An IR spectroscopic investigation of copper manganite CuxMn3−xO4 (O < x <1) spinels and their oxidation products

M Kharroubi, B Gillot, R Legros, R Metz, A.C Vajpei, A Rousset
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引用次数: 13

Abstract

The IR absorption spectra of tetragonal copper manganite CuxMn3−x O4 spinels (O < x < 1) have singled out a discontinuity in cation distribution to occur at x > 0.60 in conformity with that recorded by our previous measurements and have warranted the existence of a more complex cation distribution than that proposed earlier. It has been concluded from this study that the ionic configuration for x <0.60, i.e. (Cux+Mn1−x2+)A (Mn2−x3+Mnx4+)BO42−, changes for x > 0.60 to (Cuxy+Mn1−x+y2+)A(Cuy2+Mn2−xy3+Mnx4+)BO42−, where y represents a low value (less than 0.20).

When the oxidation of Mn2+ and Cu+ ions is achieved below 450 °C, IR absorption measurements confirm the formation of a cation-deficient metastable spinel phase Cu1.5Mn1.5O4+δ with a 1:3 octahedral superstructure.

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铜锰矿CuxMn3−xO4 (O < x <1)尖晶石及其氧化产物的红外光谱研究
四方铜锰酸盐CuxMn3−x O4尖晶石(O<;x<;1)的红外吸收光谱已经指出在x>;0.60,与我们之前的测量结果一致,并证明存在比之前提出的更复杂的阳离子分布。从该研究中得出结论,x<;0.60,即(Cux+Mn1−x2+)A(Mn2−x3+Mnx4+)BO42-,x的变化>;0.60至(Cux−y+Mn1−x+y2+)A(Cuy2+Mn2−x−y3+Mnx4+)BO42−,其中y表示一个低值(小于0.20)。当Mn2+和Cu+离子的氧化在450°C以下实现时,IR吸收测量证实形成了具有1:3八面体超结构的缺阳离子亚稳尖晶石相Cu1.5Mn1.5O4+δ。
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