Premium
A Silicon Carbonitride Ceramic with Anomalously High Piezoresistivity
Author(s) -
Zhang Ligong,
Wang Yansong,
Wei Yun,
Xu Weixing,
Fang Danjie,
Zhai Lei,
Lin KuoChi,
An Linan
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02275.x
Subject(s) - piezoresistive effect , gauge factor , materials science , ceramic , composite material , percolation (cognitive psychology) , compressive strength , silicon , stress (linguistics) , electrical resistivity and conductivity , strain gauge , condensed matter physics , metallurgy , electrical engineering , fabrication , medicine , linguistics , philosophy , alternative medicine , pathology , neuroscience , biology , engineering , physics
The piezoresistive behavior of a silicon carbonitride ceramic derived from a polymer precursor is investigated under a uniaxial compressive loading condition. The electric conductivity has been measured as a function of the applied stress along both longitudinal and transverse directions. The gauge factor of the materials was then calculated from the data at different stress levels. The results show that the material exhibits an extremely high piezoresistive coefficient along both directions, ranging from 1000 to 4000, which are much higher than any existing ceramic material. The results also reveal that the gauge factor decreases significantly with increasing applied stress. A theoretical model based on the tunneling–percolation mechanism has been developed to explain the stress dependence of the gauge factor. The unique piezoresistive behavior is attributed to the unique self‐assembled nanodomain structure of the material.