Perovskite Oxide Systems at High Pressures: Raman Spectroscopy and X-Ray Diffraction Studies

Basu, Abhisek (2015) Perovskite Oxide Systems at High Pressures: Raman Spectroscopy and X-Ray Diffraction Studies. PhD thesis, Indian Institute of Science Education and Research Kolkata.

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The primary focus of this thesis is the study of perovskite oxide systems at high pressures by X-ray diffraction, Raman spectroscopy and dielectric constant measurements. In this research work we report the behaviour of Sodium Tungsten bronzes; ferroelectric Lead Calcium Titanate and Barium Strontium Titanate, and multiferroic Europium doped Bismuth Iron Oxide. Pressure is an important thermodynamic variable which can be used efficiently to tune the inter-atomic spacing and induce changes in physical properties of materials. Due to its exceptional applicative properties perovskite oxides have attracted lot of attention since its discovery. Our main aim was to understand and analyze its behaviour by applying both external hydrostatic pressure and internal chemical pressure by doping. The high pressure study revealed structural transitions in the systems are accompanied by significant rotation, tilting and distortion of oxygen octahedra. The internal stress associated with the system gets released with the relaxation of the strained lattice. Through this research work we observed reappearance of high pressure ferroelectric phase from cubic paraelectric. The substitution of the A-site cation also led to changes in the transition pressure.

Item Type: Thesis (PhD)
Additional Information: Supervisor: Dr. Goutam Dev Mukherjee
Uncontrolled Keywords: High Pressure; Perovskite Oxide Systems; Raman Spectroscopy; X-Ray Diffraction
Subjects: Q Science > QC Physics
Divisions: Department of Physical Sciences
Depositing User: IISER Kolkata Librarian
Date Deposited: 13 Aug 2015 08:40
Last Modified: 13 Aug 2015 08:42

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