与电网输变电设备防灾减灾国家重点实验室合作的文章Significantly Enhanced Varistor Properties of CaCu3Ti4O12 Based Ceramics by Designing Superior Grain Boundary: Deepening and Broadening Interface States在知名期刊Journal of Materials Science & Technology上正式发表。

Significantly enhanced varistor properties via tailoring interface states were obtained in Ca1-2x/3YxCu3Ti4O12-SrCu3Ti4O12 composite ceramics. The breakdown field was improved to 35.8 kV·cm-1 and the nonlinear coefficient at 0.1~1 mA·cm-2 was enhanced to 14.6 for Ca0.67Y0.5Cu3Ti4O12-SrCu3Ti4O12. Noticeably, the withstand voltage of single grain boundary reached up to 24 V while the reported ones were constant about 3 V. Greatly improved properties were attributed to formation of superior grain boundary rather than merely reducing grain size. Surprisingly, with distinct discrepancy of nonlinear performance in composites, the resistance and activation energy of grain boundary exhibited little difference. Based on the double Schottky barrier at grain boundary and field-assisted thermal emission model, it was found that the excellent electrical nonlinearity arose from formation of deep and broad interface states at grain boundary. In this case, interface states were not easily filled and the barrier could maintain its height under high voltage. This work provides a novel routine for enhancing the varistor properties of CaCu3Ti4O12 based ceramics by manipulating interface states at grain boundary.

显著提升的单晶界耐压特性

论文链接：10.1016/j.jmst.2021.07.057

“JMST创刊于1985年，是中国第一本材料学科英文学术期刊，同Elsevier出版公司合作出版。JMST全年来稿数量约4000篇左右，其中近70%为海外投稿，分别来自世界各地约80多个国家和地区，总体退稿率约为93%。JMST被SCI，EI，CA等众多国际著名检索数据库收录。最新SCI影响因子为8.067，位居中国材料综合性学术期刊榜首，进入中科院分区一区（top期刊），同时，位于SCI冶金学科Q1区和材料综合学科Q1区。”