Influence of grain size on magnetic and transport properties of polycrystalline La0.8Sr0.2MnO3 manganites

Kameli, P.; Salamati, H.; Aezami, A.

doi:10.1016/j.jallcom.2006.10.078

Cited by 79 publications

(45 citation statements)

References 28 publications

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“…Its high temperature demand and ability to generate impurities easily, which leads to low specific surface area (generally less than 10 m 2 g −1 ) and low catalytic activity, thus limited its usage. Since the morphologies (particle size and particle shape-specific surface area) are important factors for its catalytic activity [18], it is significant to synthesize perovskite La 0.8 Sr 0.2 MnO 3 with high purity and nano-sized particles [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Nano-sized La0.8Sr0.2MnO3 as oxygen reduction catalyst in nonaqueous Li/O2 batteries

Lin

Huang

et al. 2011

J Solid State Electrochem

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Nano-sized La 0.8 Sr 0.2 MnO 3 prepared by the polyethylene glycol assisting sol-gel method was applied as oxygen reduction catalyst in nonaqueous Li/O 2 batteries. The as-synthesized La 0.8 Sr 0.2 MnO 3 was characterized by X-ray diffraction (XRD), scanning electron microscopy, and Brunauer-Emmet-Teller measurements. The XRD results indicate that the sample possesses a pure perovskite-type crystal structure, even sintered at a temperature as low as 600°C, whereas for solid-state reaction method it can only be synthesized above 1,200°C. The as-prepared nano-sized La 0.8 Sr 0.2 MnO 3 has a specific surface area of 32 m 2 g −1 , which is much larger than the solid-state one (1 m 2 g −1 ), and smaller particle size of about 100 nm. Electrochemical results show that the nano-sized La 0.8 Sr 0.2 MnO 3 has better catalytic activity for oxygen reduction, higher discharge plateau and specific capacity.

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Section: Introductionmentioning

confidence: 99%

Nano-sized La0.8Sr0.2MnO3 as oxygen reduction catalyst in nonaqueous Li/O2 batteries

Lin

Huang

et al. 2011

J Solid State Electrochem

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“…One strategy to increase the Curie temperature is the doping of the perovskite-type rare earth magnates. Several methods have been used to synthesize Ln 1−x A x MnO 3 namely, coprecipitation [11][12][13], sol-gel [14], hydrothermal [15], solid-state reaction [16], and ball milling [17]. Among these methods, the sol-gel method has emerged as one of the most widely used methods for the synthesis of nanopowders.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Magnetocaloric Properties of Pr0.8Bi0.2Fe x Mn1−x O3 Compounds with 0 ≤ x ≤ 0.3

Sbissi

Kahn

Ellouze

et al. 2015

J Supercond Nov Magn

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This paper studies the effects of the Mn site substitution by Fe on the magnetic properties and the magnetocaloric properties of Pr 0.8 Bi 0.2 Fe x Mn 1−x O 3 elaborated by a sol-gel method. The variation of the magnetization as a function of temperature and applied magnetic field was carried out. Magnetic measurements show that all the materials exhibit a paramagnetic-ferromagnetic transition when the temperature decreases. The dependence of the Curie temperature (T C ) and the magnetic entropy change ( S M ) when varying the Fe doping content was investigated. The measured value of T C was 114, 97, 94, and 77 K for x = 0, 0.1, 0.2, and 0.3, respectively. The samples with x = 0 and x = 0.1 present a second-order phase transition, while the samples with x = 0.2 and x = 0.3 exhibit a firstorder phase transition. As the concentration of Fe increases, the maximum entropy change, S max M , decreases gradually, from 2.77 J kg −1 K −1 (x = 0) to 1.05 J kg −1 K −1 (x = 0.3), when the magnetic field changes from 0 to 5 T.

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“…For example, strain induced by a magnetic field in a lattice structure is affected by shape memory effects [14]. Also, magnetoresistance varies with crystallite size [15]. In some materials, magnetic properties are affected by lattice parameters [16,17].…”

Section: Introductionmentioning

confidence: 99%

The effect of Fe doping on structural and magnetic properties of nanocrystallite Co ₂ Cr _{1−
x} Fe _x Al Heusler alloys prepared by mechanical alloying

et al. 2012

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Mechanical alloying (MA) has been used to fabricate the Co 2 FeAl Heusler alloy with a nanocrystalline structure. The formation mechanism of the alloy has been investigated.Rietveld analysis showed that all samples that were milled for more than 15 hours had an L2 1 structure with a space group of Fm3m. The crystallite size and internal strain of the samples were calculated using the Williamson-Hall equation. With mechanical alloying of up to 20 hours the crystallite size of Co 2 FeAl increased, after which the crystallite size started to decrease. In contrast, internal strain first decreased during the process and then increased with the increase of milling time. The powder obtained after 20 hours of MA was split into three parts and separately annealed at 300, 500 and 700 o C for 5 hours. A considerable increase was observed in the hardness value of powder particles with the increase of annealing temperature up to 500 o C. However, the hardness value of the sample annealed at 700 o C decreased. It seems that this feature is related to parameters such as increase of crystallite size, enhancement of lattice ordering, change in density of defects and impurities and nonstoichiometric effects.

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Influence of grain size on magnetic and transport properties of polycrystalline La0.8Sr0.2MnO3 manganites

Cited by 79 publications

References 28 publications

Nano-sized La0.8Sr0.2MnO3 as oxygen reduction catalyst in nonaqueous Li/O2 batteries

Nano-sized La0.8Sr0.2MnO3 as oxygen reduction catalyst in nonaqueous Li/O2 batteries

Magnetic and Magnetocaloric Properties of Pr0.8Bi0.2Fe x Mn1−x O3 Compounds with 0 ≤ x ≤ 0.3

The effect of Fe doping on structural and magnetic properties of nanocrystallite Co ₂ Cr _{1−
x} Fe _x Al Heusler alloys prepared by mechanical alloying

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Influence of grain size on magnetic and transport properties of polycrystalline La0.8Sr0.2MnO3 manganites

Cited by 79 publications

References 28 publications

Nano-sized La0.8Sr0.2MnO3 as oxygen reduction catalyst in nonaqueous Li/O2 batteries

Nano-sized La0.8Sr0.2MnO3 as oxygen reduction catalyst in nonaqueous Li/O2 batteries

Magnetic and Magnetocaloric Properties of Pr0.8Bi0.2Fe x Mn1−x O3 Compounds with 0 ≤ x ≤ 0.3

The effect of Fe doping on structural and magnetic properties of nanocrystallite Co 2 Cr 1− x Fe x Al Heusler alloys prepared by mechanical alloying

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The effect of Fe doping on structural and magnetic properties of nanocrystallite Co ₂ Cr _{1−
x} Fe _x Al Heusler alloys prepared by mechanical alloying