20.500.12556/RUL-182663 Kristalinične modifikacije magnezijevega karbonata in njegovi hidrati Crystalline modifications of Magnesium carbonate and its hydrates V diplomski nalogi Kristalinične modifikacije magnezijevega karbonata in njegovih hidratov sem obravnavala sistem kristaliničnih modifikacij magnezijevega karbonata in njegovih hidratov. Namen naloge je bil celostno preučiti posamezne modifikacije ter preučiti povezave med njihovim nastankom, stabilnostjo in pretvorbami. Posamezne kristalinične modifikacije in hidrate, npr. magnezit, hidromagnezit, neskehonit in lansfordit, sem obravnavala z vidika sinteze, pretvorb in karakterizacije. Poseben poudarek je bil namenjen karakterizacijskim metodam kot so SEM, XRD, FTIR spektroskopija in termične analize (TG, DTG in DTA), s katerimi je mogoče prepoznati značilnosti posameznih faz. Ugotovila sem, da je sistem MgO-CO$_2$-H$_2$O, v katerem nastajajo posamezne faze magnezijevega karbonata, precej kompleksen in da na nastanek posamezne faze močno vplivajo reakcijski pogoji, kot so temperatura, parcialni tlak CO$_2$, pH in aktivnost vode. Sistem obsega številne manj stabilne oziroma metastabilne faze, ki se lahko že ob manjših spremembah pogojev pretvarjajo v stabilnejše oblike. Pomembno vlogo ima tudi amorfni magnezijev karbonat, ki je manj stabilna faza, vendar sodeluje pri nastanku in pretvorbah v druge modifikacije. Na podlagi obširnega pregleda literature sklepam, da je za razumevanje sistema kristaliničnih modifikacij magnezijevega karbonata in njegovih hidratov pomembna celostna obravnava sintez, njenih pogojev, stabilnosti in pogojev pretvorb intermediatov ter karakterizacije posameznih faz. In my bachelor`s thesis Crystalline Modification of Magnesium Carbonate and it`s Hydrates, I examined the system of crystalline modifications of magnesium carbonate and it`s hydrates. The aim of the thesis was to comprehensively study individual modifications and to investigate the relationships between their formation, stability, and transformations. I examined individual crystalline modifications and hydrates, including magnesite, hydromagnesite, nesquehonite, and lansfordite, from the perspective of synthesis, transformation, and characterisation. Special emphasis was placed on characterisation methods such as SEM, XRD, FTIR spectroscopy, and thermal analyses (TG, DTG, and DTA), which can be used to identify the characteristics of individual phases. I found that the MgO-CO$_2$-H$_2$O system, within which individual phases of magnesium carbonate form, is quite complex and that the formation of individual phases is strongly influenced by experimental conditions such as temperature, CO$_2$ partial pressure, pH, and water activity. The system comprises numerous less stable or metastable phases that can transform into more stable phases even with minor changes in conditions. Amorphous magnesium carbonate also plays an important role; although it is less stable phase, it participates in the formation and transformation into other modifications. Based on the literature review, it can be concluded that a comprehensive consideration of individual phases is essential for understanding the system of crystalline modification of magnesium carbonate and its hydrates. magnezijev karbonat kristalinične modifikacije hidrati fazne pretvorbe karakterizacijske metode magnesium carbonate crystalline modifications hydrates phase transformations characterisation methods true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-05-20 12:20:03 2026-05-20 12:20:12 2026-05-22 06:13:54 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 25655 278993667 Skufca_Spela_-_Kristalinicne_modifikacije_magnezijevega_karbonata_in_njegovi_hidrati.pdf Skufca_Spela_-_Kristalinicne_modifikacije_magnezijevega_karbonata_in_njegovi_hidrati.pdf 1 9B34437A837027885BA6736B1F63789E 5e3c478c26048d6e37e150d137d075c555c51dae497129d3ef108250dbcbb107 2a715e84-5435-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=234125 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0