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Unusual metallic behavior in nanostructured cobalt ferrite at superparamagnetic regime
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10.1063/1.4754855
/content/aip/journal/jap/112/6/10.1063/1.4754855
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/6/10.1063/1.4754855

Figures

Image of FIG. 1.
FIG. 1.

XRD pattern of cobalt ferrite for the samples RT, 60 °C, and 90 °C (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 2.
FIG. 2.

Nyquist plots of cobalt ferrite of RT sample (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 3.
FIG. 3.

Variation of Rgb with temperature for the samples RT, 60 °C, and 90 °C (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 4.
FIG. 4.

Calculation of activation energy from ln σ(Scm−1) vs 1000/T for the samples RT, 60 °C, and 90 °C (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 5.
FIG. 5.

Variation of ac conductivity with frequency for the sample RT (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 6.
FIG. 6.

Calculation of activation energy from ac conductivity (ln σ1T (Scm−1 K) vs 1000/T) for the samples RT, 60 °C, and 90 °C (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 7.
FIG. 7.

Variation of “n” with temperature for the samples RT, 60 °C, and 90 °C (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 8.
FIG. 8.

Variation of dielectric constant (ε′) with frequency for the sample 60 °C (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 9.
FIG. 9.

Temperature dependence of ε′ at various frequencies for the sample 60 °C (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 10.
FIG. 10.

Calculation of activation from ln ωp(radian) vs 1/T for the samples RT, 60 °C, and 90 °C (a) sintered at 350 °C and (b) sintered at 600 °C.

Image of FIG. 11.
FIG. 11.

M-H curves of cobalt ferrite for the samples RT, 60 °C, and 90 °C (a) sintered at 350 °C and (b) sintered at 600 °C.

Tables

Generic image for table
Table I.

Particle size, lattice parameter (a), saturation magnetization (Ms), and coercivity (Hc) of cobalt ferrite.

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/content/aip/journal/jap/112/6/10.1063/1.4754855
2012-09-28
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Unusual metallic behavior in nanostructured cobalt ferrite at superparamagnetic regime
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/6/10.1063/1.4754855
10.1063/1.4754855
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