Effect of La2O3 on the structure of lead borate glasses

被引：83
作者：
Doweidar, H. [1 ]
Saddeek, Yasser B. [2 ]
机构：
[1] Mansoura Univ, Fac Sci, Dept Phys, Glass Res Grp, Mansoura 35516, Egypt
[2] Al Azhar Univ, Fac Sci, Dept Phys, Assiut 71524, Egypt
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2010年 / 356卷 / 28-30期
关键词：
Lanthanum borate glasses; IR; Density; Elastic properties; LANTHANUM ALUMINOSILICATE GLASSES; NUCLEAR MAGNETIC-RESONANCE; INFRARED-SPECTROSCOPY; PHYSICAL-PROPERTIES; OPTICAL-PROPERTIES; ELASTIC PROPERTIES; NETWORK STRUCTURE; RAMAN; CRYSTALLIZATION; PBO-B2O3;
D O I：
10.1016/j.jnoncrysol.2010.04.036
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
xLa(2)O(3)-30PbO-(70 - x)B2O3 (0 <= x <= 10 mol%) glasses have been investigated by Fourier transform infrared spectroscopy, and ultrasonics. Deconvolution of infrared spectra reveals a small increase with x in the fraction of four-coordinated boron atoms. These results show that La3+ ions have priority to form BO4 units at the expense of Pb2+ ions. A minimum in the sound velocity, elastic properties and transition temperature of glasses observed at 5 mol% La2O3 is correlated with the change in the packing of glass. Higher rate of increase in density for x >= 5 mol% is considered due to an increase in the concentration of PbO4 units. (C) 2010 Elsevier B.V. All rights reserved.
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收藏
页码：1452 / 1457
页数：6
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