Sr2Mn3Sb2O2 Type Oxyselenides: Structures, Magnetism, and Electronic Properties of Sr(2)AO(2)M(2)Se(2) (A=Co, Mn; M=Cu, Ag)

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	Sr2Mn3Sb2O2 Type Oxyselenides: Structures, Magnetism, and Electronic Properties of Sr(2)AO(2)M(2)Se(2) (A=Co, Mn; M=Cu, Ag)
	Jin, SF ; Chen, XL ; Guo, JG ; Lei, M ; Lin, JJ ; Xi, JG ; Wang, WJ ; Wang, WY
刊名	INORGANIC CHEMISTRY
	2012
卷号	51 期号:19 页码:10185
关键词	LAYERED OXYSULFIDES PHYSICAL-PROPERTIES OPTICAL-PROPERTIES CRYSTAL-STRUCTURES CUS LAYERS SR OXYCHALCOGENIDES CHEMISTRY SERIES ZN
ISSN号	0020-1669
通讯作者	Chen, XL (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Res & Dev Ctr Funct Crystals, Beijing 100190, Peoples R China.
中文摘要	Four new oxyselenides with nominal formula Sr(2)AO(2)M(2)Se(2) (A=Co, Mn; M=Cu, Ag) have been synthesized. They all crystallize in an I4/mmm space group and consist of alternating perovskite-like (Sr(2)AO(2))(2+) blocks and antiflourie (M2Se2)(2-) layers, which are relatively rare layered oxyselenides reported so far that are isostructural to Sr2Mn3Sb2O2. From powder X-ray diffraction data, compounds Sr2CoO2Cu2Se2 and Sr2CoO2Ag2Se2 are found near stoichiometric, whereas Sr2MnO2Cu2-delta Se2 and Sr2MnO2Ag2-delta Se2 possess substantial copper or silver vacancies (delta approximate to 0.5), consistent with their oxysulfide analogues. X-ray photoelectron spectroscopy measurements indicate the readily oxidization of Mn2+ ions should be responsible for the occurrence of Cu/Ag vacancies. The rigid (Sr(2)AO(2))(2+) blocks within these compounds constrain the basal lattice parameters in the ab plane and result in largely deformed tetrahedral sites for the large silver ions. Magnetic susceptibility measurements of Sr2CoO2M2Se2 (M=Cu, Ag) show complex antiferromagnetic transitions, while Sr2MnO2M2-delta Se2 (M=Cu, Ag) show high-temperature Curie-Weiss behavior, followed by low-temperature antiferromagnetic transitions at 54 K and 67 K, respectively. Except for Sr2MnO2Ag2-delta Se2, the other three compounds exhibit p-type semiconducting transport properties, with the measured resistivities several orders lower than their oxysulfide analogues. Hall measurement reveals high mobilities of Sr2CoO2M2Se2 (M=Cu, Ag) compounds at room temperature. The unusually small optical band gaps (similar to 0.07 eV) of Sr2CoO2Cu2Se2, Sr2CoO2Ag2Se2, and Sr2MnO2Cu2-delta Se2 are also reported.
收录类别	SCI
资助信息	National Science Foundation of China [90922037, 51072226]
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/52991]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Jin, SF,Chen, XL,Guo, JG,et al. Sr2Mn3Sb2O2 Type Oxyselenides: Structures, Magnetism, and Electronic Properties of Sr(2)AO(2)M(2)Se(2) (A=Co, Mn; M=Cu, Ag)[J]. INORGANIC CHEMISTRY,2012,51(19):10185.
APA	Jin, SF.,Chen, XL.,Guo, JG.,Lei, M.,Lin, JJ.,...&Wang, WY.(2012).Sr2Mn3Sb2O2 Type Oxyselenides: Structures, Magnetism, and Electronic Properties of Sr(2)AO(2)M(2)Se(2) (A=Co, Mn; M=Cu, Ag).INORGANIC CHEMISTRY,51(19),10185.
MLA	Jin, SF,et al."Sr2Mn3Sb2O2 Type Oxyselenides: Structures, Magnetism, and Electronic Properties of Sr(2)AO(2)M(2)Se(2) (A=Co, Mn; M=Cu, Ag)".INORGANIC CHEMISTRY 51.19(2012):10185.