Synthesis, Characterization, and Magnetic Properties of A(2)Co(2)Fe(VO4)(3) (A = Ag or Na) Alluaudite-Type Vanadates

Mohammed Hadouchi (1) , Abderrazzak Assani (2) , Mohamed Saadi (3) , Abdelilah Lahmar (1) , Mimoun El Marssi (1) , Mohammed Sajieddine (4) , Lahcen El Ammari (2)

1 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081
2 LCAM - Laboratoire de Chimie Appliquée des Matériaux [Rabat]
3 METIS - Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols
4 USMS - Université Sultan Moulay Slimane

We successfully synthesized the polycrystalline form of vanadates A(2)Co(2)Fe(VO4)(3) (A = Ag or Na) using sol-gel method. Powder X-ray diffraction analysis allowed the identification of the alluaudite-type vanadate structure. The morphology and the elemental composition of the synthesized powders were analyzed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometer (EDS). The two vanadates A(2)Co(2)Fe(VO4)(3) (A = Ag or Na) were further characterized by infrared and Raman spectroscopies to get complementary structural information. The infrared and Raman spectroscopy-observed bands were assigned to VO43- vibration modes. The room temperature Fe-57 Mossbauer spectroscopy confirmed the +III oxidation state of iron. Magnetic properties of these vanadates were investigated. The magnetic susceptibility data reveal that the predominant interactions in these vanadates are antiferromagnetic with a Curie-Weiss constant of theta=-125.6K for Na2Co2Fe(VO4)(3) and theta=-104.5K for Ag2Co2Fe(VO4)(3). The magnetic interactions in these vanadates were discussed according to semiempirical Goodenough-Kanamori-Anderson rules (GKA).

Domaines: Matière Condensée [cond-mat]

Mohammed Hadouchi, Abderrazzak Assani, Mohamed Saadi, Abdelilah Lahmar, Mimoun El Marssi, et al.. Synthesis, Characterization, and Magnetic Properties of A(2)Co(2)Fe(VO4)(3) (A = Ag or Na) Alluaudite-Type Vanadates. Journal of Superconductivity and Novel Magnetism, 2019, 32 (8), pp.2437-2446. ⟨10.1007/s10948-018-4964-5⟩. ⟨hal-03627567⟩