Naslov
Structural features of iron-phosphate glass

Autori
Reis, Signo T. ; Pontuschka, Walter M. ; Moguš-Milanković, Andrea ; Partiti, Carmen S.M.

Izvornik
Journal of the American Ceramic Society (0002-7820) 100 (2017), 5; 1976-1981

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

Ključne riječi
diffraction and scattering measurements ; Mossbauer effect and spectroscopy ; phosphate glasses

Sažetak
This paper reports a study and discusses the role of Fe ions in the inhibition of corrosion of iron phosphate glasses. The structure of the 40Fe2O3–60P2O5 (mol%) glass, having a confirmed dissolution rate in aqueous solution at 90°C superior to borosilicate glasses, was investigated. Samples were crystallized at characteristic temperatures defined by differential thermal analysis and analyzed by X-ray diffraction. Crystalline phases of Fe2Fe[P2O7]2 and Fe4[P2O7]3 were detected. The hyperfine parameters from the M€ossbauer spectrum indicate that both Fe2+ and Fe3+ ions are in octahedral coordination, and 18% of the Fe3+ ions in the starting batch are reduced to Fe2+ ions after melting. The broad and symmetric spectra centered in g
=2.0 from the EPR measurements indicate the presence of two or more Fe interacting ions occupying sites of relatively high local symmetry.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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