Structure and magnetocaloric properties of La1−xKxMnO3 manganites

Aliev, A. M.; Gamzatov, A. G.; Batdalov, A. B.; Mankevich, A. S.; Korsakov, I. E.

doi:10.1016/j.physb.2010.12.021

Cited by 46 publications

(26 citation statements)

References 37 publications

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“…Among manganites, the manganites doped with univalent metals, such as Ag, K, and Na are of greatest interest, because their physical properties are very sensitive to magnetic eld at room temperature. Group of La 1−x K x MnO 3 manganites provides a series of new oxides to study magnetocaloric eect [2,3] and insulator-to-metal transition [4] at room temperature.In our paper we study the eect of annealing on magnetic properties of La 0.8 K 0.2 MnO 3 nanoparticles.The preparation of nanoparticles followed the glycinenitrate method, where glycine was used as a fuel and nitrates as oxidants [5]. The as prepared samples were annealed for 2 hours in air atmosphere at 300…”

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Magnetic Properties of La_{0.8}K_{0.2}MnO_{3} Nanoparticles

et al. 2014

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Magnetic properties of La0.8K0.2MnO3 have been studied on nanoparticles prepared by glycine-nitrate method. Crystal structure and particles size were modied by heat treatment. Crystal structure changes from orthorhombic (space group Pbma ) to rhombohedral (space group R-3c) after annealing at 600• C/2 hours. The average size of particle varies with annealing from about 30 nm to 135 nm. The Curie temperature TC and the saturated magnetization µs increase with annealing. The exchange bias eect was observed on samples with particles size smaller than 60 nm. DOI: 10.12693/APhysPolA.126.312 PACS: 75.50.-y, 75.47.Lx, 75.30.-m, 75.30Kz The mixed-valence manganese oxides of the general formula La 1−x A x MnO 3 (A is a divalent ion like Ca, Sr, Ba and Pb) are a subject of interest due to a desire to understand and exploit the large negative magnetoresistance and magnetocaloric eects [1]. Among manganites, the manganites doped with univalent metals, such as Ag, K, and Na are of greatest interest, because their physical properties are very sensitive to magnetic eld at room temperature. Group of La 1−x K x MnO 3 manganites provides a series of new oxides to study magnetocaloric eect [2,3] and insulator-to-metal transition [4] at room temperature.In our paper we study the eect of annealing on magnetic properties of La 0.8 K 0.2 MnO 3 nanoparticles.The preparation of nanoparticles followed the glycinenitrate method, where glycine was used as a fuel and nitrates as oxidants [5]. The as prepared samples were annealed for 2 hours in air atmosphere at 300• C, 600• C and 900• C. Fig. 1. X-ray powder diraction patterns for all samples; arrows point to the contribution from sample holder. * corresponding author; e-mail: mihalik@saske.sk The X-ray powder diraction (XRD) measurements have been carried out on the X'Pert PRO diractometer with Cu-K α radiation (λ 1 = 1.54056 Å, λ 2 = 1.54440 Å) and the XRD patterns were evaluated with the FullProf program based on the Rietveld method [6]. The as prepared sample and sample annealed at 300• C adopt orthorhombic crystal structure (space group Pnma ) with lattice parameters a = 0.5570(5) nm; b = 0.7773(9) nm; c = 0.5525(1) nm. The crystal structure changes to rhombohedral (space group R-3c) with annealing, a = 0.5512(6) nm; c = 1.3385(2) nm for the sample annealed at 900• C. MnO 6 the building blocks of the crystal structures are distorted and tilted. The average size of nanoparticles depends on annealing and varies between 30 nm and 135 nm. The morphology of nanoparticles and their size distribution was studied on powders by scanning electron microscope (SEM) MIRA3 TESCAN. Magnetization and AC susceptibility measurements were performed by a SQUID (MPMS XL−5) or in a VSM (PPMS) magnetometer in the temperature range from 1.8 K to 380 K and in magnetic eld up to 9 T.Hysteretic behaviour (see Fig. 2) between ZFC and FC magnetization is a characteristic feature of the system.(312)

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Magnetic Properties of La_{0.8}K_{0.2}MnO_{3} Nanoparticles

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“…The defined composition is practically identical within an error of the analysis to the composition specified at synthesizing. Minute results of structural researches of La 1−x K x MnO 3 system are presented in work [21].…”

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Critical behavior of La0.87K0.13MnO3 manganite

Gamzatov

Aliev

Khizriev

et al. 2011

Journal of Alloys and Compounds

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“…Recently, the same type of manganites doped with univalent metals, such as Ag, K, and Na become of great interest, because their physical properties are very sensitive to a magnetic field at room temperature. Group of La 1−x K x MnO 3 manganites provides a series of new oxides to study magnetocaloric effect [2,3] and insulator-to-metal transition [4] at room temperature.…”

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Effect of the Jahn-Teller Distortion on Double Exchange Interaction in La_{0.8}K_{0.2}MnO_3 Nanoparticles

et al. 2017

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Electric resistance and effect of hydrostatic pressure on magnetic properties has been studied on the La0.8K0.2MnO3 nanoparticles. Magnetic phase transition is affected by pressure only slightly, the Curie temperature TC decreases with the rate of -1.02 K/GPa, on samples with orthorhombic structure where the Jahn-Teller distortion of lattice is large. On the other hand, TC increases with the rate of 20.1 K/GPa on samples with rhombohedral structure, where the Jahn-Teller distortion of lattice is absent. Insulator type of electrical resistance is characteristic feature of sample with large Jahn-Teller distortion of lattice and insulator-metal transition was observed on samples where the Jahn-Teller distortion is negligible. Our results are in line with theoretical calculation predicting that double exchange interaction is suppressed by the Jahn-Teller distortion.

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Structure and magnetocaloric properties of La1−xKxMnO3 manganites

Cited by 46 publications

References 37 publications

Magnetic Properties of La_{0.8}K_{0.2}MnO_{3} Nanoparticles

Magnetic Properties of La_{0.8}K_{0.2}MnO_{3} Nanoparticles

Critical behavior of La0.87K0.13MnO3 manganite

Effect of the Jahn-Teller Distortion on Double Exchange Interaction in La_{0.8}K_{0.2}MnO_3 Nanoparticles

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