The phase transformation and physical properties of the MnBi and Mn 1.08 Bi compounds
The phase transformation and physical properties of the MnBi and Mn 1.08 Bi compounds
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DOI：
10.1109/tmag.1974.1058367
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发表时间：
1974-09
影响因子：
2.1
通讯作者：
T. Chen;W. Stutius
中科院分区：
文献类型：
--
作者：
T. Chen;W. Stutius
用低温相（LTP）和高温相（HTP）的单晶样品在淬火状态（QHTP）下重新研究了铋化锰的相变和磁性。确定LTP和HTP是分别具有化学式MnBi和Mn 1.08 Bi的单独化合物。加热到628 K时的铁磁-顺磁转变和冷却到613 K时的顺磁-铁磁转变分别对应于MnBi → Mn1.08Bi + Bi和Mn1.08Bi → MnBi + Mn的相分解。这些转变的影响也进行了研究，在薄膜试样和薄膜中的每个阶段的分布进行了测定。从单晶获得的LTP，HTP和QHTP的磁性能进行了比较，从多晶样品或薄膜获得的以前的数据。对于QHTP单晶，在4 K下的饱和磁化强度Ms为3.04 μ B/Mn原子。这是LTP中86%的M。在300 K时，我们发现M s比以前报道的大1.8倍。QHTP的各向异性能K远大于LTP。
The phase transformation and magnetic properties of manganese bismuthide have been reinvestigated with single crystal samples of low temperature phase (LTP) and high temperature phase (HTP) in the quenched state (QHTP). It was established that the LTP and HTP are separate compounds with the chemical formulae MnBi and Mn 1.08 Bi respectively. The ferro-to-paramagnetic transition upon heating to 628 K and para-to-ferromagnetic transition upon cooling to 613 K correspond respectively to the phase decomposition of MnBi → Mn 1.08 Bi + Bi and Mn 1.08 Bi → MnBi + Mn. The effects of these transformations were also investigated in thin film specimens and the distribution of each phase in the thin films was determined. Magnetic properties of the LTP, HTP and QHTP obtained from the single crystals were compared to the previous data obtained from polycrystalline samples or thin films. For the QHTP single crystals, the saturation magnetization, M s , at 4 K is 3.04 μ B per Mn atom. This is 86% of the M s of the LTP. At 300 K we find M s to be 1.8 times larger than previously reported. The anisotropy energy K in the QHTP was found to be much larger than that of the LTP.