Specific Heat Anomaly of Lithium Sodium Niobate at Low Temperature

Chin. Phys. Lett.

1992, Vol. 9

Issue (8): 441-443 DOI:

Original Articles

Specific Heat Anomaly of Lithium Sodium Niobate at Low Temperature

ZHANG Peilin;ZHONG Weilie;ZHAO Shaoxiang;YANG Zhaohe*;CHEN Huanchu*;SONG Yongyuan*

Department of Physics, Shandong University, Jinan 250100 *Institute of Crystal Materials, Shandong University, Jinan 250100

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ZHANG Peilin, ZHONG Weilie, ZHAO Shaoxiang et al 1992 Chin. Phys. Lett. 9 441-443

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Abstract A differential scanning calorimetric (DSC) study of the crystal Li_0.02Na_0.98NbO₃ 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.

Keywords: 77.80.-e 65.40.-f

Published: 01 August 1992

PACS:	77.80.-e	(Ferroelectricity and antiferroelectricity)
	65.40.-f

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y1992/V9/I8/0441

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	ZHANG Peilin
	ZHONG Weilie
	ZHAO Shaoxiang
	YANG Zhaohe
	CHEN Huanchu
	SONG Yongyuan

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