Abstract
The thermal expansion S T has been measured in the system BaTi 1− x Sn x O 3, both for the pure compositions x=0 (BT) and x=1 (BS), and for solid solutions 0.025≤ x≤0.2 (BTS). For all ceramics examined, a non-linear temperature dependence S T( T) has been observed at elevated temperatures T>400 K. This is related to thermally generated impurities and, below the Burns-temperature T d of BT and BTS, to the non-linear strain contribution of polar nanoregions. With increasing Sn-content x, a steep increase of the Burns-temperature is found in BTS for compositions x≥0.025.
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