Title :
Y5U multilayer ceramic capacitors with high-specific capacitance and low-equivalent series resistance
Author :
Ochi, Atsushi ; Mori, Toru ; Nakanishi, Muneaki ; Utsumi, Kazuaki ; Abe, Shinji ; Yoshimoto, Tetsuo
Author_Institution :
NEC Corp., Kawasaki, Japan
Abstract :
A dielectric powder material, for Y5U multilayer ceramic capacitors was developed in the Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-Pb(Ni/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ ternary system by using an alkoxide process. Multilayer ceramic chip capacitors (10 mu F) with high specific capacitances were fabricated using this powder. A Ag80%-Pd20% alloy was used for the internal electrodes. The alkoxide-derived capacitor had an extremely high specific capacitance of about 500 mu F/cm/sup 3/ and a small temperature dependence meeting Y5U specifications of the EIA standard. The equivalent series resistance was approximately 20 m Omega at 500 kHz. The breakdown voltages of the capacitor were 300 V or higher. In accelerated load life tests and load humidity tests, no degradation of insulation resistance was found during 1000 h of testing.<>
Keywords :
capacitors; ceramics; ferroelectric devices; lead compounds; 10 muF; 1000 h; 20 mohm; 300 V; 500 kHz; Ag-Pd alloy internal electrodes; AgPd; EIA standard; MLC; Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-Pb(Ni/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ ternary system; PbMgO/sub 3/NbO/sub 3/-PbNiO/sub 3/NbO/sub 3/-PbTiO/sub 3/; Y5U multilayer ceramic capacitors; accelerated load life tests; alkoxide process; dielectric powder material; high-specific capacitance; insulation resistance; load humidity tests; low-equivalent series resistance; temperature dependence; Capacitance; Capacitors; Ceramics; Dielectric materials; Electrodes; Insulation testing; Life testing; Niobium; Nonhomogeneous media; Powders;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
