School of Mechanical Engineering;
Chengdu University;
Chengdu 610106;
China;
College of Materials Science and Engineering;
Sichuan University;
Chengdu 610065;
China;
College of Architecture and Environment;
Sichuan University;
Chengdu 610065;
China;
piezoceramic resonator; radial mode; AC conductivity; resonance frequency spectra;