1. CTS Ferroperm Piezoceramics A/S, Kvistgaard, Denmark
2. GREMAN UMR 7347, Université de Tours, CNRS, INSA CVL, Tours, France
3. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China
4. Penn State Behrend, Penn State University, Erie, PA, USA
5. Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan