On the role of disorder produced by manganese vacancy at the B site on the structural and magnetic properties of La0.67Ba

Copper-doped lanthanum manganite La0.65Ce0.05Sr0.3Mn1−xCuxO3 influence on structural, magnetic and magnetocaloric effects

“…37 Similar observations have been reported for some other perovskite compounds with distorted rhombohedral lattice. 35,38,39 In this work, we underline the E g mode allowed for the symmetric stretching vibration of oxygen in MnO 6 octahedra. It is reasonable to relate the changes on the E g mode frequency to the modications of the oxygen octahedral MnO 6 .…”

Pr3+ doping at the A-site of La0.67Ba0.33MnO3 nanocrystalline material: assessment of the relationship between structural and physical properties and Bean–Rodbell model simulation of disorder effects

“…These parameters confirm that the refinements are acceptable and the samples compositions are the same as their nominal compositions, including that the oxygen content was close to 3 for all the samples. 22 The three equivalent positions (6a (0, 0, 1/4), 6b (0, 0, 0), and 18e ( x , 0, 1/4)) in the rhombohedral unit cell are occupied by 6a (La 3+ , Pr 3+ , Ba 2+ ), 6b (Mn 3+ , Mn 4+ ), and 18e O 2− respectively. Fig.…”

“…These parameters conrm that the renements are acceptable and the samples compositions are the same as their nominal compositions, including that the oxygen content was close to 3 for all the samples. 22 The three equivalent positions (6a (0, 0, 1/4), 6b (0, 0, 0), and 18e (x, 0, 1/4)) in the rhombohedral unit cell are occupied by 6a (La 3+ , Pr 3+ , Ba 2+ ), 6b (Mn 3+ , Mn 4+ ), and 18e O 2À respectively. Table 1, where a and c are the hexagonal cell parameters, V is the unit cell volume, B iso is the isotropic thermal parameter, q (Mn-O-Mn) is the bond angle, d MnÀO is the bond length and x is the oxygen position.…”

The investigation of structural and vibrational properties and optical behavior of Ti-doped La0.67Ba0.25Ca0.08Mn(1−x)TixO3 (x = 0.00, 0.05 and 0.10) manganites

“…The mode near 300-400 cm À1 corresponds to the E g (1) mode, which are the bending, rotational and stretching vibrations of the MnO 6 octahedra. [33][34][35] We ascribe the E g(2) mode (at 609 and 486 cm À1 ) to the Mn-O and O-Mn-O vibrations, respectively. Fig.…”