Abstract
The slopes of tan δ for voltage and the initial tan δ of barium-titanate ceramics, which were fired at three different temperatures has been measured in the temperature range from 150°C to -183°C. It was shown that below the Curie point the voltage region, where the values of initial tan δ did not change, were larger and the slopes of tan δ smaller, the higher the firing temperatures. Temperature dependence of the voltage region giving constant tan δ show three remarkable knicks corresponding to the phase changes of the crystals.
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