Effect of Al substitution on the structural and magnetic properties of Co-Zn ferrites

Murali, N.; Margarette, S.J.; Kumar, Gagan; Sailaja, B. B. V.; Mulushoa, S. Yonatan; Himakar, P.; Bonige, Kishore Babu; Veeraiah, V.

doi:10.1016/j.physb.2017.07.043

Cited by 47 publications

(14 citation statements)

References 29 publications

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“…Os resultados mostram que todas as amostras como fabricadas podem ser consideradas nanométricas, uma vez que o tamanho médio dos cristalitos é menor que 100 nm. Pode-se observar também que o parâmetro de rede aumenta e a massa específica diminui com o aumento da concentração de zinco, o que está de acordo com os resultados relatados por VAIDYANATHANet al [12][13][14], que utilizaram amostras sintetizadas por outro método. Tabela 1.Parâmetros obtidos a partir dos difratogramas de raios X das amostras de Co 1-x Zn x Fe 2 O 4 .…”

Section: 1resultados E Discussãounclassified

SÍNTESE E CARACTERIZAÇÃO DE NANOPARTÍCULAS DE Co(1-X)ZN(X)Fe2O4 UTILIZANDO O MÉTODO DE COMBUSTÃO

Figueiredo¹,

Carvalho²,

Aguilera³

et al. 2019

ABM Proceedings

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Resumo Nanopartículas da ferrita mista Co 1-x Zn x Fe 2 O 4 , com x variando entre 0 e 1, foram sintetizadas pelo método da combustão homogênea e caracterizadas por difração de raios X (DRX) e ressonância ferromagnética (RFM). Os resultados mostraram que o método permite obter partículas com cristalitos menores que 20 nm e que o campo de anisotropia das partículas diminui com o aumento da concentração de zinco. Palavras-chave:Nanopartículas; Ferrita mista; Combustão homogênea. SYNTHESIS AND CHARACTERIZATION OF Co 1-X Zn X Fe 2 O 4 NANOPARTICLES USING THE COMBUSTION METHOD

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Section: 1resultados E Discussãounclassified

SÍNTESE E CARACTERIZAÇÃO DE NANOPARTÍCULAS DE Co(1-X)ZN(X)Fe2O4 UTILIZANDO O MÉTODO DE COMBUSTÃO

Figueiredo¹,

Carvalho²,

Aguilera³

et al. 2019

ABM Proceedings

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“…The estimated crystallite sizes were found to depend on the type of estimation method and on the Zn constant (x). Values of the crystallite sizes were found to be in the ranges (26)(27)(28)(29)(30)(31)(32)(33)(34) nm, (61-102) nm and (of order of few mm) for the D-S, W-H and SEM methods respectively. Values of the relative integrated areas under the peak vary in the same manner, the areas increase as Zn content increases.…”

Section: Discussionmentioning

confidence: 96%

“…Values of the ionic radii at the tetrahedral and octahedral sites can be calculated using the following relations [29];…”

