Magnetic and crystallographic properties of spinels of the type AxB2S4 where A = Al, Ga, and B = Mo, V, Cr
Magnetic and crystallographic properties of spinels of the type AxB2S4 where A = Al, Ga, and B = Mo, V, Cr
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AxB2S4 型尖晶石的磁性和晶体学特性，其中 A = Al、Ga，B = Mo、V、Cr
DOI：
10.1016/0022-4596(75)90141-3
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发表时间：
1975
影响因子：
3.3
通讯作者：
X. J. Pinder
中科院分区：
文献类型：
--
作者：
D. Brasen;J. Vandenberg;M. Robbins;R. Willens;W. Reed;R. Sherwood;X. J. Pinder
制备了通式为Ga_（0.67）Mo_2S_4、Al_（0.75）Mo_2S_4、Ga_（0.67）Cr_2S_4和Ga_（0.5）V_2S_4的尖晶石。由于这些尖晶石的阳离子与阴离子之比小于3：4，它们必须含有阳离子空位。X射线衍射研究表明，Al、Ga和空位占据A（四面体）位，Mo、V和Cr占据B（八面体）位。所有的尖晶石都是半导体，并表现出弱铁磁性。磁性能的解释方面的B网站铁磁和反铁磁超交换相互作用。在Ga 0.5V2S4的磁性中观察到的一个反常现象似乎表明可能存在相变。
Spinels with the formula Ga0.67Mo2S4, Al0.75Mo2S4, Ga0.67Cr2S4, and Ga0.5V2S4have been prepared. Since the cation to anion ratio of these spinels is less than 3:4 they must contain cation vacancies. X-ray diffraction studies indicate that the Al, Ga, and vacancies occupy theA(tetrahedral) sites and Mo, V, and Cr the B (octahedral) sites. All of the spinels are semiconductors and exhibit weak ferromagnetism. The magnetic porperties are explained in terms of B site ferro- and antiferromagnetic superexchange interactions. An anomaly observed in the magnetic properties of Ga0.5V2S4at ∼46°K would seem to indicate a possible phase transition.