Multifunctionality of lanthanum–strontium manganite nanopowder

Abstract

The established results expand the understanding of the practical use of manganite perovskites as multifunctional nanomaterials with a unique combination of magnetic, magnetothermal, and electrocatalytic properties.

Expansion of the multifunctionality in off-stoichiometric manganites using post-annealing and high pressure: physical and electrochemical studies

“…[15][16][17] Therefore, perovskites are multifunctional compounds with the prospect of practical applications in various industries. 16,18 This implies the need for a comprehensive study of the functional properties of new materials based on the perovskites to expand their potential.…”

Novel Multiferroic‐Like Nanocomposite with High Pressure‐Modulated Magnetic and Electric Properties

“…The powders for the TEM analysis were prepared by placing a drop of a diluted mixture of particles and acetone on a carbon‐coated copper grid. An average particle size D was obtained from analysis of SEM and TEM images within clear and defined particle borders using Nano Measure 1.2.5 software [ 57 ] during approximation of the experimental values of D by different distribution functions. It should be noted that obtaining clear images was quite complex due to magnetic attraction between the nanoparticles and their agglomeration in the high‐temperature FM ordered MZFO nanopowder (see below Section 3.2).…”

“…The FE properties based on the P ( E ) hysteresis loops measured in the alternating electric field E at room temperature were studied on a Precision Multiferroic II analyzer equipped with a charge‐based magnetoelectric response tester using diamond anvil cell. [ 57 ] The gasket with 300 µm in thickness of the pre‐indented stainless steel was placed on the symmetric diamond anvil cell with a culet diameter of 400 µm. The ground bulk samples were loaded into a cylindrical hole with a diameter of about 150 µm, together with a few ruby chips for pressure calibration.…”

Smart magnetic nanopowder based on the manganite perovskite for local hyperthermia

“…57 However, lanthanum-strontium manganite is not suitable to the smart material for magnetic hyperthermia, since it does not have a sharp magnetic phase transition at T C and the Curie temperature is above the range of 42-44 C of hyperthermia. 59 A nonmonotonic behavior of the SLP(T) dependence follows from the relation between the spontaneous magnetization M S (T) and the relaxation time s R (T) in eqn (4). In the La 0.6 -Ag 0.2 Mn 1.2 O 3 nanopowder with s 0 ¼ 1.7 Â 10 À12 s, K eff ¼ 7.123 Â 10 3 erg cm À3 and D 0 ¼ 65.3 nm, the relaxation time decreases from s R ¼ 3.243 s at T ¼ 250 K to 0.024 s at T ¼ 300 K and 0.007 s at T ¼ 315 K. At a frequency f ¼ 90 kHz, taking into account the resonance condition 2pf 0 Â s R (T) ¼ 1, it follows that SLP(T) should take the maximum value at T ¼ 490 K. However, the SLP increases inversely with a decrease in s R (T) within the temperature range from 250 to 310 K, since M S (T) varies slightly.…”