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https://open.uns.ac.rs/handle/123456789/29024
Nаziv: | Karakterizacija termoindukovanih procesa i strukturne jedinice u nekim halkogenidnim staklima Characterization of thermally induced processe and structural units in some chalcogenide glasses |
Аutоri: | Štrbac Goran | Ključnе rеči: | Halkogenidna stakla, diferencijalno skenirajuća kalorimetrija, Ramanova spektroskopija, kristalizaciona kinetika, termička stabilnost;Chalcogenide glasses, Differential scanning calorimetry, diferencial scaning calorimetry, Raman spectroscopy, crystallization kinetics, thermal stability | Dаtum izdаvаnjа: | 19-јун-2013 | Izdаvаč: | Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu University of Novi Sad, Faculty of Sciences at Novi Sad |
Sažetak: | <p>Predmet istraživanja u okviru doktorske teze je uticaj prisustva metala ili metaloida u amorfnim sistemima As-S(Se)-I na termoindukovane procese i strukturne jedinice u njihovoj mreži. Pokazano je da, u zavisnosti od halkogenidnog sistema, različiti primesni atomi različito reaguju i ugrađuju se u matricu stakla formiranjem različitih strukturnih jedinica. U tom smislu, izabrani su binarni i kvazibinarni preseci klasičnih halkogenidnih sastava i ispitivan je, s jedne strane, uticaj izmene srodnih hemijskih elemenata (As-Sb), a s druge, uvođenje Cu i Fe u amorfnu matricu na ispitivana svojstva. Zamena As i Sb vršena je u okviru sistema Sb<sub>x</sub>As<sub>37-x</sub>S<sub>48</sub>I<sub>15</sub>. Bakar je uvođen u amorfnu matricu As<sub>2</sub>Se<sub>3</sub>, tako da su analizirane promene ispitivanih osobina sa promenom sastava stakla iz sistema Cu<sub>x</sub>(As<sub>2</sub>Se<sub>3</sub>)<sub>100-x</sub>. Ponašanje atoma Fe ispitivano je u okviru sistema Fe<sub>x</sub>[(Sb<sub>2</sub>S<sub>3</sub>)<sub>0.75</sub>(SbI<sub>3</sub>)<sub>0.25</sub>]<sub>100-x</sub>. DSC merenjima pri različitim brzinama zagrevanja izvršena je kvalitativna i kvantitativna karakterizacija termoindukovanih procesa u smislu određivanja temperatura na kojima se ovi procesi odvijaju, odgovarajućih promena specifičnog toplotnog kapaciteta pri razmekšavanju, mehanizama kristalizacije i kristalnog rasta, vrednosti Avramijevog parametra, vrednosti parametara termičke stabilnosti i energetski efekti svih procesa, detekcija prisutnih strukturnih jedinica. Ramanova spektroskopija potvrdila je prisustvo detektovanih <span style="font-size: 12px;">strukturnih jedinica i promene u strukturi i na taj način dopunila rezultate </span>termičkih merenja. U krajnjoj istanci određeno je kako uvođenje prelaznog metala ili metaloida utiče na tok i vrstu faznih transformacija u staklu, kakvi mehanizmi ugrađivanja primesnih atoma u amorfnu matricu postoje i kako je taj mehanizam uslovljen prirodom primesnih atoma i same matrice.</p> <p>Subject of research in the doctoral thesis is the effect of the metal or metalloid in As-S (Se)-I amorphous systems onto thermally induced processes and the structural units intheir network. It is shown that, depending on the chalcogenide system, different admixtures atoms react differently and are embedded in a glass matrix by formation of different structural units. In this regard, binary and quasi-binary sections of classical chalcogenide compositions are chosen and investigated, on the one hand, the impact of substitution of similar chemical elements (As-Sb), and on the other hand, the introduction of Cu and Fe in the amorphous matrix of the investigated properties. As and Sb substitution is performed within the Sb<sub>x</sub>As<sub>37- x</sub>S<sub>48</sub>I<sub>15</sub>system. Copper is introduced into an As<sub>2</sub>Se<sub>3 </sub>amorphous matrix, so that the investigated properties are analyzed depending on the composition changes in the system Cu<sub>x</sub>(As<sub>2</sub>Se<sub>3</sub>)<sub>100-x</sub>. The behavior of Fe atoms is studied in the Fe<sub>x</sub>[(Sb<sub>2</sub>S<sub>3</sub>)<sub>0.75</sub>(SbI<sub>3</sub>)<sub>0.25</sub>]<sub>100-x </sub>system. DSC measurements at different heating rates are used to performed qualitative and quantitative characterization of thermally induced process in terms of determining the temperatures at which these processes take place, corresponding changes of the specific heat capacity at the glass transition, crystallization mechanism and crystal growth, value of the Avrami parameter, the values of thermal stability parameter and energy effects of all processes, the detection of structural units present. Raman spectroscopy confirmed the presence of detected structural units and changes in the structure and thus complemented the results of thermal measurements. Finally, it is determined that the introduction of transition metals or metalloids influence the course of the phase transformation in the glass, the mechanisms of incorporation of doping atoms in the amorphous matrix and that there is a mechanism that depends on the nature of the doping atoms and the matrix. </p> |
URI: | https://open.uns.ac.rs/handle/123456789/29024 |
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prоvеrеnо 10.05.2024.
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