Open AccessThe study of ZnO varistor doped with ferromagnetic manganese oxide
Author(s) -
Yang Xin-Sheng,
Zhao Yong
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.3188
Subject(s) - materials science , ferromagnetism , magnetoresistance , doping , grain boundary , manganese , varistor , condensed matter physics , ceramic , oxide , phase (matter) , magnetic field , microstructure , composite material , metallurgy , optoelectronics , electrical engineering , voltage , chemistry , physics , engineering , organic chemistry , quantum mechanics
ZnO varistor doped with ferromagnetic manganese oxide (La07Sr03MnO3) was prepared by conventional electric ceramic technique. There are secondary phases, La07Sr03MnO3 and LaMnO3, existing at the grain boundaries. The content of insulating phase of LaMnO3 obviously affects the electrical properties of the samples. The samples still remained ferromagnetism after doping. Applied magnetic filed could change the electrical property. The resistance increased when magnetic field was applied, showing a positive magnetoresistance (PMR) phenomenon. The existence of PMR is due to the broadening of barrier at the grain boundaries caused by the magnetic field.