Effect of Microstructure Scale on Negative Thermal Expansion of Antiperovskite Manganese Nitride
来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第9期
论文作者:Zhonghua Sun Xiaoyan Song
文章页码:903 - 909
摘 要:The negative thermal expansion(NTE)properties of the antiperovskite manganese nitrides with micron-scale,submicron-scale and nanometer-scale microstructures,respectively,were investigated using the Mn3Cu0.5Ge0.5N composition as an example.It was discovered that the NTE start temperature,NTE operation temperature range and coefficient of NTE change obviously in a wide range with decreasing the grain size level of the microstructure.The mechanisms for the broadening of the NTE operation temperature range and the decrease in the absolute value of NTE coefficient were proposed based on the grain-size-dependence of the frustrated magnetic interactions and magnetic ordering.The present study indicates that the NTE properties of the antiperovskite manganese nitrides can be tailored by the control of the microstructure scale.
Zhonghua Sun1,2,Xiaoyan Song1
1. College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials,Education Ministry of China, Beijing University of Technology
摘 要:The negative thermal expansion(NTE)properties of the antiperovskite manganese nitrides with micron-scale,submicron-scale and nanometer-scale microstructures,respectively,were investigated using the Mn3Cu0.5Ge0.5N composition as an example.It was discovered that the NTE start temperature,NTE operation temperature range and coefficient of NTE change obviously in a wide range with decreasing the grain size level of the microstructure.The mechanisms for the broadening of the NTE operation temperature range and the decrease in the absolute value of NTE coefficient were proposed based on the grain-size-dependence of the frustrated magnetic interactions and magnetic ordering.The present study indicates that the NTE properties of the antiperovskite manganese nitrides can be tailored by the control of the microstructure scale.
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