Abstract
Pure Ca 1− x Eu x Ta(O,N) 3 were successfully synthesized in the whole range of Ca/Eu compositions by means of ammonia nitridation via a citrate precursor route. As-nitrided products with x < 0.4 were apparently orthorhombic, while those with x ≥ 0.4 crystallized in a cubic structure. The anionic composition was found to be essentially O 2N and independent of Eu content ( x). The as-nitrided EuTaO 2N possessed a cubic perovskite-type structure, while high-temperature post-annealing led to a tetragonal EuTaO 2N phase with better crystallinity. The re-nitridation transformed the post-annealed product into the original cubic lattice, which might be an average of the tetragonal micro-domains.
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