%0 Journal Article
%T Nondestructive Evaluation of Ferroelectric Multilayer Capacitors Using Electromechanical Resonances
%A Hongtao SUN
%A Hongfang WANG
%A Liangying ZHANG
%A Xi YAO
%A <br>
%J 材料科学技术学报
%D 1995
%I 
%X Under the mechanically free and clamped boundary conditions, electromechanical resonances of ceramic multilayer capacitors are calculated using vibration and piezoelectric equations. Multilayer capacitors made of ferroelectric BaTiO3 and Pb(Mg1/3Nb2/3)O3 ceramics have been used to examine the theoretical calculation. Frequency spectra of impedance and phase angle, capacitance and loss tangent of the capacitors under dc bias fields are carefully measured. A sudden change around the resonant frequency is observed in these spectra. A damped resonance indicates a defective capacitor while an undamped resonance is corresponding to defect free.Experimental results suggest that it is possible to use the spectra as a real time nondestructive evaluation method.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=70EE36D057663306&yid=BBCD5003575B2B5F&vid=708DD6B15D2464E8&iid=0B39A22176CE99FB&sid=DDD31293A7C7D057&eid=7F5DDA4924737DF5&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=0