PB-6(ASO4)[B(ASO4)(4)] - A NEW CRYSTAL-ST RUCTURE TYPE IN THE SYSTEM PBO B2O3/AS2O5 WITH REMARKS ABOUT PB(BASO5)/

Authors
PARK CH BLUHM K
Citation
Ch. Park et K. Bluhm, PB-6(ASO4)[B(ASO4)(4)] - A NEW CRYSTAL-ST RUCTURE TYPE IN THE SYSTEM PBO B2O3/AS2O5 WITH REMARKS ABOUT PB(BASO5)/, Zeitschrift fur Naturforschung. B, A journal of chemical sciences, 51(3), 1996, pp. 313-318
Citations number
22
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Inorganic & Nuclear
Journal title
Zeitschrift fur Naturforschung. B, A journal of chemical sciences → ACNP
ISSN journal
09320776
Volume
51
Issue
3
Year of publication
1996
Pages
313 - 318
Database
ISI
SICI code
0932-0776(1996)51:3<313:P-ANCR>2.0.ZU;2-E
Abstract
Single crystals of Pb-6(AsO4)[B(AsO4)(4)] (I) and Pb(BAsO5) (II) were obtained by melting B2O3, As2O5 and PbO at 800 degrees C. X-ray invest igation led to the space group (I): S-4(1)-P (4) over bar (Nr.81) with a = 715.4(1), c = 976.2(3) pm, Z = 1 and (II): C: P3(2) (Nr. 144) wit h a = 712.2(1), c = 693.5(2) pm, Z = 3. While (II) is isotypic to the Stillwellite structure, Pb-6(AsO4)[B(AsO4)(4)] represents a completely novel type of crystal structure. Boron and arsenic are tetrahedrally coordinated by oxygen. These polyhedra form two kinds of isolated anio ns: AsO43- and B(AsO4)(4)(9-). Lead is eightfold coordinated by oxygen .