مقاربة نظرية لدراسة إضافة الأنديوم على بعض الخواص الفيزيائية للمواد الشالكوجينية

Abstract EN

The present work explain the composition dependence of many physical properties in different Ge-Te-In compositions having the general formula , where The effect of indium addition on the physical properties, i.e.

coordination number, constraints, fraction of floppy modes, number of lone pair electrons, bond energy, cohesive energy, heat of atomization, ionicity, electronegativity, theoretical energy gap, density, molar volume, of bulk glassy alloys was investigated.

It was found thatThe density of the glassy alloys increases with increasing theIn content.

The molar volume of the structure of the glass was determined from measured density.

The cohesive energy of the samples has been calculated using a chemical bond approach and correlated with the decrease in the optical energy gap with increase in the In content.

The heat of atomization was also calculated and correlated with the optical energy gap.

It was observed that the band gap decreases with increasing theIn concentration in the system.

This variation in the band gap has been explained on the basis of change in structure of the system due to the introduction of In in Ge-Te-In glassy system.