O-18 DIFFUSION THROUGH AMORPHOUS SIO2 AND CRISTOBALITE

被引:63
|
作者
RODRIGUEZVIEJO, J
SIBIEUDE, F
CLAVAGUERAMORA, MT
MONTY, C
机构
[1] UNIV AUTONOMA BARCELONA,DEPT FIS,E-08193 BARCELONA,SPAIN
[2] LAB PHYS MAT,CNRS,F-92195 MEUDON,FRANCE
关键词
D O I
10.1063/1.110644
中图分类号
O59 [应用物理学];
学科分类号
摘要
Secondary ion mass spectrometry was used to profile the diffusion of oxygen in polycrystalline beta-cristobalite and vitreous SiO2. The tracer concentration profiles of cristobalite are consistent with a model based on two mechanisms: bulk and short-circuit diffusion. The profiles of partially crystallized samples containing vitreous SiO2 and beta-cristobalite were fitted using the sum of two complementary error functions and taking account of some interstitial-network exchange. The bulk oxygen diffusivity, in the temperature range 1240-1500-degrees-C, is about five times greater for vitreous silica than for beta-cristobalite.
引用
收藏
页码:1906 / 1908
页数:3
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