Viscosity-structure relationship of alkaline earth silicate melts containing manganese oxide and calcium fluoride
- Authors
- Kim, Tae Sung; Park, Joo Hyun
- Issue Date
- Aug-2019
- Publisher
- American Ceramic Society
- Keywords
- alkaline earth silicates; CaF2; degree of polymerization; NBO; Si; Raman spectroscopy; viscosity
- Citation
- Journal of the American Ceramic Society, v.102, no.8, pp.4943 - 4955
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of the American Ceramic Society
- Volume
- 102
- Number
- 8
- Start Page
- 4943
- End Page
- 4955
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/2398
- DOI
- 10.1111/jace.16363
- ISSN
- 0002-7820
- Abstract
- The effect of CaF2 on the viscosities of the MO-SiO2-xMnO-yCaF(2) melts (M[=Ca or Ba]O/SiO2 = 0.4-0.5, x = 10[+/- 1] or 40[+/- 2] mol%, y = 0-15 mol%) have been studied at high temperatures. At MnO = 40[+/- 2] mol%, the viscosity of Ba-Mn-silicate melts is lower than that of Ca-Mn-silicate melts because Mn2+ is a strong network modifier in the former system. However, the viscosities of both alkaline earth silicate melts with MnO = 10[+/- 1] mol% are not affected by cation type because MnO activity is too low to affect the viscosity of the melts. The CaF2 addition decreases the viscosities of the Ba-Mn-silicate melts with low-MnO contents, while it has less impact on the viscosities of the melts with high-MnO contents. The effect of CaF2 on the relationship between viscosity and the structure of the silicate melts is quantitatively analyzed using the micro-Raman spectra of quenched glass samples. The NBO/Si ratio of alkaline earth silicate melts, which indicates the degree of polymerization of the silicate networks, has a linear relationship with the activation energy for the viscous flow of the melts.
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