1. Materials Science Centre, Indian Institute of Technology, Kharagpur 721 302, India
2. Seismology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
3. High Pressure and Synchroton Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
4. Homi Bhabha National Institute, Mumbai 400094, India