Experimental determination and thermodynamic modeling of the phase diagrams of Ge-Sb-Ag and Ge-Sb-In ternary systems.

[M. Premović]

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Metalurško inţenjerstvo-Materijali / Metallurgical Engineering-Materials

The results of experimental investigation and thermodynamic calculation of phase diagrams of Ge-Sb-Ag and Ge-Sb-In ternary systems are presented in this doctoral dissertation. Experimental part of the work includes preparation of the samples of selected compositions and their investigation using methods of differential thermal analysis (DTA), scanning electron microscopy with energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD), optical microscopy (LOM), measuring the hardness, microhardness and electric conductivity of alloys. Based on the obtained results characteristic phase transition temperatures, structural characteristics, phase compositions, mechanical properties and electric conductivity of the investigated alloys were determined. Calculation of phase diagrams of ternary Ge-Sb-Ag and Ge-Sb-In systems was performed using CALPHAD method and the corresponding thermodynamic software (Pandat ver. 8.1). Calculated results include liquidus projections, invariant reactions, characteristic vertical and isothermal sections for both investigated ternary systems.

U doktorskoj disertaciji su izloţeni rezultati eksperimentalnog ispitivanja i termodinamiĉkog proraĉuna ravnoteţnih dijagrama stanja trojnih Ge-Sb-Ag i Ge-Sb-In sistema. U eksperimentalnom delu doktorske disertacije izvršena je priprema legura odabranih sastava koje su zatim ispitivane primenom metoda diferencijalno termijske analize (DTA), skenirajuće elektronske mikroskopije sa energo-disperzivnom spektrometrijom (SEM-EDS), X-ray difraktometrije (XRD), optiĉke mikroskopije (LOM), kao i merenjem tvrdoće, mikrotvrdoće i elektroprovodljivosti. Na osnovu dobijenih rezultata utvrĊene su karakteristiĉne temperature faznih transformacija, strukturne karakteristike, fazni sastav ispitivanih legura, mehaniĉke osobine i elektroprovodljivost legura. Proraĉun ravnoteţnih dijagrama stanja Ge-Sb-Ag i Ge-Sb-In sistema je izvršen primenom CALPHAD metode i odgovarajućeg termodinamiĉkog programa (Pandat ver. 8.1). Rezultati obuhvataju proraĉunate likvidus projekcije, invarijantne reakcije, karakteristiĉne vertikalne i izotermalne preseke za oba trojna sistema.

Ge-Sb-In sistem, Ge-Sb-Ag sistem, proračun ravnotežnih dijagrama stanja, vertikalni preseci, izotermalni preseci, projekcija likvidus površine, DTA analiza, SEM-EDS analiza, XRD analiza, strukturna analiza, merenje tvrdoće, mikrotvrdoće i elektroprovodljivosti.

ternary Ge-Sb-In system, ternary Ge-Sb-Ag system, calculation of the phase diagram, vertical sections, isothermal sections, liquidus projection, DTA analysis, SEM-EDS analysis, XRD analysis, structural analysis, measuring of hardness, microhardness and electrical conductivity

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