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Title: Modification on PTCR Behavior of (Sr 0.2 Ba 0.8 )TiO 3 Materials by Post-heat Treatment After Microwave Sintering
Authors: Horng-Yi Chang;Yen-Yi Lin;Chen-Ti Hu;Kuo-Shung Liu;I-Nan Lin
Contributors: 國立臺灣海洋大學:輪機工程學系
Keywords: Microwave-sintering;PTCR;rapid thermal sintering;(Sr0.2Ba0.8)TiO3;post-heat treatment;resistivity-temperature
Date: 2006-08-19
Issue Date: 2017-01-18T08:22:45Z
Publisher: Integrated Ferroelectrics:An International Journal
Abstract: Abstract:Effect of post-sintering treatment on PTCR behavior of (Sr0.2Ba0.8)TiO3 materials prepared by microwave-sintering (ms) process was compared to that prepared by rapid thermal sintering (RTS) process. The microwave-sintering process needed only 1130°C-40 min to effectively densify (Sr0.2Ba0.8)TiO3 materials. The grain size was around 6 μm and PTCR characteristics was around ρmax/ρmin≈ 10^1.75, with Tc = 50°C. Lowering the cooling rate after sintering substantially increases the resistivity jump (ρmax/ρmin) from 10^2 to 10^3.4, without altering the microstructure. The annealing at 1250°C for 2 h markedly increased the resistivity jump to (ρmax/ρmin)≈10^6. On the other hand, the rapid thermal sintering (RTS) process required 1320°C-30 min to fully develop the good microstructure (∼15 μm) and PTCR property (ρmax/ρmin ∼ 10^3.0). Post-sintering process, including cooling rate control and annealing, did not improve the electrical properties of these samples, that is ascribed to the slow-cooling rate characteristics of RTS-process for a temperature lower than 800°C.
Relation: 13(1-3), pp.55-62
Appears in Collections:[Department of Marine Engineering] Periodical Articles

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