Crystal structure and ionic conductivity of the series A2Bi24Mo8X2O68 (A = Ca, Sr and Ba and X = Cr and W) in the Bi2O3−MoO3 system

A series of A2Bi24Mo8X2O68 compounds, Ca2Bi24Mo8Cr2O68 (CBMC), Sr2Bi24Mo8Cr2O68 (SBMC), Pb2Bi24Mo8Cr2O68 (PBMC) and Ba2Bi24Mo8W2O68 (BBMW) have been synthesized by the solid-state method and characterized by single crystal X-ray diffraction. The compounds index into the monoclinic P2/c system with a...

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Bibliographic Details
Published in:Structural chemistry 2007-04, Vol.18 (2), p.195-202
Main Authors: Muktha, B., Guru Row, T. N.
Format: Article
Language:English
Subjects:
Bismuth oxides
Bismuth trioxide
Chromium
Crystal structure
Crystals
Ion currents
Ions
Molybdenum
Single crystals
Tetrahedra
Tungsten compounds
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Summary:A series of A2Bi24Mo8X2O68 compounds, Ca2Bi24Mo8Cr2O68 (CBMC), Sr2Bi24Mo8Cr2O68 (SBMC), Pb2Bi24Mo8Cr2O68 (PBMC) and Ba2Bi24Mo8W2O68 (BBMW) have been synthesized by the solid-state method and characterized by single crystal X-ray diffraction. The compounds index into the monoclinic P2/c system with a=11.687(4) Å, 5.784(2) Å, 24.728(9) Å, 101.911(6)°, Z=1; 11.673(6) Å, 5.775(3) Å, 24.670(2) Å, 101.757(8)°, Z=1; 11.638(3) Å, 5.790(1) Å, 24.655(6) Å, 101.716(4)°, Z=1 and 11.718(6) Å, 5.818(3) Å, 24.716(12) Å, 101.835(9)°, Z=1 for CBMC, SBMC, PBMC and BBMW, respectively. The structures were solved by direct methods and refined to R indices of 0.081, 0.065, 0.080 and 0.079 respectively. These compounds are isostructural with Bi26Mo10O69 and the structure consists of columns of [Bi12O14] along the b-axis, surrounded by Mo/Cr/WO4 tetrahedra. a.c. impedance studies indicate higher values of ionic conductivity for the tungsten-substituted compounds.
ISSN:1040-0400
1572-9001
DOI:10.1007/s11224-006-9093-2