EL HAFID, Hassan; VELÁZQUEZ, Matias; EL JAZOULI, Abdelaziz; WATTIAUX, Alain; CARLIER-LARREGARAY, Dany; DECOURT, Rodolphe; COUZI, Michel; GODNER, Philippe; DELMAS, Claude

doi:10.1016/j.solidstatesciences.2014.07.011

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EL HAFID, Hassan
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

VELÁZQUEZ, Matias
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

EL JAZOULI, Abdelaziz
Laboratoire de Chimie des Matériaux Solides

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Solid State Sciences. 2014, vol. 36, p. 52-61

Elsevier

Résumé en anglais

AFe3O(PO4)3 (A = Ca, Sr and Pb) powder compounds were studied by means of X-ray diffraction (XRD), electron-probe microanalysis (EPMA) coupled with wavelength dispersion spectroscopy (WDS), Raman and diffuse reflectance spectroscopies, specific heat and magnetic properties measurements. Magnetization, magnetic susceptibility and specific heat measurements carried out on AFe3O(PO4)3 (A = Sr, Ca and Pb) powders firmly establish a series of three ferromagnetic (FM)-like second order phase transitions spanned over the 32-8 K temperature range. Room temperature Mössbauer spectroscopy and associated DFT calculations confirm the existence of three crystallographically non equivalent Fe3+ sites in the three compounds. Mössbauer spectra recorded as a function of temperature in the PbFe3O(PO4)3 compound also establishes the occurrence of two purely magnetic and reversible phase transitions at 32 and 10 K. Diffuse reflectance measurements reveal two broad absorption bands at 1047 and 837 nm, in both PbFe3O(PO4)3 and SrFe3O(PO4)3 powders, with peak cross sections ∼10−20 cm2 typical of spin-forbidden and forced electric dipole intraconfigurational transitions.< Réduire

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X-ray diffraction

Transition metal phosphates

Phase transitions

Ferrimagnetism

Mössbauer spectroscopy

Specific heat

Raman spectroscopy

Magnetic susceptibility

Diffuse reflectance

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Magnetic, Mössbauer and optical spectroscopic properties of the AFe3O(PO4)3 (A = Ca, Sr, Pb) series of powder compounds

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