【作者】 张瑞英； 朱命炜； 邢怀民； 戴宪起； 程国生； 靳建华； 白炳贤； 董成； 张金仓；

【Author】 Zhang Ruiying Zhu Mingwei Xing Huaiming Dai Xianqi ChengGuosheng Jin Jianhua~+ Bai Bingxian~+ Dong Cheng~(++) Zhang Jincang (Department of Physics,+ Department of Chemistry,Henan Normal University,Xinxiang,453002,China) (++ Institute of Physics,Chinese Academia Sinica,Beijing,100080,China)

【机构】 河南师范大学物理系； 河南师范大学化学系； 中国科学院物理研究所；

【摘要】 本文对共沉淀法和固态反应法所制前驱物按相同烧结条件制得系列性样品进行了对比研究。结果表明:与固态反应法相比,一方面共沉淀法所制样品有效地抑制了烧结过程中晶粒长大,提高了晶粒表面能和界面能,增强活性,因而降低了烧结温度;另一方面,在相同的烧结条件下共沉淀样品尖晶石相中Zn₇Sb₂O₁₂与Co₇Sb₂O₁₂浓度的比值大于固态反应法样品的相应值,因而其非线性系数较大;并且其晶粒细化均匀,增加了材料单位长度上的有效晶界数,提高了阈值电压,从整体上改善了材料的压敏特性。更多还原

【Abstract】 ZnO varistors were synthesized by coprecipitation and solid state reaction technique.The electrical measurement and structure analysis were made.The results show that,compared with conventional sampies, the coprecipitation samples can inhibit its grain growth and lower its sintering temperature.At the same time,it is profitable for increasing its surface and boundary energy and en-hancing its activity.Under the same sintering conditions,the ratio of the concentration of Zn₇Sb₂O₁₂ to the concentration of Co₇Sb₂O₁₂ in coprecipitation samples,i.e.PZ / PC,is larger than that inconventional samples.And there is a smaller grain size and uniformity,which increase the effective grain boundary numbers per unit,its breakdown voltage E_b and nonlinear coefficientαare improved.更多还原