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doctoral thesis
Novi pogledi na mehanizme električnoga prijenosa u ionsko-polaronskim staklima
Zagreb: University of Zagreb, Faculty of Science, 2020. urn:nbn:hr:217:577555
Nikolić, Juraj
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

Cite this document

Nikolić, J. (2020). Novi pogledi na mehanizme električnoga prijenosa u ionsko-polaronskim staklima (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:577555

Nikolić, Juraj. "Novi pogledi na mehanizme električnoga prijenosa u ionsko-polaronskim staklima." Doctoral thesis, University of Zagreb, Faculty of Science, 2020. https://urn.nsk.hr/urn:nbn:hr:217:577555

Nikolić, Juraj. "Novi pogledi na mehanizme električnoga prijenosa u ionsko-polaronskim staklima." Doctoral thesis, University of Zagreb, Faculty of Science, 2020. https://urn.nsk.hr/urn:nbn:hr:217:577555

Nikolić, J. (2020). 'Novi pogledi na mehanizme električnoga prijenosa u ionsko-polaronskim staklima', Doctoral thesis, University of Zagreb, Faculty of Science, accessed 29 December 2024, https://urn.nsk.hr/urn:nbn:hr:217:577555

Nikolić J. Novi pogledi na mehanizme električnoga prijenosa u ionsko-polaronskim staklima [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Science; 2020 [cited 2024 December 29] Available at: https://urn.nsk.hr/urn:nbn:hr:217:577555

J. Nikolić, "Novi pogledi na mehanizme električnoga prijenosa u ionsko-polaronskim staklima", Doctoral thesis, University of Zagreb, Faculty of Science, Zagreb, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:217:577555

Metadata
TitleNovi pogledi na mehanizme električnoga prijenosa u ionsko-polaronskim staklima
Title (english)New insights into electrical transport mechanisms in ion-polaron glasses
AuthorJuraj Nikolić
MentorAndrea Moguš-Milanković (mentor)
Committee memberVišnja Vrdoljak (predsjednik povjerenstva)
Committee memberAna Šantić (član povjerenstva)
Committee memberKrešimir Molčanov (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2020-07-09, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Universal decimal classification
(UDC)		54 - Chemistry. Crystallography. Mineralogy
Abstract
U ovoj doktorskoj disertaciji istražen je utjecaj zamjene Li2O, Na2O i Ag2O s WO3 odnosno MoO3 na strukturu, električna/dielektrična svojstva i promjenu mehanizama električne vodljivosti, ionske i polaronske, u cink fosfatnim stakalima. Strukturne su promjene istražene Ramanovom spektroskopijom, a (di)električna svojstva impedancijskom spektroskopijom. Strukturna su istraživanja pokazala da dodatkom WO3 dolazi do ugradnje WO6 oktaedarskih jedinica u staklo te do pojave klasteriranja, dok ugradnjom MoO3 nastaje trodimenzijska molibdensko-fosfatna strukturna mreža bez klasteriranja molibdenskih jedinica. Rezultati impedancijske spektroskopije pokazali su da dodatkom WO3 u stakla dolazi do pojave minimuma vrijednosti električne provodnosti. S druge strane, dodatkom MoO3 dolazi do blagog rasta (Li2O i Na2O serije) ili pada (Ag2O serija) vrijednosti provodnosti uz porast provodnosti tek za 60Mo polaronsko staklo. Analizom kompleksnih impedancijskih ravnina i postupkom skaliranja spektara električne provodnosti utvrđena je prisutnost ionskog i polaronskog mehanizma vodljivosti u staklima u koje je dodan WO3.
Abstract (english)
This thesis studies structural and electrical changes which occur due to replacement of Li2O, Na2O and Ag2O by WO3 and MoO3 in zinc phosphate glasses. This study focuses on mechanisms of electrical conductivity, ionic and polaronic, as a result of the oxide replacement. Raman spectroscopy was used to determine the glass structure whereas electrical properties were investigated using impedance spectrosopy. Structural studies have revealed that adding WO3 to phosphate network causes incorporation of WO6 units and formation of clusters in phosphate network, while addition of MoO3 forms three-dimensional molybdenum-phosphate glass network without clustering of molybdenum units. Results of impedance spectroscopy have shown that addition of WO3 into the phosphate network causes a minimum in electrical conductivity while adding MoO3 causes minor increase (Li2O and Na2O series) or a decrease (Ag2O series) in electrical conductivity, showing increase only for polaronic 60Mo glass. Presence of both ionic and polaronic mechanisms of electrical conductivity in tungstate glasses was confirmed by analysis of complex impedance planes and scaling of conductivity spectra.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:577555
Promotion2020
Study programmeTitle: Doctoral study in chemistry
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija (doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija)
Type of resourceText
Extent130 str. ; 30 cm
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-07-17 09:08:52