A stress-sensing ceramic device based on PTCR barium titanate

Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics Pub Date : 1994-08-07 DOI:10.1109/ISAF.1994.522473

J. S. Capurso, W. Schulze

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Abstract

Positive temperature coefficient of resistance (PTCR) barium titanate is used as the base material for a ceramic sensor which employs piezoresistivity to detect changes in applied stress. Tape-cast sheets of undoped (insulating) and PTCR (semiconducting) BaTiO/sub 3/ are laminated to produce a three-layer "trilaminate"-a sintered structure which has two PTCR layers separated by an insulating layer. The trilaminate is exposed to mechanical stress in a four-point bend configuration (placing one semiconducting layer completely in tension, the other in compression), and the resistivities for both stress states are measured concurrently as functions of the applied stress magnitude. The piezoresistivity coefficient (/spl pi/) is calculated from the slope of the linear resistivity-stress response. Piezoresistivity results are presented versus PTCR layer composition (counterdopant species) and furnace cooling conditions (grain boundary oxidation level). These results are interpreted with respect to Heywang's model of the gain boundary potential barrier.

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一种基于PTCR钛酸钡的应力传感陶瓷装置

正电阻温度系数(PTCR)钛酸钡用作陶瓷传感器的基材，该传感器采用压电阻率来检测外加应力的变化。未掺杂(绝缘)和PTCR(半导体)BaTiO/ sub3 /的带铸片被层压以产生三层“三胺化”-一种烧结结构，其中两个PTCR层被绝缘层隔开。将三胺酸盐暴露在四点弯曲结构中的机械应力下(将一个半导体层完全置于拉伸状态，另一个处于压缩状态)，并同时测量两种应力状态下的电阻率，作为施加应力大小的函数。压阻系数(/spl pi/)由线性电阻率-应力响应的斜率计算。压电阻率结果与PTCR层组成(反掺杂剂种类)和炉冷却条件(晶界氧化水平)有关。这些结果是根据Heywang的增益边界势垒模型来解释的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics

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