Effects of A, B-site multiple ion co-doping on the structure, magnetic, magnetocaloric effect, and critical behavior of La0.7-xNd0.1Sr0.2KxMn0.95Ni0.05O3 ceramics

Investigation of the impact of A-site cation disorder on the structure, magnetic properties, and magnetic entropy change of trisubstituted divalent ions in La0.7(Ba,Ca,Sr)0.3MnO3 manganite

“…[20][21][22][23][24][25][26][27][28][29] As the bandwidth increases, the overlap between the O-2p and Mn-3d orbitals also increases, leading to a higher exchange coupling among Mn 3+ -O 2À -Mn 4+ ions and the magnetic ordering temperature. 64 Consequently, this proves that T C not only depends on hr A i but also depends on the s 2 value.…”

“…20–29 As the bandwidth increases, the overlap between the O-2p and Mn-3d orbitals also increases, leading to a higher exchange coupling among Mn 3+ –O 2− –Mn 4+ ions and the magnetic ordering temperature. 64 Consequently, this strengthens the double-exchange mechanism and leads to an increase in T C .…”

“…This indicates that ferromagnetic interactions occurred in the paramagnetic phase, explaining the difference between m exp eff and m calc eff . 64…”

Influence of heat sintering on the physical properties of bulk La0.67Ca0.33MnO3 perovskite manganite: role of oxygen in tuning the magnetocaloric response

“…A few examples for this class of materials with a giant MCE are Gd 5 Si 2 Ge 2 , 5,6 Fe-Rh alloys, 7,8 La(Fe,Si) 13 -based alloys, 9,10 MnAs Heusler alloys [11][12][13] and RE 1Àx A x Mn 1Ày TM y O 3 (RE -rare earth metal, A -divalent/monovalent ion, TM -transition metal) perovskite manganites. [14][15][16][17][18][19] Among perovskite manganites, lanthanum-based mixedvalence manganites with the general formula La 1Àx A x MnO 3 (A is mostly a divalent ion, Ca, Ba or Sr) show a variety of fascinating properties, like colossal magnetoresistance (CMR), [20][21][22] charge ordering (CO), 23,24 phase separation (PS), 25,26 the magnetocaloric effect (MCE), 1,[27][28][29][30] etc. For (La,Ca)MnO 3 , both end members LaMnO 3 and CaMnO 3 are typical antiferromagnets with T N close to 140 K and 130 K, respectively.…”

“…A few examples for this class of materials with a giant MCE are Gd 5 Si 2 Ge 2 , 5,6 Fe–Rh alloys, 7,8 La(Fe,Si) 13 -based alloys, 9,10 MnAs Heusler alloys 11–13 and RE 1− x A x Mn 1− y TM y O 3 (RE – rare earth metal, A – divalent/monovalent ion, TM – transition metal) perovskite manganites. 14–19…”