1. Group for Ferroelectrics and Functional Oxides, Swiss Federal Institute of Technology in Lausanne—EPFL, 1015 Lausanne, Switzerland
2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China
3. Electronic Ceramics Department, Jožef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia