MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Determination of Standard Gibbs Energy of Formation of Al2Nd by Solution Calorimetry and Heat Capacity Measurement from Near Absolute Zero Kelvin
Hiroaki YamamotoMasao MorishitaMinoru Kusumoto
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2006 Volume 47 Issue 8 Pages 2044-2048

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Abstract

The thermodynamic properties of Al2Nd were investigated by calorimetry. The standard entropy of formation of Al2Nd at 298 K, ΔfS298o(Al2Nd), was determined from measuring the heat capacities, Cp, from near absolute zero (2 K) to 300 K by the relaxation method. The standard enthalpy of formation of Al2Nd at 298 K, ΔfH298o(Al2Nd), was determined by solution calorimetry in hydrochloric acid solution. The standard Gibbs energy of formation of Al2Nd at 298 K, ΔfG298o(Al2Nd), was determined from these data. The results were obtained as follows: ΔfS298o(Al2Nd)/J·K−1·mol−1 = −10.7±1.2, ΔfH298o(Al2Nd)/kJ·mol−1 = −105.03±27, and ΔfG298o(Al2Nd)/kJ·mol−1 = −101.85±27.

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© 2006 The Japan Institute of Metals and Materials
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