Magnetocaloric properties of Cd-substituted perovskite-type manganese oxides

Synthesis, Magnetic Properties, Magnetic Entropy and Arrot Plot of Antiferromagnetic Frustrated Er2Ti2O7 Compound

“…Also, as can be seen, the effective magnetic moment value, determined at room temperature (μ exp eff = 13.48 µ B ), is very close to the theoretical effective paramagnetic value (μ exp eff = 13.54 µ B ). On the other hand, in the past few years, measurements on powder samples in high magnetic fields turned out a practical tool for studying the magnetic susceptibility, in many binary and ternary compounds formed from 3d transition elements (M) and rare-earth elements (Ln) [33][34][35][36][37]. For this reason, it can be seen that for Er 2 Ti 2 O 7 compound, the isotherms measurements between 50 and 100 K (Fig.…”

Study of the La0.2235Pr0.2235Nd0.2235Sr0.33MnO3ceramic by X ray diffraction and impedance spectroscopy

“…No traces of secondary phases were detectable, within the sensitivity limits of the experiment (a few percent). The perovskite structure is a network oxide with the general formula ABO 3 . In LPNSM system A-site is occupied La 3+ =1.216 Ǻ, Pr 3+ = 1.178Ǻ, Nd 3+ = 1.163 Ǻ, Sr 2+ = 1.31 Ǻ and Mn 3+ = 0.71 Ǻ, Mn 4+ = 0.51 Ǻ ion occupied by the B-site of the perovskite.…”

“…Over the past a few years, the manganites with the form of Ln 1-x A x MnO 3 (Ln = trivalent rare earth, A = divalent alkaline earth) have been attracted much attention due to their extraordinary magnetic and electric properties and their promise for the future technological applications [1][2][3]. Electrical conduction in these materials has contributions from grains (bulk), grain boundaries, and electrode specimen interface [4,5].…”

“…Complex Plane Impedance Analysis (CPIA) technique is very useful in solid state electronic systems [6,7]. The present paper aims at analyzing the effect of the A-site cation in perovskite related materials on the electrical properties in order to elaborate new lead-free ceramic with formula La 0.2235 Pr 0.2235 Nd 0.2235 Sr 0.33 MnO 3 . Impedance analysis approach has been used to separate the real and imaginary components of electrical reponse and estimate the relaxation τ m at different temperatures.…”

Effect of potassium doping on physical properties of perovskites La0.8Cd0.2−xKxMnO3

“…These materials reveal many interesting effects such as magnetoresistance [4,5], magnetocaloric [6][7][8], and to the close correlation between structural, magnetic and electrical properties [9][10][11]. The parent compound, LaMnO 3 , is an antiferromagnetic insulator (AFI) characterized by a super exchange coupling between Mn 3+ sites facilitated by a single e g electron which is subjected to strong correlation effects.…”