Author(s):
1. Mirjana Šiljegović, Prirodno-matematički fakultet u Novom Sadu, Serbia
2. Kristina Čajko, Univerzitet u Novom Sadu, Prirodno-matematički fakultet, Departman za fiziku, Serbia
3. Svetlana Lukić Petrović, Univerzitet u Novom Sadu, Prirodno-matematički fakultet, Departman za fiziku, Serbia
4. Goran Štrbac, Univerzitet u Novom Sadu, Prirodno-matematički fakultet, Departman za fiziku, Serbia
5. Dragoslav Petrović, Univerzitet u Novom Sadu, Prirodno-matematički fakultet, Departman za fiziku, Serbia

Abstract:
Semiconducting glasses of Agx(As40S30Se30)100-x (x ≤ 15 at. %) type were synthesized from high purity elementary components by the melt quenching method in a cascade heating regime. The measurements were realised using a differential scanning calorimeter (DSC), in non-isothermal regime of work at different heating rates. It was found that glasses with x  3 at.% of Ag show crystallization, whereby this process is complex and appears as double stage egzothermic reaction, and most likely it is the formation of crystalline centers As2S5 and AgAsSe2. Activation energy of crystallization Ec for the samples representing the behaviour of investigated system (x=3 and 10 at.% of Ag) was determined using the isokinetic methods of Kissinger, Mahadevan and Augis and Bennett. A significantly higher value of the Ec for the first process in glass with a higher Ag content and a significantly lower value of the Ec related to the second crystallization process are explained with the higher percentage dopant share in the matrix and the greater tendency to crystallize. Using the Ozawa method, for analyzed compositions a volume nucleation mechanism was established. By comparing the results of the use of the Šatava and Ozave-Chen methods, three-dimensional growth of crystal centers has been found.

Key words:
halkogenidi, kristalizacija, aktivaciona energija, nukleacija

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
09.10.2017.

Conference:
Contemporary Materials 2017 - Savremeni Materijali

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