Performance of neutron activation analysis in the evaluation of bismuth iodide purification methodology
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2017
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60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS
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Resumo
Bismuth tri-iodide (BiI3) is an attractive material for using as a semiconductor.
The behavior of semiconductor devices is strongly influenced by the presence of impurities
or contaminants remaining due to incomplete purification of the semiconductor
material. BiI3 has emerged as a particularly interesting material in view of its wide
band gap (1.7eV), large density (5.7g/cm3), high atomic number elements (Z=68)
and high resistivity (>109
cm). The BiI3 crystals have been grown by the vertical
Bridgman technique using commercially available powder. In this case, the BiI3 powder
was purified three times and, at each purification, the crystal was evaluated by
systematic measurements of reduction of impurities, crystalline structure, stoichiometry
and surface morphology. The purification efficiency was assessed by analyzing
the crystals, through Instrumental Neutron Activation Analysis (INAA). INAA is the
elemental analysis method usually chosen for these projects because of some features
such as: small amount of sample available, minimal sample handling and high sensitivity
for many elements. The analyzed crystals came from the impurity reduction
process occurred after each purification by the Repeated Vertical Bridgman method.
The results showed that INAA was a special analytical technique to identify and
quantify the impurities (Ag, As, Br, Cr, K, Mo, Na and Sb) in the BiI3 crystals and
to evaluate the reduction of the trace impurities, after each purification step.
Como referenciar
ARMELIN, M.J.A.; FERRAZ, C.M.; HAMADA, M. Performance of neutron activation analysis in the evaluation of bismuth iodide purification methodology. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 39-39. Disponível em: http://repositorio.ipen.br/handle/123456789/28736. 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.