Improvement of precursor on the Hg0.82Re0.18Ba2Ca2Cu3O8+d ceramic synthesised by the sealed quartz tube
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2006
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 17.
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Hg0.82Re0.18Ba2Ca2Cu3O8+d ceramic were prepared by solid-vapour reaction technique.
Firstly, the ceramic precursor were prepared with a mixture of Ba2Ca2Cu3Ox and ReO2 in
powder form with the molar relationship 1 : 0.18. The obtained precursor material was then
submitted to an annealing with three different partial pressure of oxygen (PO2): 5% of O2
and 95% of Ar (sample A), 10% of O2 and 90% of Ar (sample B) and 15% of O2 and 85%
of Ar (sample C). X-ray powder diffraction pattern analysis of each precursor preparation
step was done in order to evaluate the oxygen content of the ceramic precursor. The
identified phases were BaCuO2+x, Ba2Cu3O5+x, Ba4CaCu3O8+x, Ca2CuO3 and
Ca5Re2O12. The BaCuO2+x phase was found 64%, 33% and 50% from the XRD spectra
for sample A, B and C, respectively. The Ba2Cu3O5+x phase was found 10%, 34% and
14% for sample A, B and C, respectively. Furthermore, the peaks associated with the
BaCuO2+x, Ba2Cu3O5+x phases, which has oxygen stoichiometry variation, are slightly
displaced to low angles. This is an indication that there was a oxygen increment of the
precursors ceramics B and C, as compared with ceramic A. The precursors prepared with
different PO2 were blended with HgO at molar relationship 1 : 0.82. The Refinement of
XRD measurements indicated that the phase, Hg,Re-1223, Hg-1223, HgCaO2, BaCO3,
CaCuO2 and BaCuO2+x were also found. The phase Hg,Re-1223 was very crystalline as
shown by the small broadening of their peaks. The XRD spectra of all samples were quite
similar and the cell parameters did not show important differences. These samples were
also investigated by ac electrical resistivity measurements. Our results showed similar Tc
(133.6, 133.9 and 133.7 K for sample A, B and C, respectively).
Como referenciar
PASSOS, C.A.C.; PASSAMAI JUNIOR, J.L.; CRUZ, P.C.M. da; ORLANDO, M.T.D.; MARTINEZ, L.G. Improvement of precursor on the Hg0.82Re0.18Ba2Ca2Cu3O8+d ceramic synthesised by the sealed quartz tube. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 17., 15-19 de novembro, 2006, Foz do Iguaçu, PR. Resumos... p. 859. Disponível em: http://repositorio.ipen.br/handle/123456789/20061. 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.