2(SeO 3)(Te 3O 7) (M?=?Co 2+, Ni 2+)]]>

摘要

AbstractNovel mixed-anionic-group compounds M2(SeO3)(Te3O7) (M?=?Co2+, Ni2+) are successfully synthesized by a conventional hydrothermal method. Two compounds are isostructural which crystallize in the orthorhombic system of a space groupPnma. The framework shows a (MO6)∞chain structure along theb-axis, while SeO3groups are isolated and Te3O7groups form the (Te3O7)∞chains running along thea-axis. This is the first time to realize transition-metal compounds coexisting with Se4+and Te4+anionic groups. Magnetic measurements show that Co2(SeO3)(Te3O7) possesses an antiferromagnetic ordering at ～11?K, while Ni2(SeO3)(Te3O7) exhibits a similar antiferromagnetic ordering at ～31?K. Also, the fitting of magnetic susceptibility using a spin-chain model gives the exchange couplingJ/kB?=??1.515?K for Co2(SeO3)(Te3O7) andJ/kB?=??8.963?K for Ni2(SeO3)(Te3O7), respectively.Graphical abstractDisplay OmittedHighlights?Two new compounds M2(SeO3)(Te3O7) (M?=?Co and Ni) were synthesized by a conventional hydrothermal method.?The compounds exhibit a linear spin chain structure.?The first transition-metal compounds coexist with Se4+and Te4+anionic groups.]]>