BADRI, Abdessalem; HIDOURI, Mourad; LÓPEZ, María Luisa; VEIGA, Maria Luisa; WATTIAUX, Alain; BEN AMARA, Mongi

doi:10.1016/j.ssi.2009.10.012

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BADRI, Abdessalem
Matériaux Inorganiques

HIDOURI, Mourad
Matériaux Inorganiques

LÓPEZ, María Luisa
Departamento de Quimica Inorganica I, Facultad de Ciencias Quimicas

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Solid State Ionics. 2009, vol. 180, n° 36-39, p. 1558-1563

Elsevier

Résumé en anglais

A new iron phosphate, KMgFe(PO4)2 has been synthesized and investigated by X-ray diffraction, Mössbauer spectroscopy and ionic conductivity. This compound crystallizes in the monoclinic space group C2/c with the parameters a = 18.529(7) Å, b = 5.402(3) Å, c = 9.374(9) Å, β = 120.64(5)° and Z = 4. Its original structure can be described as the stacking along the [101] direction of [MgFe(PO4)−2]∞ layers of corner-sharing MO4 (M = 0.5 Fe + 0.5 Mg) and PO4 tetrahedra. The K+ ions are occupying the inter-layer space. The Mössbauer spectroscopy confirms the occurrence of only tetrahedral Fe3+ ions and gives a definitive proof of the disordered character of their distribution. Ionic conductivity results obtained by the impedance spectroscopy technique show that this material is a two-dimensional ionic conductor, with low activation energy, 0.51 eV, that is interpreted on the basis of two-dimensional pathways.< Réduire

Mots clés en anglais

Iron phosphate

Layered structure

X-ray diffraction

Mössbauer spectroscopy

Ionic conductivity

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The layered iron phosphate KMgFe(PO<sub>4</sub>)<sub>2</sub>: Crystal structure, Mössbauer spectroscopy and ionic conductivity

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