Resistivity vs compressibility measurements techniques for study of shock induced transition

Abstract

This study investigates the influence of shock-induced transformations, focusing on compressibility and resistivity measurements at high pressure using the P.C. apparatus. The compressibility is measured via a displacement method with a lever arm arrangement, enabling accurate pressure measurement and the construction of (PV) phase diagrams to identify phase transitions. Resistivity measurements are performed using a four-probe D.C. potentiometer method, providing insights into the semiconductor to metal transitions in various compounds. The study highlights the advantages and limitations of shock wave techniques and static methods in high-pressure experiments. While static methods offer precise results for phase transitions, they are limited by pressure ranges, particularly for divalent metal oxides. In contrast, shock wave techniques can reach higher pressure ranges but involve complexities such as shear strength and temperature effects, which complicate data interpretation. The study concludes that both techniques provide valuable insights for understanding high-pressure behaviors in condensed matter.