ICMCB, CNRS, Université Bordeaux 1, 87 Avenue du Docteur Schweitzer, 33608 Pessac Cedex, France.
Inorg Chem. 2010 Sep 20;49(18):8578-82. doi: 10.1021/ic101180h.
A new ternary manganese vanadate, NaMnVO(4), was synthesized by solid state reaction route, and its crystal structure and magnetic properties were characterized by X-ray diffraction, magnetic susceptibility and specific heat measurements, and by density functional calculations. NaMnVO(4) crystallizes in the maricite-type structure with space group Pnma, a = 9.563(1) A, b = 6.882(1) A, c = 5.316(1) A, and Z = 4. NaMnVO(4) contains MnO(4) chains made up of edge-sharing MnO(6) octahedra, and these chains are interlinked by VO(4) tetrahedra. The magnetic susceptibility has a broad maximum at T(max) = 24 K and follows the Curie-Weiss behavior above 70 K with θ = -62 K. NaMnVO(4) undergoes a three-dimensional antiferromagnetic ordering at T(N) = 11.8 K. The spin exchanges of NaMnVO(4) are dominated by the intrachain antiferromagnetic exchange, and the interchain spin exchanges are spin-frustrated. The most probable magnetic structure of the ordered magnetic state below T(N) was predicted on the basis of the extracted spin exchanges.
一种新的三元锰钒酸盐 NaMnVO(4) 通过固态反应路线合成，并通过 X 射线衍射、磁化率和比热测量以及密度泛函计算对其晶体结构和磁性进行了表征。NaMnVO(4) 结晶为马里塞特型结构，空间群为 Pnma，a = 9.563(1) A，b = 6.882(1) A，c = 5.316(1) A，Z = 4。NaMnVO(4) 包含由共用边 MnO(6) 八面体组成的 MnO(4) 链，这些链通过 VO(4) 四面体相互连接。磁化率在 T(max) = 24 K 处有一个宽的最大值，并在 70 K 以上遵循居里-外斯行为，θ = -62 K。NaMnVO(4) 在 T(N) = 11.8 K 下经历三维反铁磁有序。NaMnVO(4) 的自旋交换主要由链内反铁磁交换主导，而链间自旋交换是自旋受挫的。根据提取的自旋交换，预测了低于 T(N)的有序磁态的最可能磁结构。
