Correlation of light scattering and molecular dynamics in superionic Ba1-xLaxF2+x

被引:1
|
作者
Rammutla, KE
Comins, JD [1 ]
Netshisaulu, TT
Ngoepe, PE
Chadwick, AV
机构
[1] Univ Witwatersrand, Dept Phys, ZA-2050 Wits, South Africa
[2] Univ North, Mat Modelling Ctr, ZA-0727 Sovenga, South Africa
[3] Univ Kent, Dept Chem, Canterbury CT2 7NH, Kent, England
来源
RADIATION EFFECTS AND DEFECTS IN SOLIDS | 2001年 / 155卷 / 1-4期
基金
新加坡国家研究基金会;
关键词
Ba1-xLaxF2+x; Brillouin shifts; Raman linewidths; diffusion coefficients;
D O I
10.1080/10420150108214145
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
The squares of the Brillouin frequencies (Deltaomega(B))(2) of the LA mode in the [100] direction related to the Cl, elastic constant show a linear decrease with temperature followed by significant deviations that occur above the corresponding transition temperatures (T-c), being at 850, 800, 970, 950 and 920 K for samples with x = 0.05, 0.1, 0.2, 0.3 and 0.5, respectively. The Raman linewidths show linear increases with temperature followed by rapid increases around the same temperatures at which the elastic constants start to show marked decreases. The complementary studies using Molecular Dynamics show that the diffusion coefficients start to increase markedly around the same temperatures observed experimentally.
引用
收藏
页码:403 / 407
页数:5
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