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

Abstract

Abstract A series of nanocomposites with a chemical formula of (1− x ) (Al 0.2 La 0.8 TiO 3 ) + x (BiFeO 3 )/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 ( σ ac ), 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 σ ac , 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.