Charge effects in donor‐doped perovskite ferroelectrics

Doping is a widely used method to tune the physical properties of ferroelectric perovskites. Since doping can induce effective charges, it is important to understand how charges affect the chemical and physical properties of the doped perovskites. Here, we propose two charge compensation models, by...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2020-09, Vol.103 (9), p.5392-5399
Main Authors: Liu, Jia, Liu, Laijun, Zhang, Jiale, Jin, Li, Wang, Dawei, Wei, Jie, Ye, Zuo‐Guang, Jia, Chun‐Lin
Format: Article
Language:English
Subjects:
atomistic simulation
Barium titanates
BaTiO3
Compensation
Dipole interactions
donor‐doping
Doping
Ferroelectric materials
Ferroelectricity
Hysteresis loops
Lanthanum
Perovskites
phase transition
Phase transitions
Physical properties
Temperature
Transition temperature
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Summary:Doping is a widely used method to tune the physical properties of ferroelectric perovskites. Since doping can induce effective charges, it is important to understand how charges affect the chemical and physical properties of the doped perovskites. Here, we propose two charge compensation models, by adding the charge‐dipole interaction to the effective Hamiltonian, which has not been done previously, and numerically investigate how lanthanum doping affects the ferroelectric phase transition temperature and the hysteresis loop in BaTiO3. The consequences of the charge compensation models are compared and discussed, revealing that the electron compensation mechanism with some Ti4+ ions changing to Ti3+ is critical to understanding the donor‐doped perovskites.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17270