以高温固相反应法合成了Mn3-xNiO4(0.5≤x≤1.0)和Mn3-x-yNiCuyO(0.5≤x≤1.0,0≤y≤0.5)材料,用XPS和XRD手段对尖晶石结构中存在的阳离子价态和分布情况进行了研究.指出随Ni含量的变化,Ni占据A位的比例ω为:ω=549.6×e-2.85174/x并探讨了阳离子分布对电性能的影响.同时指出在Mn3-x-yNixCuyO材料中存在着占据B位的Cu+,Cu+的出现使得B位相应产生了大量的可引起跳跃电导的Mn4+,且产生了第二种跳跃电导机制:Cuoct+,+Mn+oct→Cutet2+Mnoct3+.这一发现可以成功解释该系材料的电导率和热老化系数比未掺杂Cu的同类材料高得多的原因.
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