Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19282
Title: Semiconducting barium titanate ceramics prepared by using yttrium hexaboride as sintering aid
Authors: Wang, XX
Chan, HLW 
Pang, GKH
Choy, CL 
Keywords: BaTiO3 ceramics
Doping effect
Grain boundary
Sintering
Thermistor
YB6
Issue Date: 2003
Publisher: Elsevier
Source: Materials science and engineering. B, Solid-state materials for advanced technology, 2003, v. 100, no. 3, p. 286-291 How to cite?
Journal: Materials science and engineering. B, Solid-state materials for advanced technology 
Abstract: Nb-doped BaTiO3 semiconducting ceramics have been prepared at 1150 °C by employing YB6 as the sintering aid. The low-temperature sintered samples exhibit a positive temperature coefficient of resistivity (PTCR) effect. The room-temperature resistivity and the magnitude of PTCR effect depend on the amount of YB6 added, the Nb2O5 content and the sintering conditions. At 1 mol% of YB6, the sample has a low room-temperature resistivity and a resistivity jump of about 104. Transmission electron microscope studies revealed that the intergranular region between the crystalline BaTiO3 grains has an amorphous structure. Y, Ba and Ti are present in the intergranular region but no Y is detectable in the crystalline grains. A liquid phase is believed to be present during sintering and it helps to facilitate the densification process and to enhance the PTCR effect.
URI: http://hdl.handle.net/10397/19282
ISSN: 0921-5107
DOI: 10.1016/S0921-5107(03)00118-1
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