Abstract
The in-plane thermal conductivity of Bi2WO6, SrBi2Ta2O9, and Bi4Ti3O12 single crystals has been measured from 2 to 320K. These compounds are representative members of the Aurivillius ferroelectrics having one, two, and three perovskite-like layered blocks in the structure, respectively. In contrast to Bi2WO6 and Bi4Ti3O12, SrBi2Ta2O9 has much lower glasslike thermal conductivity that is attributed to strong cation disorder in the crystal. Unlike glasses, however, SrBi2Ta2O9 does not exhibit a temperature-linear contribution in its heat capacity.
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