hrcak mascot   Srce   HID

Pregledni rad

Factors Influencing the Stability of Low Temperature Tetragonal ZrO2

Goran Štefanić ; Division of Materials Chemistry, Ruđer Bošković Institute, P O. Box 180, 10002 Zagreb, Croatia
Svetozar Musić ; Division of Materials Chemistry, Ruđer Bošković Institute, P O. Box 180, 10002 Zagreb, Croatia

Puni tekst: engleski, pdf (263 KB) str. 727-767 preuzimanja: 345* citiraj
APA 6th Edition
Štefanić, G. i Musić, S. (2002). Factors Influencing the Stability of Low Temperature Tetragonal ZrO2. Croatica Chemica Acta, 75 (3), 727-767. Preuzeto s https://hrcak.srce.hr/129319
MLA 8th Edition
Štefanić, Goran i Svetozar Musić. "Factors Influencing the Stability of Low Temperature Tetragonal ZrO2." Croatica Chemica Acta, vol. 75, br. 3, 2002, str. 727-767. https://hrcak.srce.hr/129319. Citirano 07.03.2021.
Chicago 17th Edition
Štefanić, Goran i Svetozar Musić. "Factors Influencing the Stability of Low Temperature Tetragonal ZrO2." Croatica Chemica Acta 75, br. 3 (2002): 727-767. https://hrcak.srce.hr/129319
Harvard
Štefanić, G., i Musić, S. (2002). 'Factors Influencing the Stability of Low Temperature Tetragonal ZrO2', Croatica Chemica Acta, 75(3), str. 727-767. Preuzeto s: https://hrcak.srce.hr/129319 (Datum pristupa: 07.03.2021.)
Vancouver
Štefanić G, Musić S. Factors Influencing the Stability of Low Temperature Tetragonal ZrO2. Croatica Chemica Acta [Internet]. 2002 [pristupljeno 07.03.2021.];75(3):727-767. Dostupno na: https://hrcak.srce.hr/129319
IEEE
G. Štefanić i S. Musić, "Factors Influencing the Stability of Low Temperature Tetragonal ZrO2", Croatica Chemica Acta, vol.75, br. 3, str. 727-767, 2002. [Online]. Dostupno na: https://hrcak.srce.hr/129319. [Citirano: 07.03.2021.]

Sažetak
Various factors that influence the appearance of a tetragonal (t-) ZrO2 polymorph at room temperature have been extensively investigated. Several proposed models emphasize the role of anionic impurities (SO42-, OH-), crystallite size (surface energy), structural similarities between the starting material and t-ZrO2, lattice strains, water vapor, lattice defects (oxygen vacancies), etc. Our investigations, focused on the stability of low temperature t-ZrO2, showed that, regardless of the structural differences in the starting zirconium materials, their thermal decomposition products crystallized into a metastable t-ZrO2. The t-ZrO2 -> m-ZrO2 transforma-tion occurred during the cooling or further calcination in the pres-ence of air at atmospheric pressure. On the other hand, if these processes are performed in vacuum, the metastable phase is pre-served. These observations indicate that a metastable t-ZrO2 appears at room temperature as a result of stabilization caused by introduction of oxygen vacancies, similarly as in the solid Solutions with aliovalent cations. A decrease in the specific surface area of ZrO2 grains or the presence of the substances that enter into strong surface interactions with ZrO2 (SO42-, Cr2O3) prevents the diffusion of oxygen from the atmosphere into the ZrO2 lattice and due to this fact the metastable t-ZrO2 is stabilized. On the other hand, lattice strain and grain size of metastable t-ZrO2 could not be clearly related to its stability.

Ključne riječi
t-ZrO2; m-ZrO2; hydrous zirconia; oxygen vacancies; lattice strain; XRD; DSC

Hrčak ID: 129319

URI
https://hrcak.srce.hr/129319

Posjeta: 575 *