Applications of The Mössbauer Effect to The Characterization of Materials

Long, Gary J.; Grandjean, Fernande

doi:10.1007/978-1-4757-9226-3_6

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“…The Mossbauer spectra measured between 85 and 220 K were obtained under fixed geometry conditions with a room temperature source. Hence it is possible to use the temperature dependence of the logarithm of the spectral absorption area and of the isomer shift to obtain information [20,21,30] about the lattice dynamics of n-Fe2(P04)0. The slope of the In area with temperature is -1.15 X 10-3K-'.…”

Section: Mossbauer Spectramentioning

confidence: 99%

A neutron diffraction and Mossbauer effect study of the (FeO₂)_nferromagnetic sheets in antiferromagnetic alpha -Fe₂(PO₄)O

Ijjaali¹,

Malaman²,

Venturini³

et al. 1991

J. Phys.: Condens. Matter

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An unusual feature of the mixed-valence compound a-Fe,(P04)0 is the presence of rig-zag chains of face-sharing octahedra running parallel to [OlO] and containing, alternately, Fe'+ and Fe3+ ions. These chains form sheets with the composition (FeO,). and, bemuse of the presence of face-sharing octahedra, have a very short Fe'*-Fe3+ distance of 2.97. A. The magnetic properties of ru-Fe,(PO,)O have been studied by powder neutron diffraction behveen4.2and280 Kand by thcMossbauereffect behveen4.2and295 K. Below the Ndel temperature of 218(3) K, the neutron diffraction data indicate a magnetostriction predominantly along the +axis, magnetic moments at 4.2K of 3.82(4)fiB for Fez* and 4.26(5)p8 for Fe3+ oriented parallel to [OlO], and the presence of ferromagnetic sheets, containing the zigzag chains, which are coupled into an overall antiferromagnetic structure. The net antiferromagnetic coupling is the result of a dominant 134' Fe3+-O(l)-Fe3* intenheet superexchange pathway. Ferromagnetic coupling dominates within the sheets and, asaresult, theentiremagneticstructureavoidsanyspinfrustration. Above220K,the MBssbauereffectspectraareparamagneticand show hvoquadrupole doubletswithhyperhe parameters corresponding to the discrete Fe'+ and Fe'+ valence states. Below 220 K, the MBssbauer effect spectra show two magnetic componentswith hyperfine parameters charac-teristicofdiscreteFe2'andFe"ionsandinagreementwith thecorrespondingparamagnetic valuesand the magneticstructure.

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Section: Mossbauer Spectramentioning

confidence: 99%

A neutron diffraction and Mossbauer effect study of the (FeO₂)_nferromagnetic sheets in antiferromagnetic alpha -Fe₂(PO₄)O

Ijjaali¹,

Malaman²,

Venturini³

et al. 1991

J. Phys.: Condens. Matter

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Applications of The Mössbauer Effect to The Characterization of Materials

Cited by 1 publication

References 92 publications

A neutron diffraction and Mossbauer effect study of the (FeO₂)_nferromagnetic sheets in antiferromagnetic alpha -Fe₂(PO₄)O

A neutron diffraction and Mossbauer effect study of the (FeO₂)_nferromagnetic sheets in antiferromagnetic alpha -Fe₂(PO₄)O

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Applications of The Mössbauer Effect to The Characterization of Materials

Cited by 1 publication

References 92 publications

A neutron diffraction and Mossbauer effect study of the (FeO2)nferromagnetic sheets in antiferromagnetic alpha -Fe2(PO4)O

A neutron diffraction and Mossbauer effect study of the (FeO2)nferromagnetic sheets in antiferromagnetic alpha -Fe2(PO4)O

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A neutron diffraction and Mossbauer effect study of the (FeO₂)_nferromagnetic sheets in antiferromagnetic alpha -Fe₂(PO₄)O

A neutron diffraction and Mossbauer effect study of the (FeO₂)_nferromagnetic sheets in antiferromagnetic alpha -Fe₂(PO₄)O