Crystal Structure and Magnetic Properties of Sm3ReO7
Crystal Structure and Magnetic Properties of Sm3ReO7
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Sm3ReO7 的晶体结构和磁性能
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
H. Fuess,
中科院分区：
文献类型：
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作者：
G. Wltschek;H. Paulus;I. Svoboda,;H. Ehrenberg;H. Fuess,
在1673 K下，通过三氧化二钐和二氧化三钐（1.5：1）在Pt-10 Rh密封管中的固相线下反应，得到了一种新的三元氧化钐晶体Sm 3ReO 7。通过单晶X射线衍射确定了其结构。Sm 3 ReO 7晶体属正交晶系，晶胞参数a = 10.736（5），B= 7.392（3），c = 7.519（3），空间群Cmcm（No.63），Z = 4。该结构由ReO 6八面体、SmO 6畸变八面体和SmO 8棱柱相互连接形成三维网络。铼的形式氧化态为+5，但在该化合物中没有观察到金属-金属键。在4 K <T< 52 K的温度范围内观察到的磁化强度用居里-外斯定律解释，该定律由钐（3+）的货车Vleck顺磁性与温度无关修正。
Crystals of a new ternary samarium rhenium oxide, Sm3ReO7were obtained by subsolidus reaction of samariumsesquioxide and rheniumdioxide (ratio 1.5:1) in sealed Pt–10Rh-tubes at 1673 K. The structure was determined by single-crystal X-ray diffraction. Sm3ReO7crystallizes in the orthorhombic system with unit cell dimensionsa= 10.736(5),b= 7.392(3), andc= 7.519(3) in space groupCmcm(No. 63) withZ= 4. The structure consists of ReO6octahedra, distorted SmO6octahedra, and SmO8prisms that are interconnected to each other to form a three-dimensional network. Rhenium has the formal oxidation state of +5 but no metal–metal bond is observed in this compound. The observed magnetization in the temperature range 4 K <T< 52 K is explained by a Curie–Weiss law modified by a temperature independent Van Vleck paramagnetism of samarium (3+).