The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the liquidus temperature of 45.2MgO54.8SiO 2 (mol%) system has been measured by the hot-thermocouple method. Moreover, The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the viscosity of 45.2MgO-54.8SiO 2 (mol%) melt has been measured with a rotating crucible viscometer. In addition, structural characterization of the quench vitreous samples was investigated by using IR spectra. Liquidus temperature and viscosity decreased with increasing of RE 2O 3 content, depending on the ionic radius of adding rare-earth elements. A marked change was observed in the order of ionic radius from La to Y. These results indicate that RE 2O 3 behaves as a network modifier in RE 2O 3- (45.2MgO-54.8SiO 2) melts. It is very likely that the RE 2O 3 with the larger ionic radius will modify the silicate networks more strongly. The IR spectra indicated that the degree of polymerization of silicate anions in RE 2O 3-(45.2MgO-54.8SiO 2) melts decreased with increasing RE 2O 3 content.
|ジャーナル||Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals|
|出版ステータス||出版済み - 1 1 2005|
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