Effect of Al substitution and secondary CuO phase on dielectric response in microwave-processed CaCu3Ti4−xAlxO12 ceramics

Dielectric properties of the Ca0.25Cu0.75-xAlxTiO3 ceramics: experimental and computational investigations

“…In the case of CCTO and Al0125 ceramics, the lattice parameters (a) are 7.392 and 7.390 Å, respectively. Comparable results are reported in other studies [1][2][3][4].…”

“…As a consequence, oxygen enrichment at grain boundaries (GBs) is the most likely source of the low tanδ in Mg doped CCTO, according to the literature [8]. The enhanced ε′ associated with a decreased low-frequency tanδ in Aldoped CCTO is most likely the result of microstructural evolution and alteration of the electrical properties of GBs [1,12]. Cu-rich phases could be detected in the microstructure of Al-doped CCTO in these instances.…”

“…In recent years, increased interest in dielectric materials, attributed to their potential technical uses in microelectronic systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14], has encouraged the development of numerous compounds with very high dielectric permittivity (ε′), including co-doped TiO 2 [6], ACu 3 Ti 4 O 12 (A = Ca, Cd, Y 2/3 , Na 1/2 La 1/2 ) [1-5, 10-12, 14], co-doped SnO 2 [7], and others, contributing to recent achievements in dielectric research. Ca 0.25 Cu 0.75 TiO 3 or CaCu 3 Ti 4 O 12 (CCTO) perovskite oxide is one of the most alluring materials.…”

“…Various research groups have investigated the repercussions of metal ion doping. Improved dielectric properties, especially lowering tanδ, can be achieved in Sr 2+ [3], Lu 3+ [5], Mg 2+ [8], Al 3+ [1,12,18,19], Cd 2+ /F − [9], Bi 3+ /Al 3+ [20], and Al 3+ /F − [4] doped CCTO. When doping with various elements, the origins of a decreased tanδ might result from several distinct sources.…”

Modern Synthesis and Sintering Techniques of Calcium Copper Titanium Oxide (CaCu3Ti4O12) Ceramics and Its Current Trend in Prospective Applications: A Mini-Review

“…Wang et al demonstrated the substitution of Nd at the Ca site in CaCu 3 Ti 4 O 12 ceramics and the effects of Nd-substitution on the microstructures and dielectric characteristics [12]. Doping elements of interest to boost the electrical, nonlinear, and I-V properties has been the primary focus of researchers attempting to cater to ceramic fabrication in different application fields based on their properties [13][14][15][16]. This review provides a crisp and clear insight with special emphasis on modern novel synthesis routes such as microwave synthesis, molten salt synthesis, and microwave flash combustion methods to overcome the setbacks of traditional solid-state reaction and sol-gel techniques.…”