Thermal expansion in the Burns-phase of barium titanate stannate |
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Authors: | Volkmar Mueller,Lothar Jä ger,Hans-Peter Abicht |
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Affiliation: | a Fachbereich Physik, Martin-Luther-Universität Halle, F.-Bach-Platz 6, D-06108 Halle, Germany b Fachbereich Chemie, Martin-Luther-Universität Halle, Kurt-Mothes-Str.2, D-06120 Halle, Germany |
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Abstract: | The thermal expansion ST has been measured in the system BaTi1−xSnxO3, 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 ST(T) has been observed at elevated temperatures This is related to thermally generated impurities and, below the Burns-temperature Td 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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Keywords: | 77.80.Bh 77.84.Dy 65.70.+y |
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