Croatica Chemica Acta, Vol. 88 No. 4, 2015.
Izvorni znanstveni članak
https://doi.org/10.5562/cca2785
Role of Sulfur as a Reducing Agent for the Transition Metals Incorporated into Lithium Silicate Glass
M. Y. Hassaan
; Physics Department, Faculty of Science, Al-Azhar University, Nasr City, 11884, Cairo, Egypt
M. M. El-Desoky
; Physics Department, Faculty of Science, Suez University, Suez, Egypt
M. G. Moustafa
; Physics Department, Faculty of Science, Al-Azhar University, Nasr City, 11884, Cairo, Egypt
Y. Iida
; Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachi-Oji, Tokyo 192-0397, Japan
S. Kubuki
; Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachi-Oji, Tokyo 192-0397, Japan
T. Nishida
; Department of Biological and Environmental Chemistry, Faculty of Human-Oriented Science and Engineering, Kinki University, Iizuka, Fukuoka 820-8555, Japan
Sažetak
Li2O·0.25Fe2O3·0.25NiO·1.5SiO2 glass was prepared with and without 5 wt % sulfur (S) while melting the mixture of the starting materials at 1350 °C for 1 h in air. A part of the as-prepared glass was heat treated for 1 h near its crystallization temperature (Tc) as determined from differential thermal analysis. Each glass was also investigated by means of Mössbauer spectroscopy, X-ray diffraction, FTIR, and DC conductivity. The Mössbauer spectra showed ionic Fe2+ and Fe3+ species in the glass as well as in the precipitated phase obtained after heat treatment. XRD patterns demonstrated the glassy phase formation in the as-quenched samples irrespective of the presence of sulfur. The heat treated samples showed different precipitated phases containing iron particles of nanometer size. The electric conductivity measurements showed that sulfur-doped samples had high values of (σ) probably because of small polaron hopping between Fe2+ and Fe3+.
Ključne riječi
Mössbauer spectroscopy; electrical conductivity; sulfur; heat treatment
Hrčak ID:
153720
URI
Datum izdavanja:
31.12.2015.
Posjeta: 1.599 *