Heat capacity and order-disorder phase transition in negative thermal expansion compound ZrW2O8

被引：27
作者：
Yamamura, Y
Tsuji, T
Saito, K
Sorai, M
机构：
[1] Japan Adv Inst Sci & Technol, Sch Mat Sci, Tatsunokuchi, Ishikawa 9231292, Japan
[2] Osaka Univ, Res Ctr Mol Thermodynam, Grad Sch Sci, Osaka 5600043, Japan
来源：
JOURNAL OF CHEMICAL THERMODYNAMICS | 2004年 / 36卷 / 06期
关键词：
negative thermal expansion; ZrW2O8; heat capacity; order-disorder phase transition; entropy of transition;
D O I：
10.1016/j.jct.2004.03.009
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Heat capacity of ZrW2O8 was measured in the (1.8 to 483) K temperature range by using two adiabatic and a commercial relaxation calorimeters. Standard thermodynamic functions of ZrW2O8 were estimated from the measured molar heat capacity. A large lambda-type anomaly of heat capacity due to an order-disorder phase transition was observed at T = (440 +/- 0.5) K. The enthalpy and entropy of phase transition were determined to be (1.56 +/- 0.01) kJ . mol(-1) and (4.09 +/- 0.03) J . K(-)1 . mol(-1), respectively. The magnitude of the entropy of transition supports the order-disorder mechanism previously suggested by the present authors. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：525 / 531
页数：7
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