CRYSTAL-STRUCTURE REFINEMENT OF LITHIOPHORITE

被引：0
|
作者：
POST, JE
APPLEMAN, DE
机构：
来源：
AMERICAN MINERALOGIST | 1994年 / 79卷 / 3-4期
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D O I：
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中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
A single-crystal X-ray diffraction study of lithiophorite [(Al,Li)MnO2(OH)2] revealed that the structure is trigonal (R3mBAR), not monoclinic as previously reported, and yielded unit-cell parameters a = 2.9247(4), c = 28.169(6) angstrom. The study confirmed that the structure consists of alternately stacked layers of Mn-0 and (Al,Li)-OH octahedra. The refinement successfully revealed the H atom position. Structure energy calculations were used to assess the effects of various Al-Li ordering schemes on the H atom position. Precession photographs show weak superstructure reflections, corresponding to a primitive trigonal unit cell with a = 5.056 and c = 56.34 angstrom.
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页码：370 / 374
页数：5
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