Počet záznamů: 1  

3D microstructure of magnesium potassium phosphate ceramics from X-ray tomography: new insights into the reaction mechanisms

  1. 1.
    SYSNO ASEP0496962
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    Název3D microstructure of magnesium potassium phosphate ceramics from X-ray tomography: new insights into the reaction mechanisms
    Tvůrce(i) Viani, Alberto (UTAM-F) RID, ORCID, SAI
    Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAI
    Lanzafame, G. (IT)
    Mancini, L. (IT)
    Celkový počet autorů4
    Zdroj.dok.Journal of Materials Science. - : Springer - ISSN 0022-2461
    Roč. 54, č. 5 (2019), s. 3748-3760
    Poč.str.13 s.
    Forma vydáníTištěná - P
    Jazyk dok.eng - angličtina
    Země vyd.US - Spojené státy americké
    Klíč. slovamagnesium potassium phosphate ceramics ; 3D microstructure ; synchrotron X-ray computed microtomography
    Vědní obor RIVJN - Stavebnictví
    Obor OECDMaterials engineering
    CEPLO1219 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy
    Způsob publikováníOpen access
    UT WOS000452712800005
    EID SCOPUS85056575816
    DOI10.1007/s10853-018-3113-7
    AnotaceMagnesium potassium phosphate ceramics are chemically bonded ceramics employed as biomaterials, in nuclear waste encapsulation and for concrete repair. The microstructure dictates material performance and depends on the raw mix composition. Synchrotron X-ray computed microtomography was employed to describe the 3D microstructure and its time evolution during hardening and gain insights into the reaction mechanisms. Any excess water with respect to the stoichiometry of the reaction brought about an increase in porosity, but, notably, a reduction in the average pore size. Crystals filled the water ‘pockets’ in the ceramic volume by growing larger, although less densely packed, increasing the complexity of the pore shape. Platelet over elongated crystal habit was favoured. Such a change in shape is likely related to a change in reaction mechanism, as crystallization from a gel-like amorphous precursor is hindered and progressively substituted by a through-solution mechanism. It is proposed that the time evolution of the microstructure is dictated by the balance between crystallization from amorphous precursor, prevailing in relatively ‘dense’ systems (with stoichiometric water or in low excess), and water segregation, prevailing at higher water contents. The former mechanism was shown to produce an increase in porosity with time, because of the density mismatch between the amorphous and the crystalline phase
    PracovištěÚstav teoretické a aplikované mechaniky
    KontaktKulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285
    Rok sběru2020
    Elektronická adresahttps://doi.org/10.1007/s10853-018-3113-7
Počet záznamů: 1  

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