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Large scale melt synthesis in an open crucible of Na-fluorohectorite with superb charge homogeneity and particle size

Title data

Kalo, Hussein ; Möller, Michael W. ; Ziadeh, Mazen ; Dolejš, David ; Breu, Josef:
Large scale melt synthesis in an open crucible of Na-fluorohectorite with superb charge homogeneity and particle size.
In: Applied Clay Science. Vol. 48 (2010) Issue 1-2 . - pp. 39-45.
ISSN 0169-1317
DOI: https://doi.org/10.1016/j.clay.2009.11.014

Abstract in another language

Sodium fluorohectorite Na0.6[Mg2.4Li0.6]Si4O10F2 was synthesized from the melt in an open glassy carbon crucible at 1265 °C under argon flow. A glass (Na2O–Li2O–SiO2) precursor was used as a fluxing agent in order to maintain a low vapor pressure of volatile fluorides and sustain a low silica activity, which inhibits the formation of silicon fluoride gases and promotes the fluorine solubility in the melt. To minimize the loss of volatile fluorine compounds the pre-synthesized alkali silicate glass was heated together with additional raw materials needed in a high frequency induction furnace rapidly from 800 °C up to 1265 °C and then kept at this temperature for a short period of time (15 min). The synthesis method can easily be scaled to batches larger than 1 kg. The Na0.6-fluorohectorite obtained stands out by (i) phase purity as checked by X-ray powder diffraction (PXRD), (ii) a superb homogeneity of the charge density as demonstrated by stepwise hydration behavior followed by in-situ PXRD in a humidity chamber and the Lagaly method with alkylammonium exchange (Mermut and Lagaly, 2001), (iii) a high cation exchange capacity (CEC) of 136 meq/100 g as determined by the copper complex ([Cu(trien)]2+) method, and (iv) extreme lateral extensions with a median value of the particle size of 45 μm as measured by static laser light scattering (SLS) which was confirmed by scanning electron microscopy (SEM).

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Fluorohectorite; Melt synthesis; Large scale synthesis; Charge homogeneity
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP A 6
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 23 Mar 2018 07:52
Last Modified: 23 Mar 2018 07:52
URI: https://eref.uni-bayreuth.de/id/eprint/9950