1. School of Engineering Indian Institute of Technology Mandi Mandi Himachal Pradesh 175005 India
2. Institute of Power Engineering Universiti Tenaga Nasional Kajang Selangor 43000 Malaysia
3. Department of Physics Faculty of Science King Khalid University P. O. Box 9004 Abha Saudi Arabia
4. Laboratoire des matériaux composites céramiques et polymères (LaMaCoP) Département de Physique Faculté des Sciences de Sfax Université de Sfax BP 805 Sfax 3000 Tunisia
5. Department of Physics Sakarya University Esentepe Campus Sakarya 54187 Turkey
6. Physics department College of Science Jouf University P. O. Box 2014 Sakaka Saudi Arabia
7. Department of Physics College of Science Princess Nourah bint Abdulrahman University P. O. Box 84428 Riyadh 11671 Saudi Arabia
8. Central Power Research Institute Dielectric Materials Division Bengaluru Karnataka 560080 India