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

Journal of The Less Common Metals Pub Date : 1991-10-01 DOI:10.1016/0022-5088(91)90013-T

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 Cu_xMn_3−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. (Cu_x⁺Mn_1−x²⁺)_A (Mn_2−x³⁺Mn_x⁴⁺)_BO₄²⁻, changes for x > 0.60 to (Cu_x−y⁺Mn_1−x+y²⁺)_A(Cu_y²⁺Mn_2−x−y³⁺Mn_x⁴⁺)_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 Cu_1.5Mn_1.5O_4+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。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of The Less Common Metals

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