Journal ArticleDOI
PTCR Characteristics and Fabrication of Porous, Sb-Doped BaTiO 3 Ceramics
TLDR
In this article, the effect of corn-starch on positive temperature coefficient of resistivity (PTCR) characteristics and microstructures of Sb-doped BaTiO3 ceramics was investigated.Abstract:
Sb-doped BaTiO3 ceramics containing corn-starch were prepared by sintering at 1350°C for 1 h in air. In this study, the effect of corn-starch on positive temperature coefficient of resistivity (PTCR) characteristics and microstructures of Sb-doped BaTiO3 ceramics was investigated. It was found that the porosity and pore size increased and the grain size slightly decreased with increasing corn-starch content. XRD results showed the presence of BaTiO3 peaks only in the Sb-doped BaTiO3 ceramics with and without corn-starch. The PTCR jump of the Sb-doped BaTiO3 ceramics with corn-starch was over 106 and 1–2 orders higher than that of samples without corn-starch. The increase in the room-temperature resistivity with increasing corn-starch content was attributed mainly to the increase in the electrical barrier height of grain boundaries and the porosity as well as the partial decrease in the donor concentration of grains and the grain size. It was also noticed that the grain boundary resistivity contributed largely to the total resistivity of the Sb-doped BaTiO3—corn-starch ceramics.read more
Citations
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Journal ArticleDOI
PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties
Yulong Chen,Shoufeng Yang +1 more
TL;DR: Barium titanate is widely used in the fabrication of thermistors with a positive temperature coefficient of resistivity (PTCR) and the resistivity can increase by several orders of magnitude n... as mentioned in this paper.
Journal ArticleDOI
Research trend in the development of macroporous ceramic components by pore forming additives from natural organic matters: A short review
TL;DR: In this article, the progress made thus far in the development of porous ceramic systems with natural organic matter inclusion has been documented and critical evaluation and comprehensive comparison of the fabrication routes and the physical properties of porous ceramics processed with varying natural organic matters.
Journal ArticleDOI
Effect of heating rate on the properties of Sb and Mn-doped barium strontium titanate PTCR ceramics
TL;DR: In this article, Antimony and manganese-doped barium strontium titanate (BST) ceramics, containing silica and titania sintering additives, were prepared using various heating rates between 1-20 °C/min.
Journal ArticleDOI
Modified-starch Consolidation of Alumina Ceramics
TL;DR: In this article, a modified oxidized tapioca starch was analyzed by optical microscope, and two other corn starches (common corn starch and high amylose corn starch) were also analyzed for comparison.
Journal ArticleDOI
Characteristics of Porous Sb-Doped Barium Titanate Ceramics Fabricated by Adding Graphite
Nurafizalwani Ayub,Ramli Omar,Mohamad Deraman,Ibrahim Abutalib,Zalita Zainuddin,Atiqah Abdul Aziz +5 more
TL;DR: In this paper, the porosity and electrical resistivity of porous Sb-BaTiO3-based ceramics were investigated with and without graphite and with graphite.
References
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Journal ArticleDOI
Resistivity Anomaly in Doped Barium Titanate
TL;DR: In this article, the authors reexamined the barrier-layer model to explain the anomalous increase in resistivity that occurs in doped BaTiO3 in the light of data obtained from more recent experiments.
Journal ArticleDOI
Capacitance‐vs‐voltage characteristics of ZnO varistors
TL;DR: In this paper, the capacitance-vs-voltage characteristics of ZnO varistors which contain rare earth metal oxides and cobalt oxide were studied on the basis of the symmetrical Schottky-barrier model of the grain boundary region.
Journal ArticleDOI
Effect of Microstructure on the PTCR Effect in Semiconducting Barium Titanate Ceramics
TL;DR: In this article, the microstructural influence on the PTCR effect in semiconducting barium titanate ceramics was studied and a method for preparing the ceramic bodies exhibiting a PTCRs effect of more than seven orders of magnitude was established.
Journal ArticleDOI
Composite PTCR thermistors, utilizing conducting borides, silicides, and carbide powders
TL;DR: In this paper, the percolation and subsequent PTCR effects were observed for all the powders in both semi-crystalline (polyethylene) and amorphous (epoxy) polymer matrix materials.
Journal ArticleDOI
Effect of Sintering Aids on Microstructures and PTCR Characteristics of (Sr0.2Ba0.8)TiO3 Ceramics
TL;DR: In this article, the effects of liquid-phase sintering aids on the microstructures and PTCR characteristics of (Sr0.2Ba0.8)TiO3 materials have been studied.
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