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master's thesis
Određivanje udjela amorfne faze u manganitima
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2023. urn:nbn:hr:149:431299
Jakopović, Valentina
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

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Jakopović, V. (2023). Određivanje udjela amorfne faze u manganitima (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:431299

Jakopović, Valentina. "Određivanje udjela amorfne faze u manganitima." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2023. https://urn.nsk.hr/urn:nbn:hr:149:431299

Jakopović, Valentina. "Određivanje udjela amorfne faze u manganitima." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2023. https://urn.nsk.hr/urn:nbn:hr:149:431299

Jakopović, V. (2023). 'Određivanje udjela amorfne faze u manganitima', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 20 December 2024, https://urn.nsk.hr/urn:nbn:hr:149:431299

Jakopović V. Određivanje udjela amorfne faze u manganitima [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2023 [cited 2024 December 20] Available at: https://urn.nsk.hr/urn:nbn:hr:149:431299

V. Jakopović, "Određivanje udjela amorfne faze u manganitima", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2023. Available at: https://urn.nsk.hr/urn:nbn:hr:149:431299

Metadata
TitleOdređivanje udjela amorfne faze u manganitima
Title (english)Determination of amorphous phase content in manganites
AuthorValentina Jakopović
MentorJelena Macan (mentor)
Committee memberJelena Macan (predsjednik povjerenstva)
Committee memberJuraj Šipušić (član povjerenstva)
Committee memberKrunoslav Žižek (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2023-07-10, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
Kristale karakterizira uređena kristalna struktura, dok amorfne tvari nemaju uređenu strukturu. Razlika između amorfnih i kristalnih tvari je u stupnju prostorne uređenosti, ali i u brojim fizikalnim svojstvima. Amorfna faza utječe na fizikalna svojstva mnogih materijala poput funkcionalne keramike (perovskiti), farmaceutika, građevinskih materijala itd. Kod perovskita, prisutnost amorfne faze utječe na katalitička svojstva. Cilj ovog rada bio je razviti pouzdanu tehniku za kvantificiranje amorfne faze u uzorcima lantanovog (LaMnO3), kalcijevog (CaMnO3) i barijevog (BaMnO3) manganita. Korišteni uzorci manganita pripremljeni su limunskim i koprecipitacijskim postupkom u prethodnim istraživanjima, a u svrhu određivanja udjela amorfne faze u njih je umiješano 10 % Al2O3 (korunda) kao standarda. Snimljeni su difraktogrami pripremljenih uzoraka te je proveden postupak Rietveldove metode utočnjavanja u besplatnom softverskom paketu FullProf. Isti postupak je zatim primijenjen za određivanje porasta udjela amorfne faze u La0,8Sr0,2MnO3 uzorku pripremljenom koprecipitacijskim postupkom i podvrgnutom naknadnom usitnjavanju u planetarnom mlinu. Na temelju dobivenih rezultata utvrđeno je da ovakva tehnika za kvantificiranje udjela amorfne faze pouzdana i jednostavna.
Abstract (english)
Crystals are characterized by an ordered crystalline structure, while amorphous substances do not have an ordered structure. The difference between amorphous and crystalline substances is in the degree of spatial arrangement, but also in numerous physical properties. The amorphous phase affects the physical properties of many materials such as functional ceramics (perovskites), pharmaceuticals, construction materials, etc. In perovskites, the presence of the amorphous phase affects catalytic properties. The aim of this work was to develop a reliable technique for quantifying the amorphous phase content in samples of lanthanum (LaMnO3), calcium (CaMnO3) and barium (BaMnO3) manganites. The used manganites samples were prepared in previous studies, and to determine the amorphous phase content 10 % of Al2O3 (corundum) as standard was mixed with manganites. The diffractograms of prepared samples were recorded and Rietveld refinement was done using the open-source FullProf software. The same procedure was then applied for the determination of amorphous phase content increase in La0.8Sr0.2MnO3 sample prepared by coprecipitation and then ground by ball milling. Based on the obtained results, this technique for quantifying the amorphous phase was found to be reliable and simple.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:431299
Study programmeTitle: Chemical Engineering - Graduate study
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2023-07-26 14:49:29