首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Crystal structure and magnetic properties of the novel hollandite Ba_(1.3)Co_(1.3)Ti_(6.7)O_(16)
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Crystal structure and magnetic properties of the novel hollandite Ba_(1.3)Co_(1.3)Ti_(6.7)O_(16)

机译:新型堇青石Ba_(1.3)Co_(1.3)Ti_(6.7)O_(16)的晶体结构和磁性

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摘要

Single crystals of the new barium hollandite Ba_(1.3)Co_(1.3)Ti_(6.7)O_(16) were obtained from a BaCl _2 flux (I2/m, Z = 1, a = 9.9470(4), b = 2.9714(2), c = 10.2260(5) ?, β = 90.906(2)°). In the crystal structure piles of Ba atoms are situated within a framework of edge-and vertex-sharing octahedra (Co,Ti)O_6. The composition was deduced from microprobe analyses, structure refinements and charge balance arguments in agreement with the observed magnetic properties. The temperature dependence of the magnetic susceptibility χ(T) of Ba_(1.3)Co_(1.3)Ti _(6.7)O_(16) single crystals reveals paramagnetism down to 2 K. The value of the Co magnetic moment deduced from the Curie-Weiss law agrees well with the theoretical value of the high-spin state spin-only moment of μ_(eff)= 3.87 μ_B for Co~(2+) (S = 3/2).
机译:从BaCl _2助熔剂(I2 / m,Z = 1,a = 9.9470(4),b = 2.9714(b)获得新钡铁锌矿Ba_(1.3)Co_(1.3)Ti_(6.7)O_(16)的单晶。 2),c = 10.2260(5)°,β= 90.906(2)°)。在晶体结构中,Ba原子堆位于边缘和顶点共享八面体(Co,Ti)O_6的框架内。由微探针分析,结构改进和电荷平衡论证推导得出与观察到的磁性能一致的组成。 Ba_(1.3)Co_(1.3)Ti _(6.7)O_(16)单晶的磁化率χ(T)与温度的关系揭示了低至2 K的顺磁性。从居里方程推导出的Co磁矩的值韦斯定律与Co〜(2+)(S = 3/2)的高自旋态自旋矩μ_(eff)= 3.87μ_B的理论值非常吻合。

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