Thermodynamics of the formation of magnesium–zinc intermetallic compounds in the temperature range from absolute zero to high temperature
详细信息 查看全文
- 作者：Masao Morishita ; Hiroaki Yamamoto ; Shinichi Shikada ; Minoru Kusumoto and Yasutomo Matsumoto
- 关键词：Mg– ; Zn binary compounds ; Calorimetry ; Heat capacity ; Gibbs energy of formation
- 刊名：Acta Materialia
- 出版年：2006
- 出版时间：June 2006
- 年：2006
- 卷：54
- 期：11
- 页码：3151-3159
- 全文大小：293 K
文摘
The standard Gibbs energies of formation of Mg–Zn binary compounds in the temperature range from near absolute zero to high temperature were determined by calorimetry for the first time. Their heat capacities (Cp) from near absolute zero (2 K) to high temperature were measured by the relaxation method and differential scanning calorimetry. Their values were determined by combining the Cp data with the standard enthalpies of formation at 298 K which were previously determined by solution calorimetry in hydrochloric acid solution. From near absolute zero to 300 K, the values increase monotonically, and then above 300 K they can be evaluated as a linear function of temperature as follows (in kJ mol−1):
. The results obtained are expected to be useful as basic thermodynamic data for Mg-based alloys.