Abstract
AbstractThe homeotypic compounds La16.32Ba1.82Sr7.86[Si60N92.32O3.68]O12 and La13.68Sr12.32[Si60N96]F6.32O5.68 were synthesized at high temperature (1600/1500 °C) in a radio‐frequency furnace. The crystal structures [I$\bar{4}$m (no. 217), Z = 1, a = 13.3360(10)/13.3258(10) Å and V = 2371.8(5)/2366.4(5) Å3] were solved and refined on basis of single‐crystal X‐ray diffraction data and were corroborated by lattice‐energy calculations (Madelung part of lattice energy, MAPLE) powder X‐ray diffraction data and FTIR spectroscopy. They consist of a three‐dimensional network of allside corner sharing SiN4–xOx tetrahedra. The framework is characterized by double dreier rings. La16.32Ba1.82Sr7.86[Si60N92.32O3.68]O12 represents an oxonitridosilicate oxide and La13.68Sr12.32[Si60N96]F6.32O5.68 a nitridosilicate fluoride oxide, as the crystal structures contain non‐condensed (O[0]/O,F[0]) anions. The first compound is isotypic to Sr3Ln10Si18Al12O18N36 (Ln = Ce, Pr, Nd; Z = 2), whereas the latter describes a disordered model of the crystal structure, which is homeotypic to the mentioned SiAlONs.
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