Grain boundary characteristics of batio3 PTC thermistor
Titel:
Grain boundary characteristics of batio3 PTC thermistor
Auteur:
Hong-Tao, Sun Liang-Ying, Zhang Xi, Yao
Verschenen in:
Ferroelectrics letters section
Paginering:
Jaargang 14 (1992) nr. 1-2 pagina's 45-51
Jaar:
1992-05-01
Inhoud:
A method to calculate physical parameters of grain boundaries of BaTio3 PTC thermistor is presented in this paper. Increasing temperature form 20°C to 200°C, the grain boundary parameters take a sudden change near 130°C., Capacitance of depletion layer decreases form 40 to 15 uF/cm2, while barrier height, charge density and depletion layer width increases from 0.05 to 0.03 eV, 3.5 to 8.5 uC/cm2, and 0.7 to 2.0 nm, respectively. From TEM observation, three types of grain boundaries have been identified. The calculated parameters are an average of al grain boundaries.