Naslov
THE INFLUENCE OF THERMAL TREATMENT ON THE PHASE DEVELOPMENT OF ZrO2-ZnO PRECURSORS

Autori
Štefanić, Goran ; Musić, Svetozar ; Ivanda, Mile

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
EUCMOS 2008 XXIX European Congress on Molecular Spectroscopy Book of Abstracts / Musić, Svetozar ; Ristić, Mira ; Krehula, Stjepko (ur.). - / - , 2008

Skup
EUCMOS 2008 XXIX European Congress on Molecular Spectroscopy

Mjesto i datum
Opatija, Hrvatska, 31.08.2008. - 05.09.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
ZrO2-ZnO; XRD; Raman spectroscopy; FE-SEM; FT-IR spectroscopy; DSC

Sažetak
The amorphous precursors of the ZrO2-ZnO system at the ZrO2-rich side of the concentration range were prepared by the co-precipitation from aqueous solutions of the corresponding salts. Structural and microstructural changes during thermal treatment of the amorphous precursors were examined by differential scanning calorimetry, X-ray powder diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, field emission scanning electron microscopy and energy dispersive X-ray spectrometry. The crystallization temperature of the amorphous precursors increased with an increase in the ZnO content, from 453 °C (0 mol% ZnO) to 551 °C (~25 mol% ZnO). The results of phase analysis indicated that maximum solubility of Zn2+ ions in the ZrO2 lattice (~25 mol%) occurred in the metastable products obtained after crystallization of the amorphous precursors. The incorporation of Zn2+ ions partially stabilized the tetragonal ZrO2 polymorph. A precise determination of unit-cell parameters using the whole-powder-pattern refinements shows that the unit-cell parameters of the tetragonal ZrO2 solid solution decrease with an increase of Zn2+ content. The increase of the zinc content above its solid-solubility limit causes the appearance of the phase structurally closely related to zincite. Further temperature treatment (up to 1000 °C) causes the increase of the zincite-type phase followed with the transition of metastable tetragonal ZrO2 into thermodynamically stable monoclinic ZrO2 polymorph.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA