High-Pressure Synthesis and Ferrimagnetism of Ni 3 TeO 6 -Type Mn 2 ScMO 6 (M = Nb, Ta)
High-Pressure Synthesis and Ferrimagnetism of Ni 3 TeO 6 -Type Mn 2 ScMO 6 (M = Nb, Ta)
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Ni 3 TeO 6 型Mn 2 ScMO 6 (M = Nb, Ta)的高压合成及其亚铁磁性
DOI：
10.1021/acs.inorgchem.9b02468
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发表时间：
2019
影响因子：
4.6
通讯作者：
Tyson, Trevor A.
中科院分区：
文献类型：
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作者：
Feng, Hai L.;Deng, Zheng;Croft, Mark;Lapidus, Saul H.;Zu, Rui;Gopalan, Venkatraman;Grams, Christoph P.;Hemberger, Joachim;Liu, Sizhan;Tyson, Trevor A.
在高压高温(6 GPa1475K)下合成了刚玉相关氧化物Mn2ScNbO6和Mn2ScTaO6。同步辐射粉末X射线衍射分析表明，Mn2ScNbO6和Mn2ScTaO6为空间群为R3的Ni3TeO6型非中心对称晶体结构。通过二次谐波测量证实了晶体结构的非对称性。X射线吸收近边光谱表明了Mn2+2Sc3+Nb5+O6和Mn2+2Sc3+Ta5+O6的形式价态，这也得到了计算的键价和的支持。这两个样品都是电绝缘的。磁性测量表明，Mn2ScNbO6和Mn2ScTaO6在53 K和50K时分别具有亚铁磁性，并且发现Mn2ScTaO6发生了场感应磁转变。
The corundum-related oxides Mn2ScNbO6and Mn2ScTaO6were synthesized at high pressure and high temperature (6 GPa and 1475 K). Analysis of the synchrotron powder X-ray diffraction shows that Mn2ScNbO6and Mn2ScTaO6crystallize in Ni3TeO6-type noncentrosymmetric crystal structures with space groupR3. The asymmetric crystal structure was confirmed by second harmonic generation measurement. X-ray absorption near-edge spectroscopies indicate formal valence states of Mn2+2Sc3+Nb5+O6and Mn2+2Sc3+Ta5+O6, also supported by the calculated bond valence sums. Both samples are electrically insulating. Magnetic measurements indicate that Mn2ScNbO6and Mn2ScTaO6order ferrimagnetically at 53 and 50 K, respectively, and Mn2ScTaO6is found to have a field-induced magnetic transition.