Broad negative thermal expansion operation-temperature window in antiperovskite manganese nitride with small crystallites
crystallite size, negative thermal expansion, magnetic transition, antiperovskite manganese nitride
Using spark plasma sintering (SPS), Mn3Cu0.6Ge0.4N crystallites have been fabricated with different crystallite sizes, and their magnetic properties and thermal behaviors were systemically investigated. With decreasing crystallite size, the magnetic transition becomes increasingly slow, accompanied by broadening of the negative thermal expansion (NTE) operation-temperature window. The NTE operation-temperature window for the 12-nm crystallite sample reaches at 140 K, which is about 75% larger than that of the 74-nm crystallite sample. The magnetic properties and NTE operation-temperature window can be tuned by varying the crystallite size. This discovery will promote an even wider range of practical applications in precision devices.
Tsinghua University Press
Jie Tan,Rongjin Huang,Wei Wang,Wen Li,Yuqiang Zhao,Shaopeng Li,Yemao Han,Chuanjun Huang,Laifeng Li, Broad negative thermal expansion operation-temperature window in antiperovskite manganese nitride with small crystallites. NanoRes.2015, 8(7): 2302–2307