MgZr4(PO4)6的反应及高温电性能研究

Study on MgZr4(PO4)6 Reaction and High Temperature Electrical Properties

以Mg(OH)2、NH4H2PO4、ZrCl2O·8H2O为原料,在不同的热处理温度(800℃、900℃、1000℃、1100℃)下应用固相反应法合成磷酸镁锆(MgZr4,PO4)6(MZP)粉体,研究了其热重-示差扫描热(TG/DSC)图谱、物相组成、微观形貌和高温电性能。结果表明,900℃处理下可以合成纯相MZP粉体,且粉体能稳定存在。随着热处理温度的升高,出现了Zr2O(PO4)2第二相产物,其物量随着热处理温度的升高而增多。合成的MZP粉末具有2~5μm大小不等的颗粒状,表面粗糙,并有更小颗粒聚集及呈不规则立方体状,还有极少量的形状为棒状,表面光滑,尺寸大小为2μm的两种形态。随着温度的升高,MZP由于镁离子通道扩散能力的增加,试样的电导率提高了3个数量级。

Using Mg(OH)2,NH4H2PO4,ZrCl2O·8H2O as raw materials,MgZr4(PO4)6(MZP)powder was synthesized by solid phase reaction method at four different heat treatment temperatures of 800℃,900℃,1000℃,1100℃.The TG/DSC atlas,phase composition,micro-morphology,high temperature electrical properties of the synthesized MZP powder were investigated.The results show that pure phase MZP powder can be synthesized at 900℃,and the powder can exist stably.With the increase of the heat treatment temperature,the second phase product of Zr2O(PO4)2 appeared in the synthesis product,and its amount increased with the increase of the heat treatment temperature.The synthetic MZP powder has two forms,one is a granular shape with a size ranging from 2μm to 5μm,the surface is rough,and smaller particles are aggregated;the other is an irregular cube shape,and a very small amount of shape is rod-shaped with a smooth surface and a size of 2μm.As the temperature increases,the conductivity of the MZP sample increases by three orders of magnitude due to the increased diffusion capacity of the magnesium ion channel.