摘要
Ⅰ. INTRODUCTION In recent years, there has been considerable interest in semiconductor-t0-metal transitions in group Ⅳ elements and Ⅲ-Ⅳ compounds at high pressure. In 1973, Van Vechten calculated the pressure-temperature phase diagrams of group Ⅳ elements and Ⅲ-Ⅳ compounds according to the quantum dielectric theory of electronegativity