Ali Sk Imran, Kremer Reinhard K, Johnsson Mats
Department of Materials and Environmental Chemistry, Stockholm University , SE-106 91 Stockholm, Sweden.
Max Planck Institute for Solid State Research , Heisenbergstrasse 1, D-70568 Stuttgart, Germany.
Inorg Chem. 2016 Nov 7;55(21):11490-11496. doi: 10.1021/acs.inorgchem.6b02031. Epub 2016 Oct 21.
The new quaternary layered oxide CoMoSbO was synthesized by hydrothermal synthesis techniques, and its structure was determined from single-crystal X-ray diffraction data. CoMoSbO crystallizes in the monoclinic space group C2/c with one Sb, Mo, and Co atom site per unit cell, respectively. The crystal structure contains building units consisting of [CoO], [MoO], and [SbO] chains. These are connected through corner sharing to form charge-neutral [CoMoSbO] layers. Thermal decomposition of CoMoSbO starts at 550 °C. The magnetic susceptibility follows a Curie-Weiss law above 50 K with a Curie constant of C = 3.46 emu·K·mol corresponding to an effective moment of μ = 5.26 μ per cobalt atom and a Curie-Weiss temperature θ = -13.2 K. Short-range anti-ferromagnetic ordering dominates below 5 K. Magnetic susceptibility and heat capacity data can be successfully modeled by the predictions from an Ising linear chain with an intrachain spin exchange of ca. -7.8 K.
采用水热合成技术合成了新型四元层状氧化物CoMoSbO，并通过单晶X射线衍射数据确定了其结构。CoMoSbO以单斜空间群C2/c结晶，每个晶胞分别含有一个Sb、Mo和Co原子位点。晶体结构包含由[CoO]、[MoO]和[SbO]链组成的结构单元。这些通过角共享连接形成电荷中性的[CoMoSbO]层。CoMoSbO的热分解在550℃开始。在50K以上，磁化率遵循居里-外斯定律，居里常数C = 3.46emu·K·mol，对应于每个钴原子的有效磁矩μ = 5.26μB，居里-外斯温度θ = -13.2K。在5K以下，短程反铁磁有序占主导。磁化率和热容数据可以通过具有约-7.8K链内自旋交换的伊辛线性链的预测成功建模。
