Naslov
Thermal behavior of ZrO2 precursors obtained by sol-gel processing

Autori
Štefanić, Ivka ; Musić, Svetozar ; Štefanić, Goran ; Gajović, Andreja

Izvornik
Journal of molecular structure (0022-2860) 481 (1999), Special issue SI; 621-625

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

Ključne riječi
T-ZrO2 ; M-ZrO2 ; Raman ; FT-IR ; sol-gel

Sažetak
Three different zirconia precursors were synthesized from zirconium(IV)-propoxide by sol-gel processing at pH 1.5, 5.5 and 10.5. The first crystallization products, obtained after the calcination of ZrO2 precursors at 400 degrees C, contained metastable t-ZrO2 as a dominant phase. The sensitivities of metastable t-ZrO2 products to the influence of temperature (600 degrees C and 800 degrees C) or pressure (500, 1000 and 1350 MPa) were monitored by laser Raman and FT-IR spectroscopies. X-ray powder diffraction was used as a complementary technique. It was found that the pH, used during the sol-gel processing of the ZrO2 precursor strongly influenced the sensitivity of the metastable t-ZrO2 products to the influence of temperature or pressure. The most stable t-ZrO2 product was obtained from the ZrO2 precursor precipitated at pH 1.5 and the most susceptible from the precursor precipitated at pH 5.5.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA