1. Department of Physics, Saranathan College of Engineering, Anna University, Tiruchirapali, India
2. Dielectrics Research Lab, PG & Research Department of Physics, Rajah Serfoji Government College, Bharathidasan University, Thanjavur, India
3. PG & Research Department of Physics, Bishop Heber College, Bharathidasan University, Tiruchirapalli, India
4. School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded, India