Differences between La substitution and doping strategies in dielectric properties of CaCu3Ti4O12 ceramics with low loss

Li1/2Y1/2Cu3Ti4O12 Ceramic: Structural, Dielectric, and Electrical Investigations

“…Without ferroelectric effects, titanate-based ceramics give a very high ε′ value . In a number of scientific articles, the major cause of the high ε′ in these ceramics has been identified. − These compounds are composed of the two components of grains and grain boundaries (GBs), which are consistent with the internal barrier layer capacitor (IBLC) model. − The semiconducting properties of the ACTO grains originate from electron hopping between Cu + ↔ Cu 2+ and Ti 3+ ↔ Ti 4+ . The presence of Cu + and Ti 3+ in the ACTO lattice is induced by anion vacancies like oxygen sites, as previously reported. ,− Due to the specific microstructure, the ε′ value of ACTO ceramics is proportional to their grain size.…”

“…The sizes of the unit cells of our specimens correlate to those described in previous reports in the literature. 4,5,11,19 Utilizing the Rietveld technique, the theoretical density (ρ T ) of both LiY06 and LiY12 ceramics is determined to be 5.15 g/ cm 3 .…”

“…It is anticipated that in the not-too-distant future, the basis for the development of energy storage and memory devices will involve the use of giant dielectric materials that have a high dielectric permittivity (ε′). Having a large ε′, CaCu 3 Ti 4 O 12 (CCTO) and its associated ACu 3 Ti 4 O 12 (ACTO) (A = Y 2/3 , Na 1/2 Sm 1/2 , Cd, Na 1/3 Cd 1/3 Y 1/3 , and Na 1/3 Cd 1/3 Bi 1/3 ) are favored by researchers due to their exceptional temperature stability and frequency stability. − These properties are of utmost importance for developing new technologies for electronic devices. Simple oxide systems such as oxide- and TiO 3 -based ceramics have exhibited a good prospect to be employed as indispensable parts of our home appliances, − for example, as capacitors, varistors, and sensors.…”

“…Recently, numerous works have investigated the effects of powder preparation, sintering, and doping. − , Among the titanates, CCTO is the most desirable ceramic, and therefore, scientists have attempted to enhance their properties and investigated the origins of these properties so that they can be employed in electrical equipment. − In addition to the CCTO ceramic, the structures and dielectric properties of many other ACTO compounds have been studied. Kotb et al proposed that the dielectric characteristics of Na 1/2 La 1/2 Cu 3 Ti 4 O 12 (NLCTO) ceramics are affected by spark plasma sintering (SPS).…”

Effect of Europium Addition on the Microstructure and Dielectric Properties of CCTO Ceramic Prepared Using Conventional and Microwave Sintering

“…Similarly, Figure 2 a–c has illustrated grain sizes of 41.18 ± 15.61 μm and 29.67 ± 9.16 μm at x = 0.1 and 0.3 with minimum grain size at x = 0.3 due to the high Eu content. The solute drag mechanism promoted by the rare earth cations [ 27 , 28 , 29 ] may account for the smaller grains seen in CS samples at x = 0.3. Grain size and structure evolution have also been affected by Eu 3+ occupancy in the CCTO structure [ 30 ].…”