Predicting short-range order and correlated phenomena in disordered crystalline materials

Area of Science:

• Materials Science
• Solid-State Chemistry
• Crystallography

Background:

• Disordered crystalline materials are crucial for energy technologies, but their atomic-scale disordering rules remain poorly understood.
• Neutron total scattering reveals atomic arrangements differ from long-range diffraction structures and are not random.
• Understanding disorder is key to predicting material properties under extreme conditions.

Purpose of the Study:

• To elucidate the fundamental atomic-scale rules governing disordering in crystalline materials.
• To demonstrate a predictive framework for understanding structural distortions in disordered materials.
• To connect short-range atomic disorder to macroscopic material behavior in energy applications.

Main Methods:

• Application of Pauling's rules to analyze heterogeneous disordering.
• Corroboration using first-principles calculations.
• Analysis of neutron total scattering data.

Main Results:

• Pauling's rules accurately explain heterogeneous disordering and associated structural distortions.
• First-principles calculations validate the predictive power of Pauling's rules for disorder.
• The study provides a framework for understanding atomic-scale changes under extreme conditions.

Conclusions:

• Pauling's rules offer a straightforward method to understand and predict atomic-scale disorder in crystalline materials.
• This insight is vital for designing materials for demanding energy applications.
• The findings advance the fundamental understanding of disorder in materials science.