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Study of the magnetic disaccommodation in La doped YIG
Torres, C.; Hernández-Gómez, P.; Francisco, C. de; Arias, A. González; Muñoz, J. M.; Alejos, O.; Perdigão, J. M.; Ferreira, A. R.The relaxation of the initial magnetic permeability of La doped yttrium iron garnet (YIG) samples with nominal composition Y3-xLaxFe5O12 (0< x <0.6) is analysed in this work. The results show a very different behaviour depending on the sintering atmosphere used for the fabrication of the samples. Concretely, for the samples sintered in air, it just have been detected the usual relaxation peak found in YIG at 13...
Investigation of the garnet-perovskite transition in Nd doped YIG by means of m...
Hernández-Gómez, P.; Francisco, C. de; Torres, C.; Iñiguez, J.; Raposo, V.; Perdigão, J. M.; Ferreira, A. R.The garnet-perovskite transition is studied in this work with magnetic disaccommodation on polycrystalline Nd doped YIG samples Y3-xNdxFe5O12 (0 < x < 2.5). A very different behaviour with the sintering atmosphere is observed. The results of magnetic disaccommodation for samples sintered in air reveal that the low temperature peak of YIG at 120 K disappear and another peak emerge at 300 K with x = 2.0, when the...
A pulsed method for measuring the conductivity on solid ionic conductors
Certo, J.; Perdigão, J. M.; Furtado, C. S.; Ferreira, A. J.Electrode polarization is the main drawback when measuring the conductivity on solid ionic conductors. To overcome this inconvenience, a two-terminal pulsed method was used to measure, under strong electrode polarization, the dc conductivity on Na-[beta]-alumina samples. The results agree well with those obtained with impedance spectroscopy. ; http://www.sciencedirect.com/science/article/B6TX0-3WTWPKW-1C/1/f...
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