title: Microstructure and nonohmic properties of SnO₂-Ta₂O₅-ZnO system doped with ZrO₂.
abstract: The microstructure and nonohmic properties of SnO₂-Ta₂O₅-ZnO varistor system doped with different amounts of ZrO₂ (0-2.0 mol%) were investigated. The proposed samples were sintered at 1400°C for 2 h with conventional ceramic processing method. By X-ray diffraction, SnO₂ cassiterite phase was found in all the samples, and no extra phases were identified in the detection limit. The doping of ZrO₂ would degrade the densification of the varistor ceramics but inhibit the growth of SnO₂ grains. In the designed range, varistors with 1.0 mol% ZrO₂ presented the maximum nonlinear exponent of 15.9 and lowest leakage current of 110  μA/cm², but the varistor voltage increased monotonously with the doping amount of ZrO₂.
authors.affiliation: School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Xiuli
authors.initials: X
authors.lastname: Fu
authors.affiliation: School of Engineering and Technology, China University of Geosciences, Beijing 100083, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Jiang
authors.affiliation: School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China ; School of Engineering and Technology, China University of Geosciences, Beijing 100083, China.
authors.forename: Ruichao
authors.initials: R
authors.lastname: Gao
authors.affiliation: School of Engineering and Technology, China University of Geosciences, Beijing 100083, China.
authors.forename: Zhijian
authors.identifier: 0000-0002-8241-1799
authors.initials: Z
authors.lastname: Peng
mesh_terms: D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D008968:Molecular Conformation; D013635:Tantalum / Q000737:chemistry*; D017971:Tin Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D017971:Tin Compounds; D013635:Tantalum; D015040:Zirconium; C045358:stannic oxide; C028541:zirconium oxide; D015034:Zinc Oxide