Abstract
Examination of ferrite reactor product has resulted in the detection of a previously unreported Me4O5 oxide structure type with substituted composition Ca0.11Na1.11(Fe2.84Mg0.04)Si0.01O5. Investigation of the system Ca2xNa1-xFe3-xO5, x = 0.05 to 0.3 has shown that the simplified composition of this phase is Ca0.2Na0.9Fe2.9O5 (Z = 4). Using the orthorhombic unit cell dimensions determined by indexing powder X-ray data, a = 10.28, 10.29(1), b = 12.52, 12.46(1), c = 3.01, 3.01(1) Å (for Ca0.11Na1.11 (Fe2.84Mg0.04)Si0.01O5 and Ca0.2Na0.9Fe2.9O5 respectively), and the most probable space group Pnnm, the crystal structure of this phase has been determined and refined from the powder data. Ca0.2Na0.9Fe2.9O5 may be described as having layers composed of Fe octahedra and tetrahedra on either side of (010) planes of Na trigonal prisms. The overall relationship to CaFe2O4, CaFe3O5, and the lillianite homologous series is discussed. The Ca0.2Na0.9Fe2.9O5 structure type is apparently stabilized by incorporation of the minor Ca into the NaFe3O5 composition.
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