Specific Heat Anomaly of Lithium Sodium Niobate at Low Temperature
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Abstract
A differential scanning calorimetric (DSC) study of the crystal Li0.02Na0.98NbO3 was carried out in the temperature range from 120 to 300K. The specific heat changes anomalously at about 180K on cooling and about 260K on heating, implying a first order phase transition. The heat of transition ΔQ=(212±50)J/mol and the corresponding change in entropy AS=0.82J/mol.K. The thermal hysteresis of this transition is about 80K, in agreement with that previously obtained from the dielectric and pyroelectric measurements.
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ZHANG Peilin, ZHONG Weilie, ZHAO Shaoxiang, YANG Zhaohe, CHEN Huanchu, SONG Yongyuan. Specific Heat Anomaly of Lithium Sodium Niobate at Low Temperature[J]. Chin. Phys. Lett., 1992, 9(8): 441-443.
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ZHANG Peilin, ZHONG Weilie, ZHAO Shaoxiang, YANG Zhaohe, CHEN Huanchu, SONG Yongyuan. Specific Heat Anomaly of Lithium Sodium Niobate at Low Temperature[J]. Chin. Phys. Lett., 1992, 9(8): 441-443.
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ZHANG Peilin, ZHONG Weilie, ZHAO Shaoxiang, YANG Zhaohe, CHEN Huanchu, SONG Yongyuan. Specific Heat Anomaly of Lithium Sodium Niobate at Low Temperature[J]. Chin. Phys. Lett., 1992, 9(8): 441-443.
|
ZHANG Peilin, ZHONG Weilie, ZHAO Shaoxiang, YANG Zhaohe, CHEN Huanchu, SONG Yongyuan. Specific Heat Anomaly of Lithium Sodium Niobate at Low Temperature[J]. Chin. Phys. Lett., 1992, 9(8): 441-443.
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