研究了在ZnO压敏材料组分中以溶液方式加入稀土氧化物Pr6O11后其微观结构的变化.结果表明,Pr6O11的加入改变了ZnO尖晶石相的生成途径,使该材料在低于700℃时生成大量焦绿石相(Bi3Zn2Sb3O14).当烧成温度高于900℃时,焦绿石相分解生成细小的二次尖晶石相(Zn7Sb2O12).这种二次生成的细小尖晶石使材料晶粒尺寸减小,分布均匀;此外,Pr6O11的引入能生成含Pr物相,以及Pr氧化物相也有利于材料的晶粒细化.晶粒细化结果改善了ZnO压敏材料的压敏电压和非线性特性,与掺杂前相比,压敏电压提高了约60%.
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