Effect of Fe-doping on structural, magnetic and magnetocaloric properties of Nd0.67Ba0.33Mn1−xFexO3 manganites

Modeling the Magnetocaloric Effect of Nd0.67Ba0.33Mn0.98 Fe0.02O3 by the Mean Field Theory

“…Scanning electron microscope (SEM) analysis has indicated that the sample presented a homogeneous morphology which consists of well-formed crystal grains. The SEM analysis coupled with the EDX has confirmed that the chemical composition of the sample is close to that nominal reported by the above chemical formula (19).…”

“…According to the work of Amaral et al, we have reported, in this paper, our studies on the magnetocaloric properties of the Nd 0.67 Ba 0.33 Mn 0.98 Fe 0.02 O 3 sample which exhibits a second-order ferromagnetic-paramagnetic (FM-PM) phase transition [19], by scaling the experimental magnetization. We have showed, in this work, how the mean field theory may adequately model the magnetic and the magnetocaloric properties of this magnetic system, which may be applicant in MR technology.…”

“…In this section, we have summarized the primary results of the structural and magnetic analysis of the manganite sample Nd 0.67 Ba 0.33 Mn 0.98 Fe 0.02 O 3 reported in our precedent work [19].…”

“…This is due to the presence of the magnetic moments of Nd 3þ (Xe ½ 4f 3 Þ which have three electrons in the 4f orbital. Effectively, a comparison between magnetization of the two compounds Nd 0.67 Ba 0.33 MnO 3 [19] and La 0.67 Ba 0.33 MnO 3 [22] are depicted in Figure 3. This figure shows obviously that the lanthanum compound rapidly reaches saturation even under low applied magnetic field.…”

Effect of Pr doping on the properties of Bi0.5−xPrxCa0.5MnO3 (0≤x≤0.50) manganites

“…This coupling is caused by several parameters like disorder in the sample [11], applied pressure [12,13] or applied magnetic and electric field [14,15] and the grain size of the sample [16][17][18][19]. The coupling can be altered by different types of substitutions at A-site [20][21][22] and Bsite [23][24][25], which introduce disorder in the system and in turn affects the crystal structure and properties. The trivalent rare-earth ions doping leads to evolution of different co-existing magnetic phases such as paramagnetic (PM), ferromagnetic (FM), anitferromagnetic (AFM) and…”