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V-shaped PTCR properties of (Pb,Sr)TiO3 materials prepared by conventional, rapid thermal and microwave sintering processes

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4 Author(s)
Chang, H.Y. ; Mater. Sci. Center, Nat. Tsing Hua Univ., Hsinchu, Taiwan ; Lin, I.N. ; Lin, Y.Y. ; Hu, C.T.

(Pb0.6Sr0.4)TiO3 materials containing Y3+ as donors and TiO2/SiO2 as sintering aids were densified by either conventional sintering (CS), rapid thermal sintering (RTS) or microwave sintering (MS) process. V-shaped PTCR characteristics with Tc=220°C were obtained by conventional sintering at 1270-1300°C for 30 min. Double-Tc PTCR behaviors with Tc1=260°C and Tc2=430°C were resulted by rapid-thermal sintering at 1250-1300°C for 30 min. By contrast, a single high-Tc resistivity-temperature (ρ-T) properties with Tc-value as high as 460°C was observed by microwave sintering of these materials at 1100°C for 10 min. The unique properties of these materials were ascribed to the formation of core-shell microstructure, which was induced by rapid cooling rate after sintering in RTS or MS process. The core was deficient and the shell was riched in Pb-species. The composition of the shell was estimated to be around (Pb0.9Sr 0.1)TiO3. A conduction model was proposed based on these observations

Published in:

Applications of Ferroelectrics, 1996. ISAF '96., Proceedings of the Tenth IEEE International Symposium on  (Volume:2 )

Date of Conference:

18-21 Aug 1996