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Title: Electrical Characteristics of (Sr 0.2 Ba 0.8 )TiO 3 Positive Temperature Coefficient of Resistivity Materials Prepared by Microwave Sintering
Authors: Horng‐Yi Chang;Kuo‐Shung Liu;I‐Nan Lin
Contributors: 國立臺灣海洋大學:輪機工程學系
Date: 1995-02
Issue Date: 2017-01-18T08:37:46Z
Publisher: Journal of Applied Physics
Abstract: Abstract:The resistivity‐temperature (ρ‐T) properties of the (Sr0.2Ba0.8)TiO3 materials densified by the microwave sintering process were investigated. Neither the sintering temperature (1100–1180 °C) nor the soaking time (10–40 min) in this process exert a significant influence on the positive temperature coefficient of resistivity behavior of the as‐sintered samples. Contrarily, reducing the cooling rate from 154 °C/min to 4 °C/min or post‐annealing the samples at 1250 °C for 2 h would increase the maximum resistivity (ρmax) more than three orders of magnitude. Consequently, the resistivity jump with the maximum to minimum resistivity ratio ρmax/ρmin≊107 has been achieved. The increase in maximum resistivity by these processes is ascribed to the increase in cationic vacancies, which subsequently act as effective electronic traps. The trap level (Ese) of the cationic vacancies is estimated from the Arrhenius plots of maximum resistivity (ρmax) and temperature (Tmax) to be Ese≊1.5–2.0 eV. On the other hand, the ρ‐T curves in the T≳Tmax regime estimate the intrinsic trap level (Esi) of the (Sr0.2Ba0.8)TiO3 materials to be Esi≊2.46–2.51 eV.
Relation: 78(1)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40423
Appears in Collections:[輪機工程學系] 期刊論文

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