TY  - JOUR
AU  - Zentková, M.
AU  - Kovalik, M.
AU  - Mihalik, M.
AU  - Csach, K.
AU  - Gamzatov, A.G.
AU  - Aliev, A.M.
AU  - Iľkovič, S.
AU  - Fitta, M.
AU  - Perović, Marija M.
AU  - Mihalik, M.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10129
AB  - Experimental study of magnetocaloric effect (MCE) was performed by direct and indirect methods on La0.70Ag0.25MnO3+δ nanoparticles with rhombohedral LaAlO3 – type crystal structure (R3¯c space group – No. 167, hP30). The content of oxygen was modified by annealing at 800 °C/48h in different atmosphere (air, O2 and Ar). The Curie temperature TC increases from 250 K to 319.5 K and to 322.9 K with the content of oxygen. The adiabatic temperature change ΔT(4T) = 1.52 K, the change of magnetic entropy −ΔSmax(4T) = 3.96 Jkg−1K−1 and the relative cooling power RCT(4T) = 172 J/kg are maximal for sample treated in Ar and decrease with oxygen content. The frequency dependence of ΔT (f) and the shape of maximum in ΔT (T) and −ΔSmax (T) indicate relaxation processes and presence of magnetic inhomogeneities which are present mostly in sample treated in Ar. The samples demonstrate the stability of the MCE up to 1000 cycles of switching on and off the magnetic field without any signs of degradation
T2  - Journal of Magnetism and Magnetic Materials
T1  - Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles
VL  - 549
SP  - 169002
DO  - 10.1016/j.jmmm.2021.169002
ER  - 

@article{
author = "Zentková, M. and Kovalik, M. and Mihalik, M. and Csach, K. and Gamzatov, A.G. and Aliev, A.M. and Iľkovič, S. and Fitta, M. and Perović, Marija M. and Mihalik, M.",
year = "2022",
abstract = "Experimental study of magnetocaloric effect (MCE) was performed by direct and indirect methods on La0.70Ag0.25MnO3+δ nanoparticles with rhombohedral LaAlO3 – type crystal structure (R3¯c space group – No. 167, hP30). The content of oxygen was modified by annealing at 800 °C/48h in different atmosphere (air, O2 and Ar). The Curie temperature TC increases from 250 K to 319.5 K and to 322.9 K with the content of oxygen. The adiabatic temperature change ΔT(4T) = 1.52 K, the change of magnetic entropy −ΔSmax(4T) = 3.96 Jkg−1K−1 and the relative cooling power RCT(4T) = 172 J/kg are maximal for sample treated in Ar and decrease with oxygen content. The frequency dependence of ΔT (f) and the shape of maximum in ΔT (T) and −ΔSmax (T) indicate relaxation processes and presence of magnetic inhomogeneities which are present mostly in sample treated in Ar. The samples demonstrate the stability of the MCE up to 1000 cycles of switching on and off the magnetic field without any signs of degradation",
journal = "Journal of Magnetism and Magnetic Materials",
title = "Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles",
volume = "549",
pages = "169002",
doi = "10.1016/j.jmmm.2021.169002"
}

Zentková, M., Kovalik, M., Mihalik, M., Csach, K., Gamzatov, A.G., Aliev, A.M., Iľkovič, S., Fitta, M., Perović, M. M.,& Mihalik, M.. (2022). Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles. in Journal of Magnetism and Magnetic Materials, 549, 169002.
https://doi.org/10.1016/j.jmmm.2021.169002

Zentková M, Kovalik M, Mihalik M, Csach K, Gamzatov A, Aliev A, Iľkovič S, Fitta M, Perović MM, Mihalik M. Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles. in Journal of Magnetism and Magnetic Materials. 2022;549:169002.
doi:10.1016/j.jmmm.2021.169002 .

Zentková, M., Kovalik, M., Mihalik, M., Csach, K., Gamzatov, A.G., Aliev, A.M., Iľkovič, S., Fitta, M., Perović, Marija M., Mihalik, M., "Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles" in Journal of Magnetism and Magnetic Materials, 549 (2022):169002,
https://doi.org/10.1016/j.jmmm.2021.169002 . .

TY  - JOUR
AU  - Zentkova, M.
AU  - Mihalik, Marian
AU  - Mihalik, Jr., M.
AU  - Kovalik, M
AU  - Perović, Marija M.
AU  - Vavra, M.
AU  - Briančin, J.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9085
AB  - Annealing of_ non stoichiometric La0.80Ag0.15MnO3 nanoparticles leads to the change of the crystal symmetry from Pnma to R3c and to almost doubling of its Curie temperature from 117 K to 317 K. This effect is due to the releasing of lattice distortions and strengthening of double exchange interaction. The large values of the magnetocaloric entropy of the order of ∆S = 6.19 J/(kg K) were observedat ∆µ0H = 5 T and T = 315 K.
T2  - Acta Physica Polonica A
T1  - Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles
VL  - 137
IS  - 5
SP  - 900
EP  - 903
DO  - 10.12693/APhysPolA.137.900
ER  - 

@article{
author = "Zentkova, M. and Mihalik, Marian and Mihalik, Jr., M. and Kovalik, M and Perović, Marija M. and Vavra, M. and Briančin, J.",
year = "2020",
abstract = "Annealing of_ non stoichiometric La0.80Ag0.15MnO3 nanoparticles leads to the change of the crystal symmetry from Pnma to R3c and to almost doubling of its Curie temperature from 117 K to 317 K. This effect is due to the releasing of lattice distortions and strengthening of double exchange interaction. The large values of the magnetocaloric entropy of the order of ∆S = 6.19 J/(kg K) were observedat ∆µ0H = 5 T and T = 315 K.",
journal = "Acta Physica Polonica A",
title = "Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles",
volume = "137",
number = "5",
pages = "900-903",
doi = "10.12693/APhysPolA.137.900"
}

Zentkova, M., Mihalik, M., Mihalik, Jr., M., Kovalik, M., Perović, M. M., Vavra, M.,& Briančin, J.. (2020). Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles. in Acta Physica Polonica A, 137(5), 900-903.
https://doi.org/10.12693/APhysPolA.137.900

Zentkova M, Mihalik M, Mihalik JM, Kovalik M, Perović MM, Vavra M, Briančin J. Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles. in Acta Physica Polonica A. 2020;137(5):900-903.
doi:10.12693/APhysPolA.137.900 .

Zentkova, M., Mihalik, Marian, Mihalik, Jr., M., Kovalik, M, Perović, Marija M., Vavra, M., Briančin, J., "Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles" in Acta Physica Polonica A, 137, no. 5 (2020):900-903,
https://doi.org/10.12693/APhysPolA.137.900 . .