Induced dielectric behavior in high dense AlxLa1-xTiO3 (x = 0.2–0.8) nanospheres

Abstract

The present work focussed on the preparation and characterization of Al x La 1−x TiO 3 (x = 0.2-0.8) (ALTO) nanospheres. The phase purity and tetragonal structure was confirmed using the X-ray diffraction patterns. In addition, the dimensions of the ALTO unit cell were decreased with increase of Al-content. The morphological investigations evidenced the formation of spherical grains and particles of nano size. The UV-Visible spectra revealed the increasing trend of band gap (E g) from 3.341 to 3.378 eV as a function 'x'. Besides, the frequency, and compositional variation of dielectric parameters was described. Subsequently, the space charge polarization, and electrical conduction mechanisms were well understood using the complex dielectric modulus, and impedance spectroscopy. The Cole-Cole plots ensured that the ALTO materials exhibited the semiconducting nature due to the formation of complete semicircular arcs. Moreover, the non-Debye type relaxations were noticed in Cole-Cole plots.

Optical and functional properties of hydrothermally synthesized tetragonal Ba0.4Cu0.6−xLaxTiO3 (x = 0.2–0.6) nanoparticles

“…It was very much clear from figure 9. The similar trend was reported by the previous scientists in the literature [37][38][39][40][41][42][43][44][45][46]. In addition, the frequency dependence of ε′ as well as ε″ plots revealed the non-Debye type relaxations over the frequency range from 4 to 5 MHz.…”

Structure, morphology, dielectric, and impedance properties of (1-x) (Al0.2La0.8TiO3) + (x) (CuTiO3) (x = 0.2–0.8) nanocomposites

“…Thus, the different kinds of charges anchoring onto the nanocomposite matrix through the non-bonding orbitals, for positive or negative ions can reinforce the local charge separation [20]. Hence, the x = 0.2 and 0.8 samples offering negative dielectric loss behavior can provide applications in waveguides, filters, antenna, electromagnetic cloaking devices, and perfect microwave absorbers [21][22][23].…”

“…Furthermore, the ac-electrical conductivity was calculated using a relation r ac : e o e 00 x, where e o is the permittivity of free space, and the other symbols have their usual meaning [23]. The r ac versus log x plots were drawn (Fig.…”

Structural, Dielectric, and Magnetic Studies of ZnCuFe2O4 Nanoparticles

“…This was attributed to the mobility of mobile charges within the samples. The long-range and short-range polarization regions were observed in the M"-log ω plots on either side of relaxation portions such as below, and above the relaxation regions, respectively [18][19][20]. The magnetic behavior of the ZnCu ferrite samples was well understood using the magnetization versus magnetic eld (M-H) curves as depicted in Fig.…”