对草酸盐共沉淀法制取锰锌铁氧体软磁材料粉末的ＦｅＳＯ４ＺｎＳＯ４ＭｎＳＯ４（ＮＨ４）２Ｃ２Ｏ４Ｈ２Ｏ体系进行热力学分析，得出最佳ｐＨ为４０～８２，热力学计算与试验吻合。草酸盐共沉淀粉末煅烧后平均粒径２２０μｍ，烧结温度比普通干法制粉低４０℃左右，制得的温敏锰锌铁氧体材料起始磁导率达４５５０左右，温度灵敏度≤１５℃，并在磁性温敏传感器中应用效果良好 Thermodynamic analysis of the FeSO4ZnSO4MnSO4 (NH4) 2C2O4H2O system prepared by oxalate coprecipitation method for Mn-Zn ferrite soft magnetic powder showed that the optimum pH was 40 ~ 82 and the thermodynamics Calculation and test match. The average particle diameter of oxalate coprecipitated powder after calcination is 2  20μm, the sintering temperature is about 40 ℃ lower than that of ordinary dry  milling, and the initial permeability of the prepared thermo-sensitive Mn-Zn ferrite material is about 4550.Temperature sensitivity ≤ 1  5 ℃, and the magnetic temperature-sensitive sensor with good results