SYNTHESIS AND CRYSTAL-STRUCTURE OF ZINC B ORATE OXIDES CONTAINING ISOLATED TRIGONAL PLANAR BO3 UNITS - ZN5MN(BO3)(2)O-4 AND ZNFE(BO3)O

Authors
Citation
S. Busche et K. Bluhm, SYNTHESIS AND CRYSTAL-STRUCTURE OF ZINC B ORATE OXIDES CONTAINING ISOLATED TRIGONAL PLANAR BO3 UNITS - ZN5MN(BO3)(2)O-4 AND ZNFE(BO3)O, Zeitschrift fur Naturforschung. B, A journal of chemical sciences, 50(10), 1995, pp. 1450-1454
Citations number
21
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Inorganic & Nuclear
ISSN journal
09320776
Volume
50
Issue
10
Year of publication
1995
Pages
1450 - 1454
Database
ISI
SICI code
0932-0776(1995)50:10<1450:SACOZB>2.0.ZU;2-Q
Abstract
Single crystals of the new compounds Zn5Mn(BO3)(2)O-4 (A) and ZnFe(BO3 )O (B) were prepared by using a B2O3 flux technique. Zn5Mn(BO3)(2)O-4 is isostructural with Ni5Ti(BO3)(2)O-4 and ZnFe(BO3)O is isotypic with the mineral warwickite. X-ray investigations on single crystals led t o (A) space group D-2h(9)-Pbam, a = 926.41(10), b = 1236.67(8), c = 30 4.55(3) pm, Z = 2, and (B) space group D-2h(16)-Pnma, a = 924.62(4), b = 314.1(10), c = 935.3(2) pm, Z = 4. The structure of Zn5Mn(BO3)(2)O- 4 (A) contains four octahedrally coordinated metal sites, one of these statistically occupied by Zn2+ and Mn4+. In the structure of ZnFe(BO3 )O the ions Zn2+ and Fe3+ occupy statistically both distorted octahedr al sites. Both structures contain isolated BO3 units and oxygen that i s not coordinated to boron.