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Synthesis and characterization of the phosphates Na1+xMg1+xCr2−x(PO4)3 (x = 0; 0.2) and NaZnCr2(PO4)3 with the α-CrPO4 structure

hal.structure.identifierMatériaux Inorganiques
dc.contributor.authorSOUIWA, Khalifa
hal.structure.identifierMatériaux Inorganiques
dc.contributor.authorHIDOURI, Mourad
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorTOULEMONDE, Olivier
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDUTTINE, Mathieu
hal.structure.identifierMatériaux Inorganiques
dc.contributor.authorBEN AMARA, Mongi
dc.date.issued2015
dc.identifier.issn0925-8388
dc.description.abstractEnThree isostructural chromium phosphates, Na1+xMg1+xCr2−x(PO4)3 with x = 0 (I) and 0.2 (II), and NaZnCr2(PO4)3 (III) have been synthesized for the first time. Their analysis by single and powder X-ray diffraction techniques showed that they crystallize in the orthorhombic system with space group Imma. The structure is closely related to that of the α-CrPO4 type with one main feature being a disorder, in the studied compounds, between the Cr3+ and M2+ (M = Mg or Zn) cations. The 3D framework is built up by PO4 tetrahedra, M(1)O6 octahedra and M(2)2O10 bioctahedral units of edge sharing octahedra, linked through common corners and edges. This framework delimits interesting tunnels in which the Na+ cations are located.The observed bands in the FT-IR spectra for I and III were assigned to corresponding vibrations of the PO4 tetrahedra. The EPR spectra exhibit two different resonance lines S1 and S2, characteristic of octahedral Cr3+ ions. The thermal evolution of EPR integral intensities of these signals were assigned to antiferromagnetic (AFM) coupling between nearest neighbors Cr3+ ions. The AFM ordering within these compounds at low temperature was also revealed from the thermal dependence of the molar magnetic susceptibility. At high temperature, a deviation from the Curie–Weiss law is observed and it was attributed to a magnetic frustration phenomenon.
dc.language.isoen
dc.publisherElsevier
dc.subject.enChromium phosphates
dc.subject.enCrystal structure
dc.subject.enFT-IR
dc.subject.enEPR
dc.subject.enMagnetic measurements
dc.title.enSynthesis and characterization of the phosphates Na1+xMg1+xCr2−x(PO4)3 (x = 0; 0.2) and NaZnCr2(PO4)3 with the α-CrPO4 structure
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jallcom.2014.12.002
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Alloys and Compounds
bordeaux.page153-160
bordeaux.volume627
bordeaux.peerReviewedoui
hal.identifierhal-01110643
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01110643v1
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