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Magnetic properties and magnetocaloric effect of La0.8Ca0.2MnO3 nanoparticles tuned by particle size
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10.1063/1.3699037
/content/aip/journal/jap/111/6/10.1063/1.3699037
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/6/10.1063/1.3699037

Figures

Image of FIG. 1.
FIG. 1.

X-ray diffraction patterns of the samples annealed at various temperatures.

Image of FIG. 2.
FIG. 2.

SEM micrograph of samples annealed at various temperatures of (a) 600 °C, (b) 700 °C, (c) 800 °C, and (d) 1000 °C.

Image of FIG. 3.
FIG. 3.

Temperature dependence of magnetization recorded in the ZFC (open symbols) and FC (solid symbols) modes under an applied magnetic field H = 0.01 T. Inset shows the first derivative of M-T curve in FC model for the 17 nm sample.

Image of FIG. 4.
FIG. 4.

Temperature dependence of ZFC magnetization of the 17 nm sample in different applied magnetic fields.

Image of FIG. 5.
FIG. 5.

H dependence of Tp (solid line to guide the eye). Inset: (a) Tp vs H for H ≤ 0.1 T; Dashed curve is the fitting SPM curve extrapolated to the field higher than 0.05 T. (b) Tp vs H for 0.2 T ≤ H ≤ 4.5 T. (c)-(d) Fitting AT line to the experimentally obtained data (circle points). A good agreement was achieved by using parameters:  = 2 for H ≤ 0.05 T  = 2/3 for 0.06 T ≤ H ≤ 0.1 T, and  = 2/3 for 0.2 T ≤ H ≤ 4.5 T.

Image of FIG. 6.
FIG. 6.

(a)-(c) Initial magnetization isotherms M (H) for the 17, 28, and 43nm samples at different temperatures around magnetic transition temperature (TC ). The red curve is the data measured at TC ; (d) Magnetization as a function of applied field at T = 220 K (solid squares) associated to the Langevin behavior (red curve) of 17 nm sample.

Image of FIG. 7.
FIG. 7.

(a)-(c) Arrott plots (H/M vs M2 ) of the 17, 28, and 43 nm samples. The red curve is the data at magnetic transition temperature (TC ); (d) Spontaneous magnetization as a function of temperature for the 17, 28, and 43 nm samples. Solid curve is the fitting data by using the power law form of .

Image of FIG. 8.
FIG. 8.

(a)-(c) Temperature dependence of magnetic entropy change under different magnetic field changes of 0.5–4.5 T; (d) Field dependence of RCP for the selected 17, 28, and 43 nm samples.

Tables

Generic image for table
Table I.

Particle size D of La0.8Ca0.2MnO3 sample annealed at different temperatures Tanneal .

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/content/aip/journal/jap/111/6/10.1063/1.3699037
2012-03-30
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic properties and magnetocaloric effect of La0.8Ca0.2MnO3 nanoparticles tuned by particle size
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/6/10.1063/1.3699037
10.1063/1.3699037
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