[1] B V Raju Inst Technol, Dept Phys, Medak 502313, Telangana, India
[2] B V Raju Inst Technol, Dept Elect & Elect Engn, Medak 502313, Telangana, India
[3] Osmania Univ, Univ PG Coll, Dept Phys, Secunderabad 502313, Telangana, India
[4] B V Raju Inst Technol, Dept Chem, Medak 502313, Telangana, India
[5] Inst Aeronaut Engn, Hyderabad 500043, India