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Thermal behavior of the amorphous precursors of the ZrO2-SnO2 system


Štefanić, Goran; Musić, Svetozar; Ivanda, Mile
Thermal behavior of the amorphous precursors of the ZrO2-SnO2 system // Materials research bulletin, 43 (2008), 11; 2855-2871 doi:10.1016/j.materresbull.2007.12.016 (međunarodna recenzija, članak, znanstveni)


Naslov
Thermal behavior of the amorphous precursors of the ZrO2-SnO2 system

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

Izvornik
Materials research bulletin (0025-5408) 43 (2008), 11; 2855-2871

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Oxides ; X-ray diffraction ; Raman spectroscopy ; electron microscopy ; crystal structure ; microstructure

Sažetak
Thermal behavior of the amorphous precursors of the ZrO2-SnO2 system on the ZrO2-rich side of the concentration range, prepared by co-precipitation from aqueous solutions of the corresponding salts, was monitored using differential thermal analysis, X-ray powder diffraction, Raman 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 SnO2 content, from 405°C (0 mol% SnO2) to 500°C (40 mol% SnO2). Maximum solubility of Sn4+ ions in the ZrO2 lattice (~25 mol%) occurred in the metastable products obtained upon crystallization of the amorphous precursors. A precise determination of unit-cell parameters, using both Rietveld and Le Bail refinements of the powder diffraction patterns, shows that the incorporation of Sn4+ ions causes an asymmetric distortion of the monoclinic ZrO2 lattice. The results of phase analysis indicate that the incorporation of Sn4+ ions has no influence on the stabilization of cubic ZrO2 and negligible influence on the stabilization of tetragonal ZrO2. Partial stabilization of tetragonal ZrO2 in products having a tin content above its solid-solubility limit was attributed to the influence of ZrO2-SnO2 surface interactions. In addition to phases closely structurally related to cassiterite, monoclinic ZrO2 and tetragonal ZrO2, a small amount of metastable ZrSnO4 phase appeared in the crystallization products of samples with 40 and 50 mol% of SnO2 calcined at 1000° C. Further temperature treatments caused a decrease in and disappearance of metastable phases. The results of the micro-structural analysis show that the sinterability of the crystallization products significantly decreases with an increase in the SnO2 content.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija



POVEZANOST RADA


Projekt / tema
098-0982904-2898 - Fizika i primjena nanostruktura i volumne tvari (Mile Ivanda, )
098-0982904-2952 - Sinteza i mikrostruktura metalnih oksida i oksidnih stakala (Mira Ristić, )

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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