Determination of cation distribution in spinels by X-ray diffraction method

Furuhashi, Hiroshi; Inagaki, Michio; Naka, Shigeharu

doi:10.1016/0022-1902(73)80531-7

Cited by 153 publications

(41 citation statements)

References 9 publications

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“…[16][17][18] The known room-temperature spinel crystal structure was determined by Rietveld refinement of the diffraction pattern using the space group F d3m. A small impurity phase was detected in the GeFe 2 O 4 sample and was determined to be 5.…”

Section: Resultsmentioning

confidence: 99%

Structural distortion below the Néel temperature in spinelGeCo2O4

et al. 2014

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A structural phase transition from cubic F d3m to tetragonal I41/amd symmetry with c/a > 1 is observed at TS = 16 K in spinel GeCo2O4 below the Néel temperature TN = 21 K. Structural and magnetic ordering appear to be decoupled with the structural distortion occurring at 16 K while magnetic order occurs at 21 K as determined by magnetic susceptibility and heat capacity measurements. An elongation of CoO6 octahedra is observed in the tetragonal phase of GeCo2O4. We present the complete crystallographic description of GeCo2O4 in the tetragonal I41/amd space group and discuss the possible origin of this distortion in the context of known structural transitions in magnetic spinels. GeCo2O4 exhibits magnetodielectric coupling below TN. The related spinels GeFe2O4 and GeNi2O4 have also been examined for comparison. Structural transitions were not detected in either compound down to T ≈ 8 K. Magnetometry experiments reveal in GeFe2O4 a second antiferromagnetic transition, with TN1 = 7.9 K and TN2 = 6.2 K, that was previously unknown, and that bear a similarity to the magnetism of GeNi2O4.

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Section: Resultsmentioning

confidence: 99%

Structural distortion below the Néel temperature in spinelGeCo2O4

et al. 2014

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“…The absorption and temperature factors are not taken into account in our calculation because these factors do not affect the relative intensity calculations for spinels at room temperature. The structure factor formula for the plane (h k l) is taken from those reported by Furuhashi [11]. The multiplicity and Loretnz polarization factors are taken from literature [12].…”

Section: Xrd Analysismentioning

confidence: 99%

Effect of cation distribution on the structural and magnetic properties of nickel substituted nanosized Mn–Zn ferrites prepared by co-precipitation method

Venkataraju

Sathishkumar²,

Sivakumar

2010

Journal of Magnetism and Magnetic Materials

113

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“…When zinc ions are substituted for nickel ions in Ni 1 À x Zn x Fe 2 O 4 nano ferrite samples, the zinc ions prefer to occupy the tetrahedral sites, hence the general molecular formula is where I hkl and F hkl is the relative integrated intensity and structure factor of the (hkl) plane, P is the multiplicity factor and L p is Lorentz polarization factor. The structure factor formulae for the (hkl) planes are calculated using the equations from [16]. The multiplicity factor and Lorentz polarization factor were taken from [17].…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%