(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 以NiCl2∙6H2O和MnCl2∙4H2O為主鹽，分別與(NH4)2C2O4∙H2O、NaOH和Na2CO3∙10H2O經(jīng)室溫固相合成相應(yīng)的鎳錳化合物，然后分別在400、300、500 ℃溫度下煅燒分解3 h得到鎳錳氧化物。結(jié)合已知的熱力學(xué)數(shù)據(jù)，對室溫固相反應(yīng)的吉布斯自由能變和焓變進(jìn)行計算，從熱力學(xué)的角度出發(fā)，研究不同的反應(yīng)類型對產(chǎn)物結(jié)構(gòu)的影響。采用DSC-TGA、XRD等方法對煅燒分解過程、氧化物的物相和微觀形貌進(jìn)行了分析與表征。結(jié)果表明：鎳錳草酸鹽分解得到NiMn2O4和MnNi2O4；鎳錳氫氧化物分解只得到MnNiO3；鎳錳碳酸鹽分解得到NiMn2O4、MnNi2O4和MnNiO3。鎳錳氧化物粒徑依次增大的順序為：鎳錳氫氧化物、鎳錳草酸鹽、鎳錳碳酸鹽的產(chǎn)物
關(guān)鍵字: 鎳錳氧化物；固相反應(yīng)；熱力學(xué)分析
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Using NiCl2∙6H2O and MnCl2∙4H2O as major reactants, nickel-manganese composites were synthesized by the solid state reaction at room temperatures with three difference reactants ((NH4)2C2O4∙H2O, NaOH, NaCO3∙10H2O). The nickel-manganese oxides were synthesized by calcining three precursors at 400, 300, 500 ℃ for 3 h. and for three solid state reactions at room-temperature were estimated by the thermodynamic data. The effects of difference reaction on the oxides were studied. The processes, particle size and crystallography characters were studied by means of DSC-TGA, XRD and TEM. The results show that spinel NiMn2O4 and MnNi2O4 are obtained by decomposing nickel-manganese oxalic acid; Ilmenite-type MnNiO3 is obtained by decomposing nickel-manganese hydroxide; Ilmenite-type MnNiO3, spinel NiMn2O4 and MnNi2O4 are obtained by decomposing nickel-manganese carbonate. The particle size of nickel-manganese oxide products increases by turn of nickel-manganese hydroxide, oxalic acid, carbonate
Key words: nickel-manganese oxide; solid state reaction; thermodynamic analysis
