Structural and magnetic properties with large reversible magnetocaloric effect in (La_1-xPr_x)_0.85Ag_0.15MnO₃(0.0 ≤x≤ 0.5) compounds

La0.85Ag0.15MnO3 Yapısına Eu Katkılamasının Yapısal, Manyetik ve Manyetokalorik Özelliklere Etkisi

“…The grains are settled closely packed and their distribution is homogeneous confirmed by plotting grain size distribution taking 100 randomly selected grains in the structure (see Fig.2b). The average grain size is found as 0.72 μm which is much smaller than LAM sample (1.23 μm) [14]. In the EDX spectrum, we have observed all the expected element peaks without impurity (see inset of Fig.2a), which means no loss of any integrated elements, and no impurity element during the sintering process occurred.…”

“…The TC is found as 192 K for Eu:LAM sample. Although the concentration of Eu is only 10% compared to La in the main lattice, the critical temperature decreases from 262 K to 192 K by the substitution of Eu 3+ for La 3+ [14]. The reason of decreasing in TC can be explained that the decreasing <rA> and values yield to decrease of the local stress in MnO6 octahedron, causing the increasing rotation in MnO6 octahedron [20,21].…”

“…So far, divalent alkaline earth elements doped manganites have been extensively examined to understand their magnetocaloric and physical properties [2,[9][10][11]. However, monovalent elements doped manganites and/or the effect of changing trivalent elements with La ions have become relatively new works in the magnetocaloric community [1,[11][12][13][14][15]. In monovalent element doped manganites, researchers pay attention to the structure of La1-xAgxMnO3 series due to their large MCE values and convenient TC values for practical applications [16,17].…”

(La0.8Gd0.2)0.85Ag0.15MnO3 Perovskit Manganit Sisteminde Gd Yer Değiştirmesinin Yapısal Manyetik ve Manyetokalorik Özellikleri Üzerine Etkisi

“…MC community works on wide range of material families to find optimized magnetic cooling materials such as manganites [4][5][6][7], La-Fe-Si alloys [7] Gd based materials [7], etc. Among them, ABO 3 type manganite compounds attract interests because of having good properties for applications such as low cost, easy elaboration, possible tunable Curie temperature (T C ) and high chemical stability [8].…”

“…These interactions can be determined from the parameters like mismatch effect [13], oxygen stoichiometry [14], average A site ionic size [15] and doping level [16]. In recent years, La site substitution with various 1+ and 2+ cations have been worked to understand the effect of substitution on the properties given above (5,8) [8]. However, the effect of substitution with 3+ cations has not been explained in detail yet [8].…”