Abstract
A Landau-Devonshire thermodynamic energy density function for ferroelectric wurtzite aluminum scandium nitride (Al1−xScxN) solid solution is developed. It is parametrized using available experimental and theoretical data, enabling the accurate reproduction of composition-dependent ferroelectric properties, such as spontaneous polarization, dielectric permittivity, and piezoelectric constants, for both bulk and thin films. The maximum concentration of Sc for the wurtzite structure to remain ferroelectric is found to be 61 at. %. A detailed analysis of Al1−xScxN thin films reveals that the ferroelectric phase transition and properties are insensitive to substrate strain. This study lays the foundation for quantitative modeling of novel ferroelectric wurtzite solid solutions.
Recommended Citation
Y. Gu et al., "A Phenomenological Thermodynamic Energy Density Function For Ferroelectric Wurtzite Al1−xScxN Single Crystals," Journal of Applied Physics, vol. 135, no. 9, article no. 094102, American Institute of Physics, Mar 2024.
The definitive version is available at https://doi.org/10.1063/5.0190677
Department(s)
Materials Science and Engineering
International Standard Serial Number (ISSN)
1089-7550; 0021-8979
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2024 American Institute of Physics, All rights reserved.
Publication Date
07 Mar 2024
Comments
National Science Foundation, Grant DMR-2133373