Effect of RE 2O 3 (RE = Y, Gd, Nd and La) additions on liquidas temperatures and viscosities of MgrO-SiO 2 melts
Effect of RE 2O 3 (RE = Y, Gd, Nd and La) additions on liquidas temperatures and viscosities of MgrO-SiO 2 melts
复制标题
RE 2O 3 (RE = Y、Gd、Nd 和 La) 添加量对 MgO-SiO 2 熔体液相温度和粘度的影响
DOI：
10.2320/jinstmet.69.152
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发表时间：
2005
影响因子：
--
通讯作者：
K. Nakashima
中科院分区：
文献类型：
--
作者：
N. Saito;Daiji Nakata;A. Umemoto;K. Nakashima
采用热电偶法测定了添加RE2O3 （RE=Y, Gd， Nd和La）对45.2MgO-54.8SiO2 （mol%）体系液相温度的影响。用旋转坩埚粘度计测定了添加RE2O3 （RE=Y, Gd， Nd和La）对45.2MgO-54.8SiO2 （mol%）熔体粘度的影响。此外，利用红外光谱对淬火玻璃样品进行了结构表征。液相温度和粘度随RE2O3含量的增加而降低，这取决于稀土元素加入的离子半径。结果表明，RE2O3在RE2O3- (45.2MgO-54.8SiO2)熔体中具有网络改性剂的作用。具有较大离子半径的RE2O3很可能会对硅酸盐网络进行更强的修饰。红外光谱分析表明，RE2O3-(45.2MgO-54.8SiO2)熔体中硅酸盐阴离子的聚合度随着RE2O3含量的增加而降低。
The effect of adding RE2O3 (RE=Y, Gd, Nd and La) on the liquidus temperature of 45.2MgO-54.8SiO2 (mol%) system has been measured by the hot-thermocouple method. Moreover, The effect of adding RE2O3 (RE=Y, Gd, Nd and La) on the viscosity of 45.2MgO-54.8SiO2 (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 RE2O3 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 RE2O3 behaves as a network modifier in RE2O3- (45.2MgO-54.8SiO2) melts. It is very likely that the RE2O3 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 RE2O3-(45.2MgO-54.8SiO2) melts decreased with increasing RE2O3 content.