Lanthanum
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Data
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2024
Autores IPEN
CARLOS ALBERTO DA SILVA QUEIROZ
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BRAZIL MRS MEETING, 22nd
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Resumo
The following studies are presented: Preparation of lanthanum oxide for use as spec pure
standard and synthesis and characterization of lanthanum peroxide. Using the fraction
precipitation and cationic ion exchange techniques, with EDTA as eluent, it was possible to
obtain pure lanthanum oxide ≥ 99.9%, whose Impurities were in the same level as in the
imported standard. The yield for the combined techniques was reasonable high (≥ 80%).
The raw material in the form of mixed rare earth carbonate (La2O3 45%) comes from by
commercial rare earth concentrate. Emphasis was given to the analytical control to assure
the purity of La2O2≥99.9% by spectrophotometry and mass spectrometry. A study was
made for the optimization of dissolution lanthanum carbonate, from the lanthanum spec
pure standard obtained here, as function of the concentration of ammonium carbonate and
ammonium carbonate\ammonium hydroxide searching the maximum solubilization of the
lanthanum carbonate. The lanthanum peroxide was prepared by the addition of hydrogen
peroxide to the complexed soluble lanthanum carbonate. These studies included also the
determination of active oxygen, the total lanthanum oxide by gravimetry and complexometry
and the C, H, O contents by microanalysis. The peroxide was also investigated by infrared
spectroscopy and thermal analysis. The analytical data collected allowed to conclude that
the stoichiometric formula for the peroxide is La2O2(CO3)2 1.25H2O.
Como referenciar
QUEIROZ, CARLOS A. da S. Lanthanum: preparation of spec pure standard and synthesis of peroxide. In: BRAZIL MRS MEETING, 22nd, September 29 - October 3, 2024, Santos, SP. Abstract... São Carlos, SP: Aptor Software, 2024. p. 349-349. Disponível em: https://repositorio.ipen.br/handle/123456789/48951. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.