Issue 2, 1999

Effect of temperature on cation disorder in ABi2Nb2O9 (A=Sr, Ba)

Abstract

The influence of thermal annealing on cation disorder in ABi 2 Nb 2 O 9 (A=Sr, Ba) has been studied using synchrotron powder X-ray diffraction methods. BaBi 2 Nb 2 O 9 adopts a tetragonal (I4 1 /mmm) structure, whilst SrBi 2 Nb 2 O 9 is orthorhombic, space group A2 1 am, irrespective of the annealing conditions. In both complexes the A-type cations, Sr and Ba, are disordered over the perovskite and Bi 2 O 2 layers. Quenching the samples from high temperature results in a slight increase in both the cell volume and the degree of disorder, the extent of disorder being greater in the Ba complex. Variable temperature diffraction studies are also reported.

Article information

Article type
Paper

J. Mater. Chem., 1999,9, 541-544

Effect of temperature on cation disorder in ABi2Nb2O9 (A=Sr, Ba)

B. J. Kennedy and I., J. Mater. Chem., 1999, 9, 541 DOI: 10.1039/A806760K

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