具有刚玉相关结构的Ni_2InSbO_6和Ni_2ScSbO_6中的自旋和偶极有序
Spin and Dipole Ordering in Ni_2InSbO_6 and Ni_2ScSbO_6 with corundum-related structure
摘要：
采用固相反应法制备了多晶复合金属氧化物Ni_2InSbO_6（NISO）和Ni_2ScSbO_6（NSSO）。利用X射线衍射、中子粉末衍射、电子显微镜、量热法和磁性测量等手段对化合物的晶体结构和磁性进行了研究。该化合物采用三角形结构，空间群R3，与Ni3TeO6（NTO）类型相关。发现NTO结构的八面体Ni位置中只有一个（Ni（2））被In（Sc）占据。NTO具有非中心对称结构，在1000 K以下为铁电体，介电和二次谐波测量表明NISO和NSSO也是相应的铁电体。磁化强度测量表明反铁磁有序TN=60 K（NSSO）和76 K（NISO）以下。磁结构由两个反铁磁耦合的无公度螺旋形成，螺旋轴沿b轴，传播矢量k = [0，ky，0]，其中ky= 0.036（1）（NSSO）和ky= 0.029（1）（NISO）。讨论了NISO和NSSO的结构和磁性，并与NTO进行了比较。
英文摘要：
The complex metal oxides Ni2InSbO6 (NISO) and Ni2ScSbO6 (NSSO) have been prepared in form of polycrystalline powders by a solid state reaction route. The crystal structure and magnetic properties of the compounds were investigated using a combination of X-ray and neutron powder diffraction, electron microscopy, calorimetric and magnetic measurements. The compounds adopt a trigonal structure, space group R3, of the corundum related Ni3TeO6 (NTO) type. Only one of the octahedral Ni positions (Ni(2)) of the NTO structure was found to be occupied by In (Sc). NTO has non-centrosymmetric structure and is ferroelectric below 1000 K, dielectric and second harmonic measurements suggest that also NISO and NSSO are correspondingly ferroelectric. Magnetization measurements signified antiferromagnetic ordering below TN=60 K (NSSO) and 76 K (NISO). The magnetic structure is formed by two antiferromagnetically coupled incommensurate helices with the spiral axis along the b-axis and propagation vector k = [0, ky,0] with ky= 0.036(1) (NSSO) and ky= 0.029(1) (NISO). The observed structural and magnetic properties of NISO and NSSO are discussed and compared with those of NTO.
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