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Combustion synthesis; bismuth oxides; oxide–ion conductors.

Cubic fluorite related Bi_1–𝑥Ln_𝑥O_1.5 (Ln = Y and La–Yb) phases are synthesized by solutioncombustion method using glycine as the fuel. The cubic fluorite phase is stabilized with 25 mole% of rare earth cations. The lattice parameter of cubic phase increases linearly with size of the lanthanide ion. The synthesized powders are nano-metric in size and exhibit excellent compactability and reach 98% densification even on short period of sintering. The oxides with relatively larger cations Nd, Sm, Eu, Pr and Gd with 25 mole% composition transform to rhombohedral structure while others retain cubic upon sintering. All the phases show high oxide–ion conductivity and the values obtained are in good agreement with the reported values.

Manjunath B Bellakki¹ A S Prakash¹ C Shivakumara¹ M S Hegde¹ A K Shukla²

1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
2. Central Electrochemical Research Institute, Karaikudi 630 006, India

Published

August 2006

Manuscript received

24 May 2006