title: Syntheses and magnetic properties of new tellurite-sulfate compounds M2(TeO3)(SO4)·H2O (M = Co, Mn) with a layer structure showing a distorted honeycomb spin-lattice.
abstract: New tellurite-sulfate compounds M2(TeO3)(SO4)·H2O (M = Co, Mn) are synthesized by a conventional hydrothermal method. Two compounds are found to exhibit a similar structure, which both crystallize in the orthorhombic system of space group Pbcm. Te(4+) ions are coordinated by three O atoms, forming a quite distorted TeO3 trigonal pyramid with lone-pair electrons, while magnetic Co(2+) or Mn(2+) ions construct a wavelike layer with a distorted honeycomb spin-lattice. Magnetic measurements confirm that two isostructural compounds display different magnetic behaviors, in which Co2(TeO3)(SO4)·H2O shows a canted antiferromagnetic ordering at ∼15 K, while Mn2(TeO3)(SO4)·H2O shows a collinear antiferromagnetic ordering at ∼28 K. The nature of different magnetic behaviors between two isostructural compounds is also discussed.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou, Fujian 350002, P. R. China.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Tang
authors.forename: Zhangzhen
authors.initials: Z
authors.lastname: He
authors.forename: Wenbin
authors.initials: W
authors.lastname: Guo
authors.forename: Suyun
authors.initials: S
authors.lastname: Zhang
authors.forename: Ming
authors.initials: M
authors.lastname: Yang