Photocatalytic Activity, Negative AC‐Electrical Conductivity, Dielectric Modulus, and Impedance Properties in 0.6 (Al_0.2La_0.8TiO₃) + 0.4 (BiFeO₃) Nanocomposite

Abstract

A series of nanocomposites with a chemical formula of (1−x) (Al0.2La0.8TiO3) + x (BiFeO3)/ALTBF is prepared through low temperature hydrothermal method. The tetragonal phases are detected at x = 0.2 and the x = 0.4–0.8 composites show the existence of cubic phases. The transmission electron microscope pictures show the presence of well‐defined spherical particles for all composites. Furthermore, photocatalytic activity is observed for x = 0.2–0.8 composites during time intervals ranging from 0 to 240 min. The x = 0.2, 0.6, and 0.8 nanocomposites reveal the usual behavior of ac‐electrical conductivity (σac), dielectric modulus parameters (M′ and M″), and impedance parameters (Z′ and Z″). However, interestingly, x = 0.4 composite performs the negative values of electrical parameters like σac, M′, M″, and Z″. This implies that x = 0.4 composite behaves like a metamaterial possessing negative indexed electrical parameters. Therefore, x = 0.4 composite can be well suited for microwave device applications at high frequency.

Structural, Dielectric, and Magnetic Studies of ZnCuFe2O4 Nanoparticles

“…It was attributed to the mobility of charge carriers for the longer distances, and thus, they cannot have the ability to control their mobility. Hence, restoring force will be diminished [17]. On the other hand, the increase of input frequency allowed increasing the M', and M" values.…”

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

“…On the other hand, the region above the relaxation will be associated with the short-range mobility of carriers which can produce the shortrange polarization [22]. Further, it leads to the shortrange hopping conduction mechanism due to the confinement of carriers to the potential well [21]. In addition, the M 0 versus M 00 plots (Fig.…”

“…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].…”

“…9, it was noticed that the M 0 , and M 00 showed almost zero values. This manner was inferred due to the lack of sufficient strength to the charge carriers to control the mobility by having restoring force [21]. Therefore, the charge carriers can move for longer distances.…”

Structural and Dielectric Properties of (1-x) (Al0.2La0.8TiO3) + (x) (BiZnFeO3) (x = 0.2 − 0.8) nanocomposites

“…Further, the nanocomposites were synthesized including the AlLaTiO3, and studied for the similar properties. These materials were of ALTBT [1], ALTBFO [5,6], LCET [7], and AELTO [2] revealing the nanorod formation, negative dielectric behavior, and defect dipole formation, respectively. This indicated a fact that the more advanced properties were achieved on mixing the barium titanate, bismuth iron oxide, and europium oxide.…”