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Magnesium doping on brownmillerite Ca2FeAlO5
Malveiro, J.; Ramos, T.; Ferreira, L. P.; Waerenborgh, J. C.; Nunes, M. R.; Godinho, M.; Carvalho, M. D.Ca2FeAl1-xMgxO5 (x=0, 0.05 and 0.1) compounds adopting the brownmillerite-type structure were prepared by a self-combustion route using two different fuels. Characterisation was performed using X-ray powder diffraction, Mössbauer spectroscopy, magnetisation measurements, chemical analysis, scanning electron microscopy and 4-point dc conductivity measurements. Global results indicate that the solubility limit wa...
Structural and magnetic properties of UFe6Ga6
Gonçalves, A. P.; Waerenborgh, J. C.; Sério, S.; Paixão, J. A.; Godinho, M.; Almeida, M.UFe6Ga6 polycrystalline samples were prepared by arc-melting, and single crystals were grown by the Czochralski method. This compound crystallizes in the orthorhombic ScFe6Ga6-type structure (space group Immm, a=5.0560(4), b=8.5484(7) and c=8.6914(7) A), an ordered variant of the ThMn12-type structure. A ferromagnetic-type transition at TC=530(5) K is seen in the magnetization and A.C.-susceptibility measuremen...
Crystallographic and magnetic properties of UFe5.8Al6.2 single crystals
Gonçalves, A. P.; Estrela, P.; Waerenborgh, J. C.; Paixão, J. A.; Bonnet, M.; Spirlet, J. C.; Godinho, M.; Almeida, M.Single crystals of UFe5.8Al6.2 were characterised by X-ray and neutron diffraction, 57Fe Mössbauer spectroscopy and magnetisation. The structure refinement by X-ray and neutron diffraction shows a ThMn12-type structure, the Fe atoms fully occupying the 8f and partially occupying the 8j positions. Mössbauer spectra confirm these occupations and further indicate a magnetic ordering below 293 K. Magnetisation meas...
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