CAJ | 학술논문

以低冰镍为原料，采用草酸盐共沉淀法合成颗粒细小的铁酸镍前躯体 NiFe2(C2O4)3·6H2O。NiCl2?FeCl2?(NH4)2C2O4?H2O体系的热力学研究表明：Ni2+和Fe2+的理论最佳共沉淀pH值为2，2?24C O 对Ni2+、Fe2+离子具有较强的络合作用。在理论研究的基础上，考察沉淀参数对沉淀率和前躯体粒度的影响。结果表明：最佳共沉淀条件为溶液pH=2，反应温度为45°C，(NH4)2C2O4加入量为理论值的1.2倍，PEG400加入量为3%。在此条件下，Ni2+和Fe2+的沉淀率达99.8%，所得前躯体的粒径为1~2 um。XRD和TG?DTA分析表明：所得前躯体为单相置换固溶体，反应过程中镍、铁原子相互取代。
이저빙얼위원료，채용초산염공침정법합성과립세소적철산얼전구체 NiFe2(C2O4)3·6H2O。NiCl2?FeCl2?(NH4)2C2O4?H2O체계적열역학연구표명：Ni2+화Fe2+적이론최가공침정pH치위2，2?24C O 대Ni2+、Fe2+리자구유교강적락합작용。재이론연구적기출상，고찰침정삼수대침정솔화전구체립도적영향。결과표명：최가공침정조건위용액pH=2，반응온도위45°C，(NH4)2C2O4가입량위이론치적1.2배，PEG400가입량위3%。재차조건하，Ni2+화Fe2+적침정솔체99.8%，소득전구체적립경위1~2 um。XRD화TG?DTA분석표명：소득전구체위단상치환고용체，반응과정중얼、철원자상호취대。
Fine nickel ferrite precursors NiFe2(C2O4)3·6H2O were obtained via co-precipitation method with low grade nickel matte as the raw material. Thermodynamic analysis of NiCl2?FeCl2?(NH4)2C2O4?H2O system for precipitation identified that the theoretical optimum co-precipitation pH value is 2, and 2?2 4C O has strong complexation with Ni2+and Fe2+ions. Based on these theoretical considerations, the effects of parameters on the precipitation rates and precursors size were investigated systematically. The results show that the optimum co-precipitation conditions are pH=2, temperature 45 °C, 1.2 times theoretical amount of (NH4)2C2O4 dosage and 3%PEG400 addition. Under these conditions, the precipitation rates of Ni2+and Fe2+are both over 99.8%, with the precursors size of 1?2 um. Furthermore, X-ray diffraction (XRD) and thermogravimetry-differential thermal analysis (TG-DTA) demonstrate that the precursors are single-phase solid solution, wherein the nickel/iron atoms are replaced by the iron/nickel atoms reciprocally.