages of X-ray diffraction data over neutron powder data for the refinement of these minor modes are discussed. Transmission electron microscope evidence is presented for the existence of a minority B1a1 component coherently intergrown with the majority P21ab structure in γ-Bi2MoO6, as also observed in Bi2WO6. To obtain evidence of the recently reported structural phase transition in Bi2WO6 at ∼15°C, diffraction patterns and images of this material were recorded at low temperature. The coherent intergrowths were still found to occur at low temperature. © 1992.
引用
收藏
页码:309 / 321
页数:13
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