1991/01/01 by Nitin P. Padture, Padture, Nitin P., L. David Pye +1
Engineering · Materials Science · #660 #Clay minerals and soil interactions #Glass properties and applications #Metallic Glasses and Amorphous Alloys
paper · doi:10.34657/14080
openalex publication_date 1991/01/01 · openalex created_date 2016/10/07 · openalex updated_date 2026/07/01
An extensive region of glass formation and liquid immiscibility have been found in the Y<sub>2</sub>O<sub>3</sub>-Fe<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> system. The glass transition and crystallization temperatures were determined for selected single phase glasses in this system. The glass transition temperature and the stability of the glass were found to decrease with increasing concentration of Fe<sub>2</sub>O<sub>3</sub>. Mössbauer spectroscopy, infrared spectroscopy and transmission electron microscopy were used to obtain an insight into the structure of these glasses. Infrared and Mössbauer spectra indicate that, similar to the Y<sub>2</sub>O<sub>3</sub>-Al<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> system, glasses in the above system contain (FeB<sub>2</sub>O<sub>6</sub>)<sub>∞</sub> chains composed of FeO<sub>4</sub>-tetrahedral and BO<sub>3</sub>-triangular structural units. Hyperfine splitting phenomena were observed in the Mössbauer spectra of glasses containing high Fe<sub>2</sub>O<sub>3</sub> concentrations. The appearance of such hyperfine lines, and the decrease in the isomer shift with increasing Fe<sub>2</sub>O<sub>3</sub> content, suggest formation of iron-rich microclusters, which is supported by the presence of microstructure at a very fine scale. Glasses with increasing Y<sub>2</sub>O<sub>3</sub> concentration showed a decrease in the isomer shift and quadrupole spliting. Glases containing TiO<sub>2</sub> yielded ⍺-Fe<sub>2</sub>O<sub>3</sub> when crystallized.