Electrical transport and magnetic properties in La0.7Sr0.3MnO3 and SrFe12O19 composite system

Zi, Zhenfa; Sun, Yan; Zhu, Xuebin; Hao, C. Y.; Luo, X.; Yang, Zhaorong; Dai, Jianming; Song, Weiguo

doi:10.1016/j.jallcom.2008.10.027

Cited by 30 publications

(15 citation statements)

References 28 publications

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“…The MR behaviour below the peak is constant in a large temperature window which is good from the application point of view. It is also worthwhile to note that intrinsic MR has increased near the I-M transition temperature and the Ag 2 O addition has not shifted the peak of I-M towards low temperatures as is generally observed in the case of insulating oxides/manganite composites [19][20][21][22]. Thus, enhancement of peak MR in a very narrow temperature window (though the temperature is lower than the room temperature) and the constant value of MR below the MR peak are the salient features of these particular composites systems.…”

Section: Introductionmentioning

confidence: 70%

Intrinsic and extrinsic transport properties of Pr0.67Ba0.33MnO3:Ag2O composites

Panwar

Coondoo

Singh

et al. 2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 70%

Intrinsic and extrinsic transport properties of Pr0.67Ba0.33MnO3:Ag2O composites

Panwar

Coondoo

Singh

et al. 2010

Journal of Alloys and Compounds

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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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“…Perovskite lanthanum manganites, especially those doped LaMnO 3 (LMO), have shown significant potential for application in the field of magnetic electronic functional materials (Zi et al, 2009). Structural modification either through doping of La with Ca, Sr, and Ba (Pissas, Kallias, Hofmann, & Tobbens, 2002;Grossin & Noudem, 2004) or Mn with Fe, Cu, and Ti (Ahn, Wu, Liu, & Chien, 1997;Li et al, 2006;Kallel, Oumezzine, & Vincent, 2008) have been reported to induce electromagnetic properties such as giant magneto resistance (GMR) or colossal magneto resistance (CMR) (Haghiri-Gosnet & Renard, 2003;Ramirez, 1997).…”

Section: Introductionmentioning

confidence: 99%

Particle Size of Mechanically Alloyed La0.5Sr0.5Fe0.5Mn0.25Ti0.25O3 Powders Prepared with the Assistance of Ultrasonic Irradiation

Manaf

Hafizah²

2012

JMSR

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This paper reports the particle size characterisation of mechanically alloyed La 0,5 Sr 0,5 Fe 0,5 Mn 0,25 Ti 0,25 O 3 prepared with the assistance of a high-power ultrasonic treatment. After a solid-state reaction on quasi-crystalline powders at 1000°C for 3 hour, the presence of a single phase was confirmed by X-ray Diffraction (XRD). It was found that powder materials derived from mechanical alloying and successive sintering have several disadvantages, namely, that the particle morphology is seldom controllable and results in large variations in the particle size and distribution. A significant improvement in both particle size and distribution was obtained upon subjecting the mechanically milled powder materials to an ultrasonication treatment for a relatively short period of time. As determined by a particle size analyser, the mean particle size gradually decreased from the original size of 6.23 to 1.13m. A narrow size variation was also observed by Scanning Electron Microscope (SEM). The line broadening analysis by XRD revealed that the particles consist of nanocrystallites with an average size of ~ 22-26 nm. These results indicate that the sintering of mechanically milled particles followed by a high-power ultrasonication treatment promotes the formation of particles containing nanocrystals.

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Electrical transport and magnetic properties in La0.7Sr0.3MnO3 and SrFe12O19 composite system

Cited by 30 publications

References 28 publications

Intrinsic and extrinsic transport properties of Pr0.67Ba0.33MnO3:Ag2O composites

Intrinsic and extrinsic transport properties of Pr0.67Ba0.33MnO3:Ag2O composites

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

Particle Size of Mechanically Alloyed La0.5Sr0.5Fe0.5Mn0.25Ti0.25O3 Powders Prepared with the Assistance of Ultrasonic Irradiation

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