CAJ | 학술논문

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141lamd空间群的黑锰矿结构、Fd3m空间群的尖晶石结构和R-3c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Mn2+1-xFe3+x[Mn2+xFe3+xMn3+2-3x]O4表示,而赤铁矿为Mn3+2-2xFe2+2xO3.
재공기기분중1200℃온도하합성료Mn3O4-Fe2O3체계적각류양품,병장기쾌속쉬화도실온.X사선분말연사(XRD)분석표명저양득도적해체계양품존재삼개고용체Mn3-3xFe3xO4(0.00≤X≤0.278),Mn3-3xFe3xO4(0.291≤X≤0.667)화Mn2-2xFe2xO3(0.89≤X≤1.00).X사선분말연사수거적결구정수현시타문분별구유141lamd공간군적흑맹광결구、Fd3m공간군적첨정석결구화R-3c공간군적적철광결구.각고용체지간도존재량상공존적구역.57Fe목사보이보수거현시Fe재각개물상중도시Fe3+,재흑맹광화첨정석중존재량충결정학배경불동적Fe3+,이재적철광중지존재일충Fe3+.결합X사선광전자능보(XPS)적수거,가이인위흑맹광화첨정석중적양리자분포가이용분자식Mn2+1-xFe3+x[Mn2+xFe3+xMn3+2-3x]O4표시,이적철광위Mn3+2-2xFe2+2xO3.
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.