Magnetostructural phase transitions and magnetocaloric effect in Mn(As,P) compounds and their composites

Study on the chemical co-precipitation synthesized CoFe2O4 nanoparticle for magnetocaloric performance in the vicinity of superparamagnetic blocking temperature

“…Materials with a strong magnetocaloric effect around room temperature are crucial for energy conservation and eco-friendly refrigeration, as demonstrated by Brown's 1976 work with gadolinium, though its high cost has driven the search for cheaper alternatives [ 6 ]. The rise of nanoscience and nanotechnology has spurred an extensive investigation into a variety of nanocrystalline materials, including Gd-based alloys, La₀.₈Na₀.₂MnO₃, MnAs-based compounds, RE₂BaTMO₅, Ba₂Gd(BO₃)₂F, Sr₁₄.₀₆Gd₁₄.₆₃(BO₃)₂₄, RE₂BaCuO₅ (RE = Er, Sm, and Dy), and Er₂BaCu₀.₅Ni₀.₅O₅ oxides, suggesting a broad exploration of diverse options for effective magnetocaloric materials [ [7] , [8] , [9] , [10] , [11] , [12] ]. Wang et al have recently identified the magnetocaloric properties of REOCl ( RE = Ho, Dy,Tb, and Gd) compounds, revealing substantial magnetocaloric effects at low temperatures [ 13 ].…”

Extraordinarily strong magneto-responsiveness in phase-separated LaFe2Si

“…Energy-efficient, environmentally-benign magnetocaloric cooling, or, more generally, magnetocaloric heat pumping, has become a lively subject of research following discoveries of the giant magnetocaloric effect in Gd 5 Si 4-x Ge x [1] and a few other families of materials [2][3][4][5][6][7][8] , and laboratory demonstration of a heat pump, where the giant magnetocaloric effect of LaFe 13-x Si x H y was put to use [9] . Giant magnetocaloric effects arise from first-order magnetic phase transformations (FOMPTs), hence significant hysteresis and poor thermal transport remain two materials-related basic science challenges that impede the transitioning of the magnetocaloric cooling technologies to market [ 10 , 11 ].…”

Magnetocaloric materials for hydrogen liquefaction produced by rotating disk atomization

“…However, like many MCMs with first-order transitions this material suffers from large losses due to hysteresis [31]. It has been found that hysteresis can be reduced by exchanging small amounts of As with Sb, Si, and P [11,29,[32][33][34]. However, doping with these agents can lead to significant reduction of the MCE and observed degradation of MCE in cyclic magnetic fields [34].…”