دراسة الخواص الفيزيائية، و توصيف بنيوي باستخدام الأشعة السينية لعينات زجاج شالكوجيني ملدن من النظام GeSe2-xSnx

الملخص EN

The present work is studying the compositional dependence of some physical properties such as density and microhardness in different Ge-Se-Sn compositions having the general formula GeSe2-xSnx, where (x = 0, 0.2, 0.4, 0.6, 0.8, 1).

The studied compositions were prepared by direct fusion under vacuum followed by quenching in ice water.

The glassy state of the prepared materials was confirmed by the X-ray technique.

The densities of the as-prepared alloys were determined using the hydrostatic weighting in toluene at room temperature.

The partially substitution of the Se atoms by the heavier Sn atoms increased the density linearly.

This change in density is related to the change in the atomic weight and the atomic volume of Se and Sn.

The microhardness were determined using Vickers test at room temperature.

Increasing the Sn content is found to decrease the hardness of the studied system and transforming the structure from rigid solid to floppy polymeric glass.

The studied samples were annealed at 420 C o for 12 hr.

The X-ray investigation showed that the increase of Sn content leads to decrease the values of the relative microstrain of the examined system.

This might be due to the metallic property of the Sn element, which leads to increase the crystallinity of the examined samples by increasing the ordering of the atoms.