|
|||||
|
|
Pressure dependent phase transitions in (Pb,Ca)TiO3: Determination of structure using high pressure synchrotron X-ray and Raman studies |
|
| Authors: | Amreesh Chandra A K Tyagi V Vijaykumar G D Mukherjee R Boehler |
| Affiliation: | 1. Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur, 721302, West Bengal, India 2. Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India 3. High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India 4. Department of Physics, Indian Institute of Science Education and Research, Kolkata, 700106, West Bengal, India 5. Hochdruck Mineralphysik, Max Planck Institute for Chemie, Postfach 3060, 55128, Mainz, Germany |
| Abstract: | Pressure dependent studies on technologically important ferroelectric material Pb0.70Ca0.30TiO3 show the occurrence of a new hitherto unreported pressure dependent phase transition around 4 GPa. In the pressure range 4–14 GPa, the parent tetragonal (P4mm) phase of Pb0.70Ca0.30TiO3 transforms in to a monoclinic (Cm) phase before attaining its paraelectric cubic (Pm3m) phase around 15 GPa. High pressure Raman studies reveal the presence of a critical pressure above which the ferroelectric phase starts to reappear in the paraelectric phase. This critical pressure is found to be much lower than the critical pressure observed in pure PbTiO3. Possible reasons for this lowering of the critical pressure are presented. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |
