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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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A new order parameter model for the structural phase transitions in VO2-based solid solutions.
Il Hwan Kim1, Jong Song Ri1, Un Ik Kang1
1Department of Physics, Kim Hyong Jik University of Education, Dongdaewon district, Pyongyang, Democratic People's Republic of Korea.
Acta Crystallographica. Section A, Foundations and Advances
|December 2, 2025
Summary
A new two-component order parameter model effectively describes VO2 phase transitions. This model, using a two-dimensional irreducible representation, accurately predicts experimental data for VO2 and its solid solutions.
Area of Science:
- Materials Science
- Solid-State Physics
- Crystallography
Background:
- Vanadium dioxide (VO2) exhibits complex structural phase transitions.
- Existing models struggle to fully capture the observed transitions in VO2 and its solid solutions.
Purpose of the Study:
- To propose a novel two-component order parameter model for describing VO2 structural phase transitions.
- To identify ordered phases and their symmetry characteristics.
- To develop effective Landau potential models for phenomenological studies.
Main Methods:
- Development of a two-component order parameter model.
- Identification of 102 ordered phases using irreducible representations of star channel groups.
- Application of Landau potential theory with invariant groups.
- Theoretical construction of phase diagrams using an eighth-order Landau potential model.
Main Results:
- The two-component order parameter model is more effective than four-component models for VO2 transitions.
- 102 ordered phases were identified and characterized by image group invariants.
- Structurally stable Landau potential models were suggested.
- Theoretical phase diagrams showed good agreement with experimental V1-xAlxO2 data.
Conclusions:
- The proposed two-component order parameter model provides a superior description of VO2 phase transitions.
- The methodology successfully predicts and characterizes complex structural changes in VO2-based materials.
- The developed Landau potential models offer a robust framework for future phenomenological investigations.
Keywords:
VO2-based solid solutionsorder parameterstructural phase transitionsstructurally stable Landau potential modelsymmetrytemperature–concentration phase diagramwavevector star channel groupsMore Related Videos
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