Phase Transition in Mixed Transition Metal Oxides under High Pressure

Mixed crystals can be categorized as the crystal in which two or more different types of atoms are present and configured. These atoms interact each other in the influence of Coulomb force of attraction and the presence of short range repulsion force. Due to this interaction they tends to be arranged in equilibrium state and forms new material. A pure crystal can be doped by impurities with proper concentration of impurity to get the desired material. This concept of interaction between the atoms are called the Three Body Interaction(TBI) model. This model is based on the concept of interaction between atoms. The presence of short range repulsion force between the atoms is very crucial, in the absence of which coulomb force of attraction will be dominant and it will lead to volume collapse. Applying of high pressure on the crystal results in the transfer of charge between the atoms. This transfer of charge causes them to rearrange in some different cofigurational state different from original configuration. This rearrangement of atoms affects the different properties of material like hardness, melting point, optical properties and mechanical properties.