Naslov
In situ high temperature study of ZrO2 ball-milled to nanometre sizes

Autori
Gajović, Andreja ; Furić, Krešimir ; Štefanić, Goran ; Musić, Svetozar

Izvornik
Journal of molecular structure (0022-2860) 744-747 (2005); 127-133

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

Ključne riječi
ZrO2 ; high-energy ball-milling ; nanostructured ; high temperature sintering

Sažetak
Nanostructured ZrO2 was prepared by high-energy ball-milling at different conditions and sintered at high temperatures. Structural and microstructural changes during the ball-milling were monitored using Raman spectroscopy (RS), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). The sintering process was monitored in situ at high temperature (300 to 1400  C) by RS and XRD. The results of RS showed that the ball-milling had very small or no influence on the transition from starting monoclinic ZrO2 to high-temperature tetragonal ZrO2. It was concluded that partial transition from monoclinic to tetragonal polymorph, observed in some previous ball-milling experiments, can be attributed to the stabilizing influence of impurities introduced due to the wearing of the milling media. In the present experiment ZrO2 ball-milling assembly was used, which reduced the influence of an additional material. The results of line broadening analysis, performed using Rietveld refinements of the ball-milling products with powder-to-ball weight ratio (R) 1:10, indicated a decrease of the crystallite size and increase of the microstrains with an increase of the ball-milling time up to 3 h. Further increase of the ball-milling time up to 10 h had very small influence on the size and strain of the obtained m- ZrO2 products. A difference between the results of in situ RS and XRD analysis of the samples subjected to prolonged ball- milling was attributed to the chemical and microstractural differences between the surface and bulk of the ZrO2 particles during the sintering at high temperatures.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

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