We have studied the microstructural changes associated with the structural phase transition from a low temperature orthorhombic phase to a low-temperature tetragonal phase in metallic La2-xBaxCuO4 and insulating Nd2NiO4. Employing electron microscopy, diffraction and dark field imaging the transition was found to be similar in both systems. Below the transition temperature a fine mixture exists of both tetragonal and orthorhombic domains. Details of microstructural changes of defect networks are compound specific. A simple model is also proposed to understand the microstructural changes observed in these two systems.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering