PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties
PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties
Barium titanate is widely used in the fabrication of thermistors with a positive temperature coefficient of resistivity (PTCR). The resistivity can increase by several orders of magnitude near the phase transition temperature Tc for the ferroelectric tetragonal to the paraelectric cubic phase transformation. There is general agreement that the anomaly in the change of electrical resistivity of donor doped BaTiO3 around Tc is due to the grain boundary effect. The Heywang?Jonker model and other mechanisms involving the nature of the electrical barrier formed across the grain boundaries of polycrystalline BaTiO3 are reviewed. The compositional effect on BaTiO3 based PTCR properties is listed and discussed. The influences of manufacturing methods under different stages including the initial doping methods, sample forming methods and final heat treatments on PTCR properties are compared. The complex interrelationships between compositions, microstructures, processing and PTCR characteristics are well discussed
257-269
Chen, Yulong
c169c2b5-8f32-4857-8436-42acf15d9ce8
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
1 July 2011
Chen, Yulong
c169c2b5-8f32-4857-8436-42acf15d9ce8
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Chen, Yulong and Yang, Shoufeng
(2011)
PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties.
Advances in Applied Ceramics, 110 (5), .
(doi:10.1179/1743676111Y.0000000001).
Abstract
Barium titanate is widely used in the fabrication of thermistors with a positive temperature coefficient of resistivity (PTCR). The resistivity can increase by several orders of magnitude near the phase transition temperature Tc for the ferroelectric tetragonal to the paraelectric cubic phase transformation. There is general agreement that the anomaly in the change of electrical resistivity of donor doped BaTiO3 around Tc is due to the grain boundary effect. The Heywang?Jonker model and other mechanisms involving the nature of the electrical barrier formed across the grain boundaries of polycrystalline BaTiO3 are reviewed. The compositional effect on BaTiO3 based PTCR properties is listed and discussed. The influences of manufacturing methods under different stages including the initial doping methods, sample forming methods and final heat treatments on PTCR properties are compared. The complex interrelationships between compositions, microstructures, processing and PTCR characteristics are well discussed
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PTCR_review_paper_eprint.doc
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Published date: 1 July 2011
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 343301
URI: http://eprints.soton.ac.uk/id/eprint/343301
ISSN: 1743-6753
PURE UUID: e091d90c-1103-4210-95ea-df9d82734a2d
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Date deposited: 03 Oct 2012 11:01
Last modified: 14 Mar 2024 12:02
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Author:
Yulong Chen
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