Unsteady growth of ammonium chloride dendrites

Publication date: 15 February 2016
Source:Journal of Crystal Growth, Volume 436
Author(s): L.M. Martyushev, P.S. Terentiev, A.S. Soboleva
Growth of ammonium chloride dendrites from aqueous solution is experimentally investigated. The growth rate υ and the radius ρ of curvature of branches are measured as a function of the relative supersaturation Δ for steady and unsteady growth conditions. It is shown that the experimental results are quantitatively described by the dependences ρ=a/Δ+b, υ=сΔ², where the factors for primary branches are a=(1.3±0.2)·10⁻⁷m, b=(2.5±0.4)·10⁻⁷m, and c=(2.2±0.3)·10⁻⁴m/s. The factor c is found to be approximately 7 times smaller for the side branches than that for the primary branches.



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