Synthesis, Crystal Structure, and Physical Properties of Layered LnCrSe2O (Ln = Ce–Nd)
- Xian Zhang*Xian Zhang*E-mail: [email protected] (X.Z.).Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, P. R. ChinaMore by Xian Zhang,
- Yi XiaoYi XiaoState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Yi Xiao,
- Ruiqi WangRuiqi WangState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Ruiqi Wang,
- Jianqiao HeJianqiao HeCAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaMore by Jianqiao He,
- Dong WangDong WangCAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaMore by Dong Wang,
- Kejun BuKejun BuCAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaMore by Kejun Bu,
- Gang MuGang MuState Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, P. R. ChinaMore by Gang Mu, and
- Fuqiang Huang*Fuqiang Huang*E-mail: [email protected] (F.H.).State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaCAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaMore by Fuqiang Huang
Abstract
The layered oxyselenides with the formula LnCrSe2O (Ln = Ce–Nd) were synthesized via molten salt methods. The isostructural compounds crystallize in the monoclinic space group of C2/m. The crystal structures feature ∞2[CrSe2O]3– motifs stacked along the a axis, which are separated by Ln3+ ions. The ∞2[CrSe2O]3– layers are composed of [Cr1Se6]9– and [Cr2Se4O2]9– octahedra via corner and edge sharing. Powder X-ray diffraction results confirm the phase purities of the as-synthesized compounds. LnCrSe2O (Ln = Ce–Nd) show typical antiferromagnetic ordering with TN = 125, 120, and 118 K, respectively. Heat capacity measurement for NdCrSe2O indicates that the Debye temperature is 278.4 K. Similar metal-to-semiconductor phase transitions were observed for LnCrSe2O (Ln = Ce–Nd) plates with transition temperatures of 115, 109, and 95 K, respectively. NdCrSe2O also possesses a magnetoresistance effect at low temperature (<25 K) with a significant positive magnetoresistance ∼ 16% at 2 K and 1 T.