Navegando por Autor "Cunha, J. B. M. da"

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Atomic hopping in AlCuFe quasicrystal
(Elsevier, 1996-03) Araujo, Jose Humberto; Gomes, A. A.; Cunha, J. B. M. da
High temperature 57Fe MOsshaner effect measurements in annealed icosahedral A1CuFe alloy are reported. The anomalous decrease in Debye-Waller factor is qualitatively interpretated. It is suggested using consistent parameters that the isomer shift decreases linearly with temperature in agreement with a second-order Doppler shift in the Debye approximation.
Mössbauer effect characterization of Brazilian iron ores for mining industrial purposes
(Elsevier, 1993-04-04) Araujo, Jose Humberto; Costa Jr., M. I. da; Kunrath, J. I.; Cunha, J. B. M. da; Moro, J. T.
Iron ore is one of the important export products of Brazil. As only ore bodies with over 50% iron contents are mined, continuous efforts in prospecting are made. The use of Mössbauer spectroscopy as an aid to these efforts is illustrated by an example given in this report.

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