THERMAL-BEHAVIOR OF SULFATES .9. MONOCRYSTAL STRUCTURAL REFINEMENT OF METAL(III) SULFATES CR2(SO4)3 AND AL2(SO4)3

被引：36
作者：
DAHMEN, T
GRUEHN, R
机构：
[1] Institut für anorganische und analytische Chemie der Justus-Liebig-Universität, D-6300 Gießen
来源：
ZEITSCHRIFT FUR KRISTALLOGRAPHIE | 1993年 / 204卷
关键词：
CHROME(III)-SULFATE; ALUMINUM(III)-SULFATE; CHEMICAL TRANSPORT; CRYSTAL STRUCTURES;
D O I：
10.1524/zkri.1993.204.Part-1.57
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Well shaped crystals of Cr2(SO4)3 and Al2(SO4)3 could be prepared by chemical transport reactions using HCI (Cr2(SO4)3) or SOCl2 (Al2(SO4)3) as transport agent. Cr2(SO4)3 and Al2(SO4)3 are isostructural to the rhombohedral modification of Fe2(SO4)3 and crystallize in the trigonal space group R -3 with a = 8.1245(7) (8.0246(4)) angstrom and c = 21.944(3) (21.357(1)) angstrom, Z = 6 (hexagonal setting). The crystal structures were refined to a residual R = 0.035 using 828 unique reflections with Absolute value of F greater-than-or-equal-to 3 sigma Absolute value of F for Cr2(SO4)3 and to R = 0.026 (772 unique reflections with Absolute value of F greater-than-or-equal-to 3 sigma Absolute value of F) for A12(SO4)3. Main building units of the two compounds are MO6-octahedra and SO4--tetrahedra which arc linked via common corners to a 3-dimensional network.
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页码：57 / 65
页数：9
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