1. Grupo de Ferroelétricos e Materiais Multifuncionais, Instituto de Física, Universidade Federal de Uberlândia, Uberlândia, Brazil
2. Facultad de Física − Instituto de Ciencia y Tecnología de Materiales, Universidad de La Habana. San Lázaro y L, La Habana, Cuba
3. Multifunctional Electronic Materials and Devices Research Lab. Department of Electrical and Computer Engineering, College of Engineering, The University of Texas at San Antonio, San Antonio, TX, USA