TY - JOUR
T1 - XRD, WAXS, FTIR, and XANES studies of silica-zirconia systems
AU - Musyarofah,
AU - Soontaranon, Siriwat
AU - Limphirat, Wanwisa
AU - Triwikantoro,
AU - Pratapa, Suminar
N1 - Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.
PY - 2019/8/15
Y1 - 2019/8/15
N2 - The structural characteristics of polymorphic raw material combinations of silica-zirconia powder systems were investigated through X-ray diffraction (XRD), Wide-angle X-ray scattering (WAXS), Fourier transform infrared (FTIR), and X-ray absorption near edge structure (XANES). Stoichiometric mixtures (1:1 mol% ratio) of silica (SiO2: amorphous and cristobalite) and zirconia (ZrO2: amorphous and tetragonal zirconia) were prepared with the addition of polyvinyl alcohol (PVA) and a ball-mill mechanical activation of 5 h, followed by calcination at 1000 and 1200 °C. The identified phases of the calcined powders were a combination of zircon, zirconia, and cristobalite. Quantitative phase analyses of the XRD and WAXS data based on the Rietveld method revealed that the amorphous-amorphous (AA) mixture contained a higher zircon composition than the others, ca 93 mol%, at a calcination temperature as low as 1000 °C. Rietveld analysis of the WAXS data was in good agreement with that of the XRD data. The PVA and ball-mill mechanical activation simultaneously enhanced the solid-state reaction. The peaks of IR absorption associated with zircon were observed at wavenumbers around 435, 615, and 900 cm−1. The IR absorption peak observed at around 1000 cm−1 indicated silica-rich content in the AT1000 and CA1000 samples. A Si K-edge XANES analysis indicated a structural distortion around Si in the zircon-containing samples as compared to the silica, resulting in an “extra” lower-energy peak. The ratio between the absorption intensities of the “extra” and the highest peaks, in general, confirmed the phase composition of zircon in the samples.
AB - The structural characteristics of polymorphic raw material combinations of silica-zirconia powder systems were investigated through X-ray diffraction (XRD), Wide-angle X-ray scattering (WAXS), Fourier transform infrared (FTIR), and X-ray absorption near edge structure (XANES). Stoichiometric mixtures (1:1 mol% ratio) of silica (SiO2: amorphous and cristobalite) and zirconia (ZrO2: amorphous and tetragonal zirconia) were prepared with the addition of polyvinyl alcohol (PVA) and a ball-mill mechanical activation of 5 h, followed by calcination at 1000 and 1200 °C. The identified phases of the calcined powders were a combination of zircon, zirconia, and cristobalite. Quantitative phase analyses of the XRD and WAXS data based on the Rietveld method revealed that the amorphous-amorphous (AA) mixture contained a higher zircon composition than the others, ca 93 mol%, at a calcination temperature as low as 1000 °C. Rietveld analysis of the WAXS data was in good agreement with that of the XRD data. The PVA and ball-mill mechanical activation simultaneously enhanced the solid-state reaction. The peaks of IR absorption associated with zircon were observed at wavenumbers around 435, 615, and 900 cm−1. The IR absorption peak observed at around 1000 cm−1 indicated silica-rich content in the AT1000 and CA1000 samples. A Si K-edge XANES analysis indicated a structural distortion around Si in the zircon-containing samples as compared to the silica, resulting in an “extra” lower-energy peak. The ratio between the absorption intensities of the “extra” and the highest peaks, in general, confirmed the phase composition of zircon in the samples.
KW - Silica
KW - Structural characteristics
KW - Zircon
KW - Zirconia
UR - http://www.scopus.com/inward/record.url?scp=85065593794&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2019.05.078
DO - 10.1016/j.ceramint.2019.05.078
M3 - Article
AN - SCOPUS:85065593794
SN - 0272-8842
VL - 45
SP - 15660
EP - 15670
JO - Ceramics International
JF - Ceramics International
IS - 12
ER -