Open AccessElectrical conductivity and temperature sensitivity of Cu/Mo co-modified YFeoO ceramics
Author(s) -
Yuan Zeng,
Zhicheng Li,
Caiyun Gao,
Guangrui Jiang,
Hong Zhang
Publication year - 2021
Publication title -
processing and application of ceramics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.326
H-Index - 15
eISSN - 2406-1034
pISSN - 1820-6131
DOI - 10.2298/pac2102195z
Subject(s) - materials science , ceramic , grain boundary , electrical resistivity and conductivity , orthorhombic crystal system , temperature coefficient , analytical chemistry (journal) , thermistor , x ray photoelectron spectroscopy , sintering , valence (chemistry) , polaron , thermal conduction , doping , composite material , microstructure , crystal structure , chemical engineering , crystallography , electrical engineering , optoelectronics , chemistry , physics , chromatography , quantum mechanics , engineering , electron
To develop a new kind of thermistor with the negative temperature coefficient (NTC) behaviour, the Cu/Mo co-doped YFeO3 based ceramics were prepared by wet-chemical synthesis and sintering at 1300?C. The orthorhombic perovskite structure was identified in all ceramics by XRD analysis. The possible valence states of Fe, Cu and Mo in the doped YFeO3 compounds were examined by X-ray photoelectron spectroscopy. By adjusting the concentration of Cu- and Mo-ions, the room temperature resistivity (?25) and temperature-sensitive constant (B25/85) can be modified from 1.13?103 to 3.09?105 ??cm and 3000 to 7000K, respectively. The complex impedances at various temperatures (from 25 to 150?C) are tested and analysed. The results show that both grain and grain boundary exhibit the NTC characteristics. The electrical conduction mechanisms composing of polaron hopping conduction and band conduction were proposed in the YFeO3 based ceramics.