Modification of crystal growth mechanism of yttrium oxalate in metastable solution

Min Hyun Sung, Joon Soo Kim, Woon Soo Kim, Izumi Hirasawa, Woo Sik Kim

    研究成果: Article

    12 引用 (Scopus)

    抄録

    In the seeded crystallization of yttrium oxalate from a metastable supersaturated solution, the growth mechanism was observed to become modified by variations in agitation and additive concentration. From the desupersaturation curve, the crystal growth rate was estimated and described using a power law of supersaturation (RT = KgΔCp). Without an additive in the metastable solution, the overall growth rate coefficient, Kg, increased with an increase in the agitation speed while the growth rate order, p, was almost independent of the agitation speed. When the additive sodium tripolyphosphate was used to inhibit crystal growth, the desupersaturation in the solution was substantially retarded and the growth rate order varied up to about 2.5 with an increase in the additive concentration. Using a two-step growth model, the kinetic parameter dependencies of the crystal growth of yttrium oxalate, such as the mass transfer coefficient, surface integration order, and surface integration coefficient, were estimated in relation to the agitation speed and additive concentration. The mass transfer coefficient increased with an increase in the agitation, whereas the surface integration coefficient was independent of the agitation speed. However, as the additive concentration in the solution increased, the surface integration coefficient was reduced while the mass transfer coefficient remained almost invariant. The change in the rate-determining step by the additive was examined using an effectiveness factor. It was shown that the effect of the additive on the surface integration followed a Langmuir type isotherm.

    元の言語English
    ページ(範囲)529-540
    ページ数12
    ジャーナルJournal of Crystal Growth
    235
    発行部数1-4
    DOI
    出版物ステータスPublished - 2002 2

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    Yttrium
    Oxalates
    oxalates
    Crystallization
    yttrium
    Crystal growth
    agitation
    crystal growth
    Mass transfer
    coefficients
    mass transfer
    Supersaturation
    Kinetic parameters
    Isotherms
    Sodium
    supersaturation
    isotherms
    sodium
    crystallization
    kinetics

    ASJC Scopus subject areas

    • Condensed Matter Physics

    これを引用

    Modification of crystal growth mechanism of yttrium oxalate in metastable solution. / Sung, Min Hyun; Kim, Joon Soo; Kim, Woon Soo; Hirasawa, Izumi; Kim, Woo Sik.

    :: Journal of Crystal Growth, 巻 235, 番号 1-4, 02.2002, p. 529-540.

    研究成果: Article

    Sung, Min Hyun ; Kim, Joon Soo ; Kim, Woon Soo ; Hirasawa, Izumi ; Kim, Woo Sik. / Modification of crystal growth mechanism of yttrium oxalate in metastable solution. :: Journal of Crystal Growth. 2002 ; 巻 235, 番号 1-4. pp. 529-540.
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    abstract = "In the seeded crystallization of yttrium oxalate from a metastable supersaturated solution, the growth mechanism was observed to become modified by variations in agitation and additive concentration. From the desupersaturation curve, the crystal growth rate was estimated and described using a power law of supersaturation (RT = KgΔCp). Without an additive in the metastable solution, the overall growth rate coefficient, Kg, increased with an increase in the agitation speed while the growth rate order, p, was almost independent of the agitation speed. When the additive sodium tripolyphosphate was used to inhibit crystal growth, the desupersaturation in the solution was substantially retarded and the growth rate order varied up to about 2.5 with an increase in the additive concentration. Using a two-step growth model, the kinetic parameter dependencies of the crystal growth of yttrium oxalate, such as the mass transfer coefficient, surface integration order, and surface integration coefficient, were estimated in relation to the agitation speed and additive concentration. The mass transfer coefficient increased with an increase in the agitation, whereas the surface integration coefficient was independent of the agitation speed. However, as the additive concentration in the solution increased, the surface integration coefficient was reduced while the mass transfer coefficient remained almost invariant. The change in the rate-determining step by the additive was examined using an effectiveness factor. It was shown that the effect of the additive on the surface integration followed a Langmuir type isotherm.",
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