Abstract
A tetragonal 123 phase with the composition close to CeLa2 { Cu 2+2 } [Mg2+]O8 (the braces indicate the Cu(2) positions; the brackets indicate the Cu(1) positions) with the parameters a = b = 0.3909(3) nm, c = 1.6591(8) nm was prepared at 860°C under an oxygen atmosphere with an elevated oxygen pressure. When the lanthanum-for-barium substitution was incomplete, the resulting 123 phase had the composition close to CeLa1.7Ba0.3{ Cu 2+1.7 } [Mg]O8 with the unit cell parameters a = b = 0.3868(3) nm, c = 1.6578(8) nm that contains Cu3+ in the Cu(2) positions. The partial substitution of barium for lanthanum (the melting point of barium oxide is almost 500°C lower that of the lanthanum oxide) appreciably facilitated the synthesis: the 123 phase in this sample was more than 90%. The existence of Cu3+ in the Cu(2) positions enhanced the electrical conductivity of the sample.
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Stukan, R.A., Dudareva, T.V., Kil’yanov, Y.N. et al. 123 Phases in CeLa2Cu2MgO8 samples. Russ. J. Inorg. Chem. 51, 1–4 (2006). https://doi.org/10.1134/S0036023606010013
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DOI: https://doi.org/10.1134/S0036023606010013