In-situ thermal phase transition and structural investigation of ferroelectric tetragonal barium titanate nanopowders with pseudo-cubic phase
- Kim, Dong Hyun; Lee, Seung Jun; Theerthagiri, Jayaraman; Choi, Moonhee; Jung, Jongsuk; Yu, Yiseul; Im, Kwang Seop; Jung, Hyeon Jin; Nam, Sang Yong; Choi, Myong Yong
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- Barium titanate; In-situ high temperature X-ray diffraction; Phase transition; Rietveld refinement; Thermal evolution
- CHEMOSPHERE, v.283
- Journal Title
- Optimization and miniaturization of existing electronic devices require the development of advanced nano-structured materials with high phase and structural purity. Over the past decade, barium titanate (BaTiO3) has attracted considerable attention due to its outstanding ferroelectric and dielectric properties. The present study involved the investigation of the phase transition and structural stability of tetragonal BaTiO3 nanopowders with pseudo-cubic phase using an in-situ high resolution and high temperature X-ray diffraction method. Under ambient conditions, the coexistence the tetragonal and cubic phases with weight fractions of 75.7% and 24.3%, respectively, was determined in BaTiO3. In the temperature range of 25 degrees C-300 degrees C, phase boundaries of BaTiO3 (180 nm in size) exhibiting several phases were detected. The phase transformation behavior, relative crystal phase content, lattice parameters, crystallite size, and tetragonality of the BaTiO3 nanopowders were established by the Rietveld refinement method at the onset temperature from 25 degrees C to 300 degrees C. Up to 150 degrees C, the nanopowders exhibited a complete transition of the cubic phase. Additionally, a complete tetragonal to cubic transformation was accomplished by a decrease of tetragonality at 125 degrees C and an increase in the crystallite size at 300 degrees C.
- Files in This Item
- There are no files associated with this item.
- Appears in
- 자연과학대학 > 화학과 > Journal Articles
- 공학계열 > Dept.of Materials Engineering and Convergence Technology > Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.