Physical Vapor Transport Process in Closed Tubes

概要

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In some closed-tube systems, the growth rates (R) depend on the temperature of the growth site (T_c), but rarely on the temperature of the vapor source site (T_v). While this observation cannot be explained by a diffusion model, we give our interpretation in a heat transport theory. In general, R is proportional to both supersaturation σ and equilibrium vapor pressure P^0(T_c) at the growth site. Both experimental and theoretical results show that σ in the closed tubes is proportional to the temperature gradient, but not to the differenee of the vapor pressure: P^0(T_v)-P^0(T_c). This shows that σ is controlled by the flux of transported heat. However, as the variation of σ is smaller than that of P^0(T_c), the growth rate is highly dependent on T_c or P^0(T_c).
社団法人応用物理学会の論文
1993-02-15