The PTCR Performance of Nb-Doped BaTiO3-NBT Ceramics

Autor:	Min Gong, Xing Wen Zhu, Xiao Zhou, Tie Zhu Xu, Li Zhe Li, Wen Zhong Jiang
Rok vydání:	2011
Předmět:	Materials science Dopant General Engineering Analytical chemistry Mineralogy Tetragonal crystal system Nb doped Electrical resistivity and conductivity visual_art Phase (matter) visual_art.visual_art_medium Curie temperature Ceramic Temperature coefficient
Zdroj:	Advanced Materials Research. :512-515
ISSN:	1662-8985
DOI:	10.4028/www.scientific.net/amr.299-300.512
Popis:	In this paper, Nb-doped BaTiO3-(Na0.5Bi0.5)TiO3(BBNT-Nb) based PTCR ceramic material has been prepared using high purity Nb2O5, Bi2O3, Na2CO3,TiO2and BaTiO3powders as starting materials, and its structural and electrical properties are investigated. The results indicated that the Nb2O5dopant is helpful not only to promote the formation of tetragonal BBNT structure without any second phase, but also to decrease the room-temperature resistivity. For the 0.10at% Nb-doped BBNT material with BNT content 35mol%, the properties of room-temperature resistance of 104Ω·cm, temperature coefficient (αk) of 6.3%/°C, PTCR anomaly lg(Rmax/Rmin) of 3.6 and Curie temperature (Tc) of 193°C are obtained.
Databáze:	OpenAIRE
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