Non-Ohmic properties of MgTiO3 doped CaCu3Ti4O12 thin films deposited by magnetron sputtering method

Emergence of Dielectric Properties by Doping of Semi‐Transition Metal in Semiconductor Complex Perovskite Oxide

“…[ 6,7 ] Several methods have been used in investigations of the grain boundaries of CCTO materials. [ 8,9 ] The IBLC hypothesis, which holds that a significant intrinsic potential barrier existed at the CCTO grain boundaries, is supported by S. Y. Chung's proof of the insulator–semiconductor junction assumption. For the gigantic dielectric permittivity, several theoretical