Zhang Xian, Xiao Yi, Wang Ruiqi, He Jianqiao, Wang Dong, Bu Kejun, Mu Gang, Huang Fuqiang
Qian Xuesen Laboratory of Space Technology , China Academy of Space Technology , Beijing 100094 , P. R. China.
State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , P. R. China.
Inorg Chem. 2019 Jul 15;58(14):9482-9489. doi: 10.1021/acs.inorgchem.9b01364. Epub 2019 Jun 26.
The layered oxyselenides with the formula CrSeO ( = Ce-Nd) were synthesized via molten salt methods. The isostructural compounds crystallize in the monoclinic space group of 2/. The crystal structures feature [CrSeO] motifs stacked along the axis, which are separated by ions. The [CrSeO] layers are composed of [Cr1Se] and [Cr2SeO] octahedra via corner and edge sharing. Powder X-ray diffraction results confirm the phase purities of the as-synthesized compounds. CrSeO ( = Ce-Nd) show typical antiferromagnetic ordering with = 125, 120, and 118 K, respectively. Heat capacity measurement for NdCrSeO indicates that the Debye temperature is 278.4 K. Similar metal-to-semiconductor phase transitions were observed for CrSeO ( = Ce-Nd) plates with transition temperatures of 115, 109, and 95 K, respectively. NdCrSeO also possesses a magnetoresistance effect at low temperature (<25 K) with a significant positive magnetoresistance ∼ 16% at 2 K and 1 T.
通过熔盐法合成了通式为CrSeO（ = Ce - Nd）的层状氧硒化物。这些同构化合物在单斜空间群2/中结晶。晶体结构的特征是[CrSeO]基序沿 轴堆叠，由 离子隔开。[CrSeO]层由通过角和边共享的[Cr1Se]和[Cr2SeO]八面体组成。粉末X射线衍射结果证实了合成化合物的相纯度。CrSeO（ = Ce - Nd）分别在 = 125、120和118 K时表现出典型的反铁磁有序。对NdCrSeO的热容量测量表明德拜温度为278.4 K。对于CrSeO（ = Ce - Nd）板，观察到类似的金属 - 半导体相变，其转变温度分别为115、109和95 K。NdCrSeO在低温（<25 K）下也具有磁电阻效应，在2 K和1 T时具有显著的正磁电阻约16%。
