Breakdown Characteristics of Ferroelectric Glass-Ceramic Dielectric for Pulsed Power Applications

摘要

Breakdown characteristics of ferroelectric glass-ceramic capacitors in the PbO-SrO-Na2O-Nb2O5-SiO2 system were studied, including under dc charging and pulse charging. Results revealed that capacitance before and after charging was with no significant alternation. Relationship between dielectric constant and electric field was also explored. Meanwhile, a peculiar phenomenon was found that the breakdown strength of glass-ceramic dielectric under pulse charging was much lower than that under dc charging, which is of considerable discrepancy to common theory. Possible explanations were summarized afterward.