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Negative Thermal Expansion and Magnetic Transition in Anti-Perovskite Structured Mn3Zn1−xSnxN Compounds

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The thermal expansion properties of Mn3Zn1−xSnxN (x=0.1, 0.2, 0.3, 0.5, 0.8, 1.0) compounds were investigated by variable temperature X-ray powder diffraction. With increasing Sn content, the thermal expansion behavior of Mn3Zn1−xSnxN changes from positive to negative and returns to positive near the magnetic transition temperature range. Moreover, the magnetic transition temperature increases from 185 to 495 K. It is interesting that the abnormal thermal expansion behavior of Mn3Zn1−xSnxN is related to the number of valence electrons on Zn site and the equivalent effect with three valence electrons is beneficial for displaying negative thermal expansion. In addition, the antiferromagnetic order state gradually canted with the increasing Sn content due to the increase of Mn–Mn distance.
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Document Type: Research Article

Affiliations: 1: Department of Physics, Center for Condensed Matter and Materials Physics, Beihang University, Beijing 100191, China 2: Laboratory of Micro-nano Measurement, Manipulation and Physics (Ministry of Education), Beihang University, Beijing 100083, China 3: Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Publication date: August 1, 2010

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