Section: The X-ray Diffraction Analysismentioning

confidence: 99%

Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg1-xZnxFeNiO4 Spinels

Khalaf¹

2019

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The effects of Zn 2+ ions substitutions on the Debye-Waller Factors, structure factor and other related structural properties of the Mg 1-x Zn x NiFeO 4 (where 0.0≤x≤1.0) spinels have been investigated using the XRD, TEM, SEM and FT-IR tools. The Mg 1-x Zn x NiFeO 4 samples were prepared using the conventional ceramic solid state sintering techniques at temperatures around 1100°C. The Mg 1-x Zn x NiFeO 4 spinels have predominantly inverse type structure with inversion factor, λ in the range 0.69 to 0.36. The X-ray diffraction (XRD) patterns of all compositions showed the formation of cubic spinel structure. The lattice constant "a" increases from 8.3397Å for MgFeNiO 4 to 8.3855Å for ZnFeNiO 4 spinels. The increases in lattice parameters have been attributed to the replacement of small Mg 2+ ions (0.66 Å) with the Zn 2+ (0.74 Å) ions of a larger ionic radius. The IR spectra confirm the existence of two main absorption bands υ 1 and υ 2 in the frequency range of (400-1000 cm-1), arising due to the tetrahedral (A) and octahedral (B) stretching vibrations respectively. Values of both υ 1 and υ 2 decrease as Zn content increases. The scanning electron microscope (SEM) and transmission electron microscope (TEM) images showed aggregates of stacked grains. The normalized XRD intensities of the main (hkl) planes were used in the estimation of the Debye-Waller factor. Values of the Debye-Waller factors were estimated to be in the range (0.77-1.44A 2). The calculated and observed relative intensities and areas of the most related plains to cation distributions (i.e.: the (220), (311), (222), (400), (422), (511) and (440) plains) were obtained by normalizing with respect to the most intensive reflection from the (311) plane. An inverse relation between the ordering, Q and inversion, λ factors exists in these partially inverse spinels. Both Q and λ decrease as Zn content (x) increases in the sample. The cation distributions indicate that the sample, MgFeNiO 4 with x=0, λ=2/3 and maximum configurational entropy Sc(=15.876 J/mol, K) should represents the sample of the complete randomness of cation distributions in these spinels and can be written as (Mg 1/3 Fe 2/3)[Mg 2/3 Fe 1/3 Ni 3/3)O 4. In general the variation of the different structural parameters with Zn content lie on two different regions, the first region for x values (0.0-0.6) the "highly normal" and the second region for x values (0.6-1.0) the "highly inverse" type structure.

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“…A similar phenomenon occurs on the A site. The A-B and B-A interaction dominate the A-A and B-B interaction according to as Weiss Molecular field theory resulting in the hysteresis loop [20][21].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

DC Electrical Resistivity and Magnetic Properties of Co Substituted NiCuZn Nano Ferrite

Jayadev

Raju²,

Murali

et al. 2021

Preprint

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Co substituted Ni0.3-xCoxCu25Zn0.45Fe2O4 (x = 0, 0.05, 0.1, 0.15 and 0.2) samples is synthesized using the sol-gel auto-combustion process. X-ray diffraction shows its cubic spinel structure. The lattice constant decreases as the Co content increases. The sizes of the crystallites are in the range of 20.18–26.24 nm. The wavenumbers of tetrahedral and octahedral sites sighted in the FTIR spectra are similar to that of the precursor. The increment on the Co content increases the DC conductivity. The electrical resistivity decrease with increase in the temperature, i.e. it has a negative temperature coefficient with resistance similar to semiconductors. The remnant ratios R obtained from VSM show their isotropic nature forming single domain ferrimagnetic particles. The resultant material is widely significant, as indicated by its result.

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Effect of Al substitution on the structural and magnetic properties of Co-Zn ferrites

Cited by 47 publications

References 29 publications

SÍNTESE E CARACTERIZAÇÃO DE NANOPARTÍCULAS DE Co(1-X)ZN(X)Fe2O4 UTILIZANDO O MÉTODO DE COMBUSTÃO

SÍNTESE E CARACTERIZAÇÃO DE NANOPARTÍCULAS DE Co(1-X)ZN(X)Fe2O4 UTILIZANDO O MÉTODO DE COMBUSTÃO

Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg<sub>1-x</sub>Zn<sub>x</sub>FeNiO<sub>4</sub> Spinels

DC Electrical Resistivity and Magnetic Properties of Co Substituted NiCuZn Nano Ferrite

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Effect of Al substitution on the structural and magnetic properties of Co-Zn ferrites

Cited by 47 publications

References 29 publications

SÍNTESE E CARACTERIZAÇÃO DE NANOPARTÍCULAS DE Co(1-X)ZN(X)Fe2O4 UTILIZANDO O MÉTODO DE COMBUSTÃO

SÍNTESE E CARACTERIZAÇÃO DE NANOPARTÍCULAS DE Co(1-X)ZN(X)Fe2O4 UTILIZANDO O MÉTODO DE COMBUSTÃO

Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg&lt;sub&gt;1-x&lt;/sub&gt;Zn&lt;sub&gt;x&lt;/sub&gt;FeNiO&lt;sub&gt;4&lt;/sub&gt; Spinels

DC Electrical Resistivity and Magnetic Properties of Co Substituted NiCuZn&nbsp;Nano Ferrite

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Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg<sub>1-x</sub>Zn<sub>x</sub>FeNiO<sub>4</sub> Spinels

DC Electrical Resistivity and Magnetic Properties of Co Substituted NiCuZn Nano Ferrite