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Local Strain Triggers Polymorphic Phase Transformation in Layered Materials: A Case Study of Lead Oxide
Udupa Sujit Manjunatha1, Shibu Meher1, Pragyan Tripathi1
1Materials Research Centre, Indian Institute of Science, Bangalore, India.
Small (Weinheim an Der Bergstrasse, Germany)
|March 10, 2026
Summary
Scientists discovered how to control crystal phases in 2D materials like lead oxide (PbO) by understanding atomic-scale mechanisms. Strain engineering, using applied pressure, predictably creates nanoscale domains for advanced materials.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Physics
Background:
- Manipulating crystal phases in 2D materials is crucial for advanced electronic and catalytic devices.
- Understanding the atomic-scale mechanisms of nanoscale transformations is a significant challenge.
Purpose of the Study:
- To investigate local phase transitions in polymorphic layered lead oxide (PbO).
- To reveal the atomic-scale mechanisms driving these transformations.
- To establish strain engineering as a tool for designing nanoscale phase domains.
Main Methods:
- Atomic-resolution electron microscopy
- Computational simulations
- Applied pressure experiments
Main Results:
- Localized orthorhombic domains in PbO originate from strain relaxation around crystal defects.
- These domains are responsible for the material's characteristic structural patterns.
- Applied pressure successfully induced the same phase transformation.
Conclusions:
- Strain engineering is a potent and predictable method for designing nanoscale phase domains.
- This offers a novel, composition-preserving strategy for tailoring material properties.
- The findings advance the development of next-generation electronic and catalytic devices.
