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The electric permittivity of ceramic NaNbO 3 : x Mn (x=0-1 wt.%) was measured in the range 20-500 degrees C. The Mn dopant induces an additional anomaly in the epsilon (T). The temperature of the maxima in epsilon (T) is shifted under applied axial pressure. The X-ray test proved that the anomalies in epsilon (T) are related to the structural phase transitions.
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Molak et al. (1994) studied this question.
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