Polymorphic phase transition in BaTiO3 by Ni doping
- Authors
- Nguyen Xuan Duong; Bae, Jong-Seong; Jeon, Jongchul; Lim, So Yeon; Oh, Soo Han; Ullah, Aman; Sheeraz, Muhammad; Choi, Jin San; Ko, Jae-Hyeon; Yang, Sang Mo; Kim, Kyou-Hyun; Kim, Ill Won; Ahn, Chang Won; Kim, Tae Heon
- Issue Date
- Sep-2019
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Structural phase transition; BaTiO3; Oxygen vacancy; X-ray photoelectron spectroscopy
- Citation
- CERAMICS INTERNATIONAL, v.45, no.13, pp 16305 - 16310
- Pages
- 6
- Journal Title
- CERAMICS INTERNATIONAL
- Volume
- 45
- Number
- 13
- Start Page
- 16305
- End Page
- 16310
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/2860
- DOI
- 10.1016/j.ceramint.2019.05.156
- ISSN
- 0272-8842
1873-3956
- Abstract
- We demonstrate a phase transition between BaTiO3 polymorphs induced by Ni substitution experimentally. The structural evolution of tetragonal-to-hexagonal polymorph in Ni-doped BaTiO3 ceramics is observed macroscopically and then, visualized in an atomic scale. Under this structural transition, the long-range ferroelectric ordering in the undoped BaTiO3 with tetragonal symmetry is suppressed and eventually, vanishes in the heavily Ni-doped BaTiO3 with hexagonal symmetry and dielectricity. An oxygen vacancy defect can be created at a local Ni doping site with a decrease in the charge valence state from Ti4+ (3d(0)) to Ti3+ (3d(1)). With the reduction of the TO4+ oxidation state, the polar Ti-O ionic displacement is degenerated in the tetragonal BaTiO3 and thereby, the short-range Coulomb repulsion may be restored in the hexagonal BaTiO3 resulting in a polymorphic phase transition. Our work is of potential interest for artificial realization of an exotic phase in complex oxide materials by doping.
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