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用交流阻抗方法对粉末状和压片的电解MnO_2(EMD)和天然锰矿进行测量。其电阻率有下列顺序:ρ日本锰粉<ρ湘潭锰粉<ρ松桃锰粉。电阻率与外加压力有关。经不同温度烘烤后,阻抗谱有明显变化。讨论了噪声对高频测量的影响。用最小二乘法来模拟压片状阻抗谱。说明它是由晶粒、晶界和颗粒间界三部分阻抗组成。探讨了它与MnO_2电化学活性的关系。
Measurement of Electrolytic MnO2 (EMD) and Natural Manganese Ore in Powdered and Pelletized by AC Impedance Method. The resistivity in the following order: ρ Japan manganese <ρ Xiangtan manganese ρ odium pine nut powder. Resistivity and applied pressure. After baking at different temperatures, the impedance spectrum changes significantly. The effect of noise on high frequency measurements is discussed. The least square method was used to simulate the sheet resistance spectrum. It shows that it is composed of grain, grain boundary and grain boundary three parts impedance. Its relationship with the electrochemical activity of MnO 2 was discussed.