Glass formation from iron-rich phosphate melts

Autor(es)

Zhang, L. ^[1] ; Brow, R. K. ^[1] ; Schlesinger, M. E. ^[1] ; Ghussn, L. ^[2] ; Zanotto, E. D. ^[2]

Afiliação do(s) autor(es)

^[1] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65409 - USA

^[2] Univ Fed Sao Carlos, Vitreous Mat Lab, LaMaV, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Non-Crystalline Solids; v. 356, n. 25-27, p. 1252-1257, JUN 1 2010.
• Citações Web of Science: 35

Resumo

Iron-rich phosphate glasses with nominal Fe/P ratios between 1.0 and 1.6 were prepared by a roller-quenching technique. The critical cooling rates (CCR) for glass formation were estimated by differential thermal analysis and found to be in the range of 10(3)-10(4) degrees C/5 for the iron-rich melts, compared to 1-10 degrees C/s for conventional iron phosphate melts with nominal Fe/P ratios near 0.50. The Fe(II)/Fe(total) fraction in the quenched glasses increases with melt time and temperature, and ranges between 0.30 and 0.55 for the glasses studied. Raman spectroscopy indicates that the structures of the iron-rich phosphate glasses are based on isolated orthophosphate tetrahedra, similar to what are found in alpha-FePO(4). (C) 2010 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/08179-9 - Processos cinéticos em vidros e vitrocerâmicas
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Temático