Effects of Sintering Aids and Sintering Temperature on Large Signal Response of (Sr0.2Ba0.8)TiO3 Ceramics

Author: Hsiu-Fung Cheng, Chu-Nan Chang(Department of Physics, National Taiwan Normal University)

Abstract：

The electrical response of (Sr_0.2Ba_0.8)TiO₃ : Sb³⁺ ceramic materials to high electric field is examined by Sawyer-Tower technique. It is concluded, from the observed ferro-electric hysteresis D-E characteristics of insulating samples and I-V characteristics of PTCR samples, that the mechanism of high resistivity of the materials is resulting from insulating grains rather than the resistive Schottky barrier at grain boundaries. The satu-rated electric polarization (P_s) of these materials decreases with the amount of A1₂O₃ -SiO₂-TiO₂ sintering aids, which is ascribed to the dissolution of Ba²⁺ions into the sec-ond phase segregations, Ba₆Ti₁₇O₄₀, such that the Sr²⁺/Ba²⁺ ratio in the grains in-creases.

Keywords：PTCR, (Sr,Ba)TiO3，Semiconducting ceramics，Ferroelectric hysteresis

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