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Effect of Y2O3 and Er2O3 co-dopants on phase stabilization of bismuth oxide

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Title: Effect of Y2O3 and Er2O3 co-dopants on phase stabilization of bismuth oxide
Authors: Arasteh, Sepideh1, Maghsoudipour, Amir2 a_maghsoudipour@yahoo.com, Alizadeh, Masoud2, Nemati, Ali3
Source: Ceramics International. Dec2011, Vol. 37 Issue 8, p3451-3455. 5p.
Subjects: Phase transitions, Bismuth trioxide, Rare earth oxides, Solid state chemistry, Chemical reactions, Solid solutions, Powder metallurgy, Solid oxide fuel cells
Abstract: Abstract: Bi2O3 compositions were prepared to investigate the effect of rare earth metal oxides as co-dopants on phase stability of bismuth oxide. Compositions containing 9–14mol% of Y2O3 and Er2O3 were synthesized by solid state reaction. The structural characterization was carried out using X-ray powder diffraction. The XRD results show that the samples containing 12 and 14mol% total dopants had cubic structure, whereas the samples with lower dopant concentrations were tetragonal. Comparing the lattice parameters of the cubic phases of (Bi2O3)0.88(Y2O3)0.06(Er2O3)0.06 and (Bi2O3)0.86(Y2O3)0.07(Er2O3)0.07 revealed that lattice parameter decreases by increasing the dopant concentration. The XRD pattern and the powder density results indicated the formation of solid solution in the studied systems. After annealing samples with cubic phase at 600°C for various periods of time, phase transformation to tetragonal and rhombohedral occurs. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: Bi2O3 compositions were prepared to investigate the effect of rare earth metal oxides as co-dopants on phase stability of bismuth oxide. Compositions containing 9–14mol% of Y2O3 and Er2O3 were synthesized by solid state reaction. The structural characterization was carried out using X-ray powder diffraction. The XRD results show that the samples containing 12 and 14mol% total dopants had cubic structure, whereas the samples with lower dopant concentrations were tetragonal. Comparing the lattice parameters of the cubic phases of (Bi2O3)0.88(Y2O3)0.06(Er2O3)0.06 and (Bi2O3)0.86(Y2O3)0.07(Er2O3)0.07 revealed that lattice parameter decreases by increasing the dopant concentration. The XRD pattern and the powder density results indicated the formation of solid solution in the studied systems. After annealing samples with cubic phase at 600°C for various periods of time, phase transformation to tetragonal and rhombohedral occurs. [Copyright &y& Elsevier]
ISSN:02728842
DOI:10.1016/j.ceramint.2011.04.136