ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 30, (2) 97 - 102 (1986)


COORDINATION OF AlIII ATOMS IN MELTS OF THE SYSTEM CaO-Al2O3-SiO2
 
Daněk Vladimír
 
Institute of Inorganic Chemistry, Centre of Chemical Research Slovak Academy of Sciences, 842 36 Bratislava

Calculation was carried out of a part of the phase diagram of the system CaO-Al2O3-SiO2 in the region of primary crystallization of wollastonite, anorthite, gehlenite and dicalcium silicate (xCaO/xAl2O3 ≥ 1). A satisfactory agreement with the experimentally determined phase diagram was obtained on the assumption that only one half of the AlIII atoms present is tetrahedrally coordinated and the remaining half shows a higher coordination, behaves as a modifier of the tetrahedral network, and thus does not contribute to the cross-linking of the polyanions. The behaviour of AlIII atoms in silicate melts is similar to that of FeIII atoms.


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