Study of structural properties and conduction mechanisms of La0.67Ca0.2Ba0.13Fe0.97Ti0.03O3 perovskite

Study of physical properties of the Li0.5MgFe1.5O3.5 ferrite nanoparticles

“…56,57 It is also important to point out that Z ′ decreases with the increase in temperature, which can be attributed to the decrease in the density of charge carriers and the increase in their mobility, suggesting a reduction in the localized character of charge carriers. 58,59…”

“…56,57 It is also important to point out that Z ′ decreases with the increase in temperature, which can be attributed to the decrease in the density of charge carriers and the increase in their mobility, suggesting a reduction in the localized character of charge carriers. 58,59 3.7.1.2 Imaginary part of impedance. The frequency and temperature dependent plots of the imaginary part of the impedance (Z ′′ ) for the Li 0.5 MgFe 1.5 O 3.5 sample under study is shown in Fig.…”

Particle Size Effect on Optical and Gas-Sensing Properties of La0.67Ca0.2Ba0.13Fe0.97M0.03O3 (M = Ti4+, Mn3+, and Cr3+) Compounds

“…The Raman spectra of the La 0.67 Ca 0.2 Ba 0.13 Fe 0.97 M 0.03 O 3 (M = Ti 4+ , Cr 3+ , and Mn 3+ ) compounds are shown in Figure 3 for structural comparison. We previously studied the Raman vibrational modes of the La 0.67 Ca 0.2 Ba 0.13 Fe 0.97 Ti 0.03 O 3 compound [44], which showed only 11 active vibrational modes. Furthermore, as previously confirmed in the literature, almost-doped LaFeO 3 ceramics crystalize in an orthorhombic structure that presents twenty-four active Raman modes, as described by the following equation [45]:…”

Study of the effect of the substitution of Fe by Ti on the microstructure and the physical properties of the perovskite system La0.67Ca0.2Ba0.13Fe1−xTixO3 with x = 0 and 0.03 at low temperatures

“…Recent research conducted on La 0.67 Ca 0.2 Ba 0.13 FeO 3 has a valid semiconductor behavior for a wide temperature range. 22 The electrical conduction process is attributed to the correlated barrier jump model. The replacement of Fe by a transition ion (Cr, Mn, Ti, Co…) strongly affects the magnetic, optical, catalytic, electrical and dielectric properties and leads to a strong impact on the ferroelectricity and the piezoelectricity of the aforementioned compound.…”

“…The replacement of Fe by a transition ion (Cr, Mn, Ti, Co…) strongly affects the magnetic, optical, catalytic, electrical and dielectric properties and leads to a strong impact on the ferroelectricity and the piezoelectricity of the aforementioned compound. 22 According to previous research, the substitution of Ti on the Fe–B sites induces unexpected properties compared to its pure compounds 23 The interest in replacing Fe with Ti in ferrites comes from the fact that Ti ions can exist in the structure in a variety of valence and spin–orbital states, as well as the anticipated wide range of magnetic and electrical phenomena linked to various levels of substitution. Ti 4+ ions with (Ar)3d 0 4s 0 electronic configuration have an ionic radius ( r Ti 4+ = 0.605 Å) significantly smaller than that of Fe 3+ ( r Fe 3+ = 0.645 Å).…”