Growth dynamics of vaterite in relation to the physico-chemical properties of its precursor, amorphous calcium carbonate, in the Ca-CO3-PO4 system

Yuki Sugiura, Kazuo Onuma, Atsushi Yamazaki

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Vaterite is one of three non-hydrate calcium carbonate crystalline polymorphs and is formed as an initial phase under pseudo-biological conditions. However, biological hard tissues that use vaterite are rare; the reason for vaterite rarely appearing in vivo is still unclear. There is consensus that, in phosphate-containing solutions, vaterite barely forms and amorphous calcium carbonate (ACC), the precursor of crystalline calcium carbonate and considered as aggregation of growth unit of vaterite, is stabilized. In this study, to clarify the biomineralization process, we investigated how phosphate acts as an inhibitor of vaterite growth. We measured vaterite growth rates in situ and estimated the essential crystal growth parameter, edge free energy, in the Ca-CO3-PO4 system in relation to the physico-chemical properties of ACC. The effects of PO4 on the ACC structure and dynamics were also observed. Co-existed PO4 reduced the growth rate of vaterite even when it was added in μM-scale concentrations. The surface free energy of vaterite increased with increasing PO4 concentration and was 10× higher in a 10 μM PO4-containing solution than in a PO4-free solution. Spectroscopic analyses showed that the chemical bonds in ACC particles were drastically changed by the addition of μM-scale PO4, and the particles could no longer transform into vaterite. We conclude that PO4 inhibits vaterite growth and changed the ACC structure. And the original growth units of vaterite were also modified to the other structures. Thus, vaterite crystals could not grow by association of these growth units, which resulted in an increase in the apparent surface free energy of vaterite.

    Original languageEnglish
    Pages (from-to)289-296
    Number of pages8
    JournalAmerican Mineralogist
    Volume101
    Issue number2
    DOIs
    Publication statusPublished - 2016 Jan 1

    Fingerprint

    vaterite
    Calcium Carbonate
    calcium carbonates
    calcium carbonate
    chemical properties
    Chemical properties
    chemical property
    free energy
    phosphates
    chemical bonds
    inhibitors
    Free energy
    crystal growth
    phosphate
    crystal
    Crystallization
    energy
    biomineralization

    Keywords

    • biomineralization
    • crystal growth
    • intermediate phase
    • Vaterite

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geophysics

    Cite this

    Growth dynamics of vaterite in relation to the physico-chemical properties of its precursor, amorphous calcium carbonate, in the Ca-CO3-PO4 system. / Sugiura, Yuki; Onuma, Kazuo; Yamazaki, Atsushi.

    In: American Mineralogist, Vol. 101, No. 2, 01.01.2016, p. 289-296.

    Research output: Contribution to journalArticle

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