期刊目錄列表 - 31~41期(1986-1996) - 第四十期 (1995)
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燒結助劑與燒結溫度對鈦酸鍶鋇陶瓷大信號反應的影響
作者:鄭秀鳳、張秋男(國立臺灣師範大學物理學系)

摘要:

本研究利用Sawyer-Tower法,來探討添加施體?之鈦酸鍶鋇(Sr,Ba)TiO3陶瓷,在高電場作用下的電性反應。綜合實驗中所觀察到的絕緣性樣品之電位移-電場(D-E)電滯曲線與具正電阻溫度係數(PTCR)樣品之電流-電壓(I-V)特性曲線,提出絕緣性鈦酸鍶鋇的導電機制,亦即,絕緣樣品(Sr,Ba)TiO3的高電阻性係樣品中絕緣晶粒所造成的飽和自發極化(spontaneous polarization)隨助燒結劑三氧化二鋁-二氧化矽-二氧化鈦的含量之增加而減少,這主要歸因於(Sr,Ba)TiO3中的Ba2+ 離子溶解形成二相析出物Ba6Ti17O40,因此晶粒中的比值Sr2+/Ba2+增加所形成的。

關鍵詞:正電阻溫度係數、鈦酸鍶鋇、半導電陶瓷、電滯

《詳全文》

Journal directory listing - Volume 31-41 (1986-1996) - Volume 40 (1995)
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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 (Sr0.2Ba0.8)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 (Ps) 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