Fast Diffusion Process in Quenched hcp Dilute Solid ³He鈥?sup>4He Mixture

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• 作者：Y. O. Vekhov ; A. P. Birchenko ; N. P. Mikhin and E. Y. Rudavskii
• 关键词：NMR ; 3He– ; 4He solid mixture ; Diffusion ; Defects
• 刊名：Journal of Low Temperature Physics
• 出版时间：February, 2010
• 出版年：2010
• 期刊代码：20_00222291
• 类别：law
• 卷：158
• 期：3-4
• 页码：496-501
• 数据来源：sp

摘要

The study of phase structure of dilute 3He–4He solid mixtures of differing quality is performed by the spin echo NMR technique. The diffusion coefficient is determined for each coexistent phase. Two diffusion processes are observed in rapidly quenched (non-equilibrium) hcp samples: the first process has a diffusion coefficient corresponding to hcp phase and the second one has huge diffusion coefficient corresponding to liquid phase, which is evidence of liquid-like inclusions formation during fast crystal growing. It is established that these inclusions disappear in equilibrium crystals after careful annealing.