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Pr_(2-x)Sr_xNiO_(4±δ)的合成、结构和电磁性质

By 李思温, 任玉芳 and 王鸿燕

Abstract

用固相法合成了Pr_(2-x)Sr_xNiO_(4±δ)(0.0≤x≤1.0)系列K_2NiF_4型化合物,研究了其结构,红外光谱,电磁性质。当0.0≤x<0.1和x=1.0时以正交晶系结晶;当0.1≤x<1.0时以四方晶系结晶;Ni离子平均价态在+2至+3价之间。当x值较小时,样品中含有过量的氧。NiO_6八面体中Ni ̄(3+)的Jahn-Teller畸变引起c/a值在x=0.5处出现极大,在77~250K之间,样品磁性质符合居里-外斯定律,并表现出反铁磁相互作用。电学性质的变化可以理解为Ni ̄(3+)离子电子组态由:变至的结

Topics: 镨锶镍复合氧化物, 晶体结构, 电学性质, 磁学性质
Year: 1994
OAI identifier: oai:ir.ciac.jl.cn:322003/28657
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