Magnetocaloric effect and magnetic properties of La0.75Ba0.1M0.15MnO3 (M=Na, Ag and K) perovskite manganites

Koubàa, Mohamed; Cheikhrouhou‐Koubaa, W.; Cheikhrouhou, A.

doi:10.1016/j.jallcom.2009.01.030

Cited by 17 publications

(2 citation statements)

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“…The values achieved were DS max ; 2.26, 1.72, and 2.44 J/(kg K), respectively, under a magnetic field change of DH 5 20 kOe. 142 In 2011, Prellier et al 143 grew a series of (La 0.7 Sr 0.3 MnO 3 /SrRuO 3 ) superlattices, where the effect of varying SrRuO 3 layer thickness was examined. A room-temperature MCE was obtained owing to the finite size effect, which reduced the T C of La 0.7 Sr 0.3 MnO 3 layers.…”

Section: H Abo 3 Perovskitesmentioning

confidence: 99%

Magnetocaloric materials: From micro- to nanoscale

et al. 2018

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Section: H Abo 3 Perovskitesmentioning

confidence: 99%

Magnetocaloric materials: From micro- to nanoscale

et al. 2018

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“…There have been some cases where substitution of K + ion increased the maximum −∆S M value of LMO-based compounds. Examples of this can be seen in La 0.7 Sr 0.2 M 0.1 MnO 3 (M = Na, K), La 0.7 M 0.2 M' 0.1 MnO 3 (M = Sr, Ba and M' = Na, Ag, K), and La 0.75 Ba 0.1 M 0.15 MnO 3 (M = Na, Ag, and K) [27][28][29]. On the other hand, there have been several cases where substitution of K + ion reduced the maximum −∆S M value of LMO-based compounds.…”

Section: Introductionmentioning

confidence: 99%

Role of Potassium Substitution in the Magnetic Properties and Magnetocaloric Effect in La0.8−xKxBa0.05Sr0.15MnO3 (0 ≤ x ≤ 0.20)

et al. 2020

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The magnetic and magnetocaloric effects of potassium-substituted La0.8−xKxBa0.05Sr0.15MnO3 (0 ≤ x ≤ 0.20) manganite were explored. The samples in polycrystalline form were synthesized by the sol–gel method, with a final sintering temperature of 1100 °C. Powder X-ray diffraction (XRD) patterns refined by Rietveld refinement show that all samples crystallized in rhombohedral structure with R-3c space group. The unit cell volume of the samples decreases with increasing potassium concentration. In addition, small changes in average bond length and bond angle are also observed in the samples. Scanning electron microscope (SEM) images reveal that the largest average grain size was observed for x = 0.10. Field-cooled (FC) magnetization measurements show that the Curie temperature ( T C ) of the samples increases from 320 K for x = 0 to 360 K for x = 0.2. The largest magnetocaloric (MCE) effect, which is represented by maximum magnetic entropy change (− Δ S M , M A X ), reaches its greatest value for the x = 0.10 sample. The monotonous increase in T C suggests that TC is mainly governed by the ferromagnetic coupling between Mn ions induced by the changes on average bond length and bond angle. The obtained − Δ S M , M A X value suggests that MCE property is more sensitive to Zener theory of double exchange, which is strongly related to the Mn3+/Mn4+ ratio of the samples.

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