Endo Takashi, Doi Yoshihiro, Wakeshima Makoto, Suzuki Keita, Matsuo Yasutaka, Tezuka Keitaro, Ohtsuki Takuya, Shan Yue Jin, Hinatsu Yukio
Research Division of Functional Materials Design, Graduate School of Engineering, Utsunomiya University , Utsunomiya 321-8585, Japan.
Inorg Chem. 2017 Mar 6;56(5):2459-2466. doi: 10.1021/acs.inorgchem.6b02505. Epub 2017 Feb 15.
The synthesis, crystal structures, photoluminescence, and magnetic properties of the melilite-type oxysulfide SrMnGeSO were investigated. This compound crystallizes in the melilite structure with space group P4̅2m, in which two kinds of anions, S and O, occupy different crystallographic sites in an ordered manner. The temperature dependence of the magnetic susceptibility of SrMnGeSO shows a broad peak due to a two-dimensional magnetic interaction between Mn ions in the ab plane. The specific heat data show that this compound has an antiferromagnetic transition temperature (T = 15.5 K) that is much higher than that of the oxide analogue SrMnGeO (T = 4.4 K). DFT calculations showed that the magnetic interaction is enhanced by covalency in the Mn-S bonding.
研究了黄长石型氧硫化物SrMnGeSO的合成、晶体结构、光致发光和磁性。该化合物结晶为空间群为P4̅2m的黄长石结构，其中两种阴离子S和O以有序方式占据不同的晶体学位置。SrMnGeSO的磁化率随温度的变化由于ab平面中Mn离子之间的二维磁相互作用而呈现出一个宽峰。比热数据表明，该化合物具有反铁磁转变温度（T = 15.5 K），远高于氧化物类似物SrMnGeO的转变温度（T = 4.4 K）。密度泛函理论计算表明，Mn-S键中的共价性增强了磁相互作用。
