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Moyo, T.; Msomi, J. Z.; Bharuth‐Ram, K.

doi:10.1023/a:1020591228739

Cited by 8 publications

(9 citation statements)

References 6 publications

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“…The values of lattice parameters obtained here compare very well with those reported for similar compounds [2,4,5]. Replacement of Cu with the larger sized Zn (0.74 Å ) or Cd (0.97 Å ) ions result in increase in lattice parameter and densities, which is consistent with the systematic trends observed previously [6].…”

Section: Resultssupporting

confidence: 91%

“…The X-ray densities, grain sizes and lattice parameters of the samples, determined from the XRD patterns, as well as the bulk densities and porosity, are listed in Table I. The FX-ray_ densities (r x ) were calculated from the lattice constants derived from the XRD patterns associated with the unit cell of the spinel lattice. The percentage porosity (P) of the samples were deduced from the bulk and X-ray densities [5,6], while the grain sizes were calculated from the broadening of the line width of (311) X-ray diffraction line using the Scherrer formula. The values of lattice parameters obtained here compare very well with those reported for similar compounds [2,4,5].…”

Section: Resultsmentioning

confidence: 99%

“…Samples of (Zn, Cd, Cu) 0.5 Ni 0.5 Fe 2 O 4 were prepared by solid-state reaction technique from high purity starting oxides, following preparation procedures reported previously [5,6]. X-ray diffraction measurements were made on the samples using monochromatic beam of Co (K ) radiation (wavelength l = 1.78897 Å ), to ensure that the samples crystallized in the cubic spinel phase, and to obtain information on the lattice constant, mean grain size, density and porosity of the samples.…”

Section: Methodsmentioning

confidence: 99%

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Mössbauer Studies on (Zn, Cd, Cu)0.5Ni0.5Fe2O4 Oxides

et al. 2004

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The temperature dependence of the magnetic hyperfine fields on 57 Fe nuclei at the tetrahedral (A) and octahedral (B) interstitial sites in (Zn, Cd, Cu) 0.5 Ni 0.5 Fe 2 O 4 oxides have been investigated in Mössbauer measurements at sample temperatures ranging from 79 K to 850 K. The samples were prepared by solid-state reaction, and their phase determined from XRD measurements, which also provided information on their X-ray densities, grain sizes and lattice constants. The magnetic transition temperatures between ordered and paramagnetic states were obtained from zero-velocity measurements. The Cu 0.5 Ni 0.5 Fe 2 O 4 sample is found to be antiferromagnetic with Néel temperature of 823 K, and its super-exchange interactions, J AB , J AA and J BB were determined to be j24.14 k B , j13.10 k B and +11.68 k B , respectively. The (Zn, Cd) 0.5 Ni 0.5 Fe 2 O 4 are ferrimagnetic with Curie points of 543 and 548 K, respectively, and corresponding average exchange integrals J o = 186 k B and 188 k B .

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Mössbauer Studies on (Zn, Cd, Cu)0.5Ni0.5Fe2O4 Oxides

et al. 2004

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“…Th e Mossbauer studies of the CuFez04 oxide has be en presented in refer enc e [1]. We made the NiFe z0 4 compound by solidstate reaction discussed in previous works [7][8][9]. Single phase formation of the compound was confirmed by X-r ay diffr action as shown in Fig.…”

Section: The Intrasublattice Interactions (A-o-a) and (B-o-b)mentioning

confidence: 87%

“…However the temperature analysis of the hyperfin e fields as a function of temper ature (Bhr(T)) has not been exha ustive [1][2][3][4][5][6][7][8] .…”

Section: The Intrasublattice Interactions (A-o-a) and (B-o-b)mentioning

confidence: 99%