Effect of Co substitution on magnetocaloric effect in La0.67Pb0.33Mn1−xCoxO3 (0.15≤x≤0.3)

Dhahri, N.; Dhahri, A.; Cherif, K.; Dhahri, J.; Belmabrouk, Hafedh; Dhahri, E.

doi:10.1016/j.jallcom.2010.07.222

Cited by 49 publications

(15 citation statements)

References 25 publications

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“…Roy and Das [26] investigated the effects of particle size on the electrical transport and magnetic properties of La 0. 5 [28]. It was found that the maximum change in magnetic entropy for La 0.67 Pb 0.33 Mn 0.7 Co 0.3 O 3 is 3.22 J/(kg K) at Curie temperature, T C = 260 K for a magnetic field change of 1 T. The magnetic field and temperature dependence of the magnetic susceptibility of La 0.9 Ca 0.1 CoO 3 single crystal has been measured by Szymczak et al [29].…”

Section: Introductionmentioning

confidence: 99%

Effect of frozen spin on the magnetocaloric property of La0.7Ca0.3CoO3 polycrystalline and single crystal samples

Debnath

Zeng

Kim

et al. 2012

Journal of Alloys and Compounds

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a b s t r a c t Polycrystalline (PC) and single crystalline (SC) samples of La 0.7 Ca 0.3 CoO 3 (LCCO) with the perovskite structure were synthesized by conventional solid-state reaction and the floating-zone growth method. We conducted isothermal magnetization measurements of the PC and SC samples at temperatures from 2.8 K to 140 K, and evaluated the magnetic entropy change (− S M ) under zero field cooling (ZFC) and field cooling (FC) to 2.8 K. An interesting result has been obtained, where the − S M -T curves in the low temperature range show totally different features between the ZFC and FC cooling procedures. The − S M shows a large inverse irreversibility value for the ZFC process, while the − S M also shows a normal positive value, but one that is slightly larger at 2.8 K for the FC process for both samples. We also present the results of a comprehensive investigation of the magnetic properties of the LCCO system. Systematic measurements have been conducted on DC magnetization, AC susceptibility, and exchange-bias. These findings suggest that complex structural phases, including ferromagnetic and spin-glass/cluster-spinglass (SG/CSG)) states and their transitions, exist in PC samples, while there is a much simpler magnetic phase regime in SC samples. It was also of interest to discover that the CSG induced a magnetic field memory effect and an exchange-bias-like effect.

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Section: Introductionmentioning

confidence: 99%

Effect of frozen spin on the magnetocaloric property of La0.7Ca0.3CoO3 polycrystalline and single crystal samples

Debnath

Zeng

Kim

et al. 2012

Journal of Alloys and Compounds

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“….) have been widely investigated due to their remarkable physical and chemical properties, their potential applications in technology, their unusual colossal magnetoresistive (CMR) property as well as their magnetocaloric effect (MCE) [1][2][3][4]. The parent compound, REMnO 3 is a charge-transfer (CT) insulator with trivalent manganese in different layers coupled among themselves antiferromagnetically through a superexchange mechanism.…”

Section: Introductionmentioning

confidence: 99%

Effects of non magnetic aluminum Al doping on the structural, magnetic and transport properties in La0.57Nd0.1Sr0.33MnO3 manganite oxide

Tka

Cherif

Dhahri

et al. 2011

Journal of Alloys and Compounds

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“…A comparison between the maximum magnetic entropy change, the Curie temperature and the relative magnetic cooling efficiency of several manganese perovskites which could be used for room temperature magnetic refrigerators is summarized in Table 2. Figure 4 depicts the values of the magnetic contribution to the specific heat capacity using (7). The value of C P suddenly changes from positive to negative around the Curie temperature (T C ) and rapidly decreases with decreasing temperature.…”

Section: Model Application and Discussionmentioning

confidence: 99%

“…These properties are much demanded, in addition to high MCE, to realize affordable magnetic refrigeration at room temperature for domestic application. Experimentally, a number of works reported the MCE in lanthanum manganites with a large magnetocaloric effect [6,7] such as La 0.7 Ca 0.3 MnO 3 , La 0.62 Gd 0.05 CaMnO 3 , and La 0.46 Sr 0.54 MnO 3 having a second-order magnetic phase transition. A large magnetocaloric effect makes manganites excellent candidates for magnetic refrigeration units.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Work on Magnetocaloric Effect in La0.67Ba0.23Ca0.10Mn0.90Cr0.10O3 Manganite

Abassi

Dhahri

Hlil

2015

J Supercond Nov Magn

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Magnetocaloric properties of the La 0.67 Ba 0.23 Ca 0.10 Mn 0.90 Cr 0.10 O 3 system near a second-order phase transition from a ferromagnetic (FM) to a paramagnetic (PM) state are investigated. By using a phenomenological model, we can predict the values of the magnetocaloric properties by calculating magnetization as a function of temperature under different external magnetic fields. The magnetic entropy change and the specific heat are obtained. The model parameters were determined and were used to give better fits to magnetic transition. A good agreement is obtained when the numerically predicted results are compared to the experimentally obtained curves. The maximum magnetic entropy change ( S M ) for La 0.67 Ba 0.23 Ca 0.10 Mn 0.90 Cr 0.10 O 3 is found to be 578 J/kg K under a magnetic field of 5 T with an RCP value of 193 J/kg for the composition. The ( S M ) distribution is much more uniform than that of gadolinium (Gd), which is desirable for an Ericson-cycle magnetic refrigerator. These characteristics make manganite a promising candidate for magnetic refrigeration at near room temperature.

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Effect of Co substitution on magnetocaloric effect in La0.67Pb0.33Mn1−xCoxO3 (0.15≤x≤0.3)

Cited by 49 publications

References 25 publications

Effect of frozen spin on the magnetocaloric property of La0.7Ca0.3CoO3 polycrystalline and single crystal samples

Effect of frozen spin on the magnetocaloric property of La0.7Ca0.3CoO3 polycrystalline and single crystal samples

Effects of non magnetic aluminum Al doping on the structural, magnetic and transport properties in La0.57Nd0.1Sr0.33MnO3 manganite oxide

Theoretical Work on Magnetocaloric Effect in La0.67Ba0.23Ca0.10Mn0.90Cr0.10O3 Manganite

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