State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China;
Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104-6272 USA;
State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China;
Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104-6272 USA;
State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China;
nanoceramic; ferroelectric; piezoelectric; barium titanate; size effe;