Spectroscopic and magnetic study of the (Mg,M)3(ASO4)2·8H2O (M = NI2+, CO2+) arsenates
作者:J.M. Rojo、J.L. Mesa、J.L. Pizarro、L. Lezama、M.I. Arriortua、T. Rojo
DOI:10.1016/s0025-5408(96)00088-8
日期:1996.8
Abstract Compounds of general formula (Mg,M) 3 (AsO 4 ) 2 ·8H 2 O (M = Ni 2+ , Co 2+ ) have been synthesized and characterized. The crystal structure of the (Mg 2.5 Ni 0.5 )(AsO 4 ) 2 ·8H 2 O compound has been refined using the Rietveld method. The final reliability factors are R p = 5.62, R wp = 7.06, and R B = 5.29. Crystallographic studies reveal that both the ionic radius of the cations and the
摘要 合成并表征了通式(Mg,M) 3 (AsO 4 ) 2 ·8H 2 O (M = Ni 2+ , Co 2+ ) 的化合物。(Mg 2.5 Ni 0.5 )(AsO 4 ) 2 ·8H 2 O 化合物的晶体结构已使用 Rietveld 方法进行了细化。最终的可靠性因子是 R p = 5.62、R wp = 7.06 和 RB = 5.29。晶体学研究表明,阳离子的离子半径和八面体位点的对称性在确定这些化合物中的阳离子排序方面都起着重要作用。漫反射光谱表明镍和钴-氧键存在显着的共价关系。磁性测量和结构特征的分析表明化合物中存在强烈的二聚体铁磁相互作用。