Magnetotransport properties and magnetocaloric effect of (La0.7Ba0.3MnO3)1-x/(Al2O3)x composites have been investigated through their theoretical and experimental studies. The Al2O3 addition increases the resistivity, showing up a crossover from 3D Mott to the soft gap variable range hopping (VRH). The relative cooling power of LBMO matrix (~98.77 Jkg−1, H = 2 T) is approximately 65 percentage of that of pure Gd ... إقراء المزيد

The effect of aluminum on (La0.7Ba0.3MnO3)1-x/(Al2O3)x composites is investigated based on their crystal structure, thermoelectric power and magnetic properties. The X-ray diffraction process reveals that the composite still exhibits a rhombohedral perovskite structure (R3¯C) of all composites. The thermoelectric power data satisfies the Magnon and Phonon-drag models in the low-temperature range, and the smaller Polaron conduction mechanism in the high-temperature ... إقراء المزيد

Magnetoresistive, magnetic and thermoelectric properties of the La0.7Ba0.3MnO3/xNiO system are studied. The x-ray diffraction shows the coexistence of the NiO and the La0.7Ba0.3MnO3 phases in doped composites, revealing their interaction lack. This suggests the precipitation of the NiO at grain boundaries and on the La0.7Ba0.3MnO3 surface, interrupting the conduction between grains. Hindering the direct contact between the La0.7Ba0.3MnO3 grains increases ... إقراء المزيد

The physical properties, such as electric and optical properties, of metal-Schiff base complexes have been widely investigated. However, their thermoelectric (TE) properties remain unreported. This work presents Cu(II)-Schiff base complexes as promising materials for TE power generation. Therefore, three Cu(II)-Schiff base complexes (namely, [Cu(C32H22N4O2)].3 2H2O, [Cu(C23H17N4O7Br)], and [Cu(C27H22N4O8)].H2O) have been synthesized in nanosized scale. The electric and TE properties have ... إقراء المزيد

(Nd0.6Sr0.4MnO3)1-x/(CrO3)x with x = 0.0–0.030 step 0.005 weight% composites have been prepared by the solid state reaction process. The X-ray and scanning electron microscopic manifest that all composites are a single orthorhombic phase and there are no CrO3 grains separated from NdSrMnO matrix. The electrical measurements have revealed an increase of resistivity and a decrease of metal semiconductor transition with ... إقراء المزيد

find the miller indicies of 6 planes of a cubic abcdefhg length of ab= 1 unit إقراء المزيد