NEGATIVE THERMAL EXPANSION PHENOMENA\par OF Mn3(Cu1-xGexN

Acta Metall Sin

2009, Vol. 45

Issue (1): 97-101 DOI:

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NEGATIVE THERMAL EXPANSION PHENOMENA\par OF Mn₃(Cu_1-xGe_xN

ZHANG Congyang; ZHU Jie; ZHANG Maocai

State Key Laboratory of Advanced Metals and Materials; University of Science and Technology Beijing; Beijing 100083

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ZHANG Congyang ZHU Jie ZHANG Maocai. NEGATIVE THERMAL EXPANSION PHENOMENA\par OF Mn₃(Cu_1-xGe_xN. Acta Metall Sin, 2009, 45(1): 97-101.

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Abstract

The metallic nitrides Mn₃(Cu_1-xGe_x)N were prepared by solid-state sintering in the pure nitrogen atmosphere at 1073 K. The X-ray diffraction analysis shows that all of the sintered polycrystalline samples present an antiperovskite structure of Mn₃CuN phase. The linear thermal expansions of compounds Mn₃(Cu_1-xGe_x)N (0.40≦x≦0.60) measured by using Michelson interferometer, exhibited negative thermal expansion near Neel temperature. With increase in the content of Ge, the temperature at which the negative thermal expansion occurred increases while the temperature range widens, but the thermal expansion coefficient decreases. The sample with x=0.60 presents negative thermal expansion in the region of 250-290 K (around 273 K), the linear expansion coefficient can reach to -65×10^-6 K^-1, shows a potential for practical application. The temperature dependence of the magnetization indicates that the negative thermal expansion behavior of Mn₃(Cu_1-xGe_x)N compounds occurs in the gradual transition from antiferromagnetic to paramagnetic state. The negative thermal expansion is caused by magnetovolume effect, originating from magnetic spin order disappearance and magnetic moment decrease near the Neel temperature.

Key words: negative thermal expansion antiperovskite structure solid--state sintering magnetic transition

Received: 30 June 2008

ZTFLH:	TG113.22
	O614.7
	O613.61

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I1/97

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