中文摘要：

在空气气氛中1200℃温度下合成了Mn3O4-Fe2O3体系的各类样品,并将其快速淬火到室温.X射线粉末衍射（XRD）分析表明这样得到的该体系样品存在三个固溶体Mn3-3xFe3xO4（0.00≤x≤0.278）,Mn3-3xFe3xO4（0.291≤x≤0.667）和Mn2-2xFe2xO3（0.89≤x≤1.00）.X射线粉末衍射数据的结构精修显示它们分别具有I41/amd空间群的黑锰矿结构、Fd3m空间群的尖晶石结构和R3c空间群的赤铁矿结构.各固溶体之间都存在两相共存的区域.57Fe穆斯堡尔谱数据显示Fe在各个物相中都是Fe3＋,在黑锰矿和尖晶石中存在两种结晶学环境不同的Fe3＋,而在赤铁矿中只存在一种Fe3＋.结合X射线光电子能谱（XPS）的数据,可以认为黑锰矿和尖晶石中的阳离子分布可以用分子式Mn12-＋xFex3＋[Mnx2＋Fex3＋Mn32-＋3x]O4表示,而赤铁矿为Mn23-＋2xFe23x＋O3.

英文摘要：

A series of oxides in the Mn3O4-Fe2O3 system have been synthesized at 1200 ℃ in air,followed by quenching to room temperature.Three solid solutions,Mn3-3xFe3xO4 (0.00≤(X)≤0.278),Mn3-3xFe3xO4(0.291≤(X)≤0.667),and Mn2-2xFe2xO3 (0.89≤(X)≤1.00),have been identified by powder X-ray diffraction (XRD).Rietveld refinement of the XRD data show that the solids belong to the hausmannite phase with the space group 141/amd,the spinel phase with the space group Fd3m,and the hematite phase with the space group R(3)c,respectively.Between these are two-phase regions.27Fe M(o)ssbauer spectra indicate that the valence state of Fe in the three solid solutions is +3; in addition,there are two crystallographically independent Fe3+ ions in the unit cells of the hausmannite and spinel phases,and one Fe3+ in the hematite phase.Analyses of 57Fe M(o)ssbauer spectra and X-ray photoelectron spectra (XPS) revealed that a formula of Mn2+1-xFe(x3+)[Mn(x2+)Fe3+xMn3+2-3x]O4 describes the cation distribution of both the hausmannite and spinel phases,but that for the hematite phase is Mn3+2-2xFe3+2xO3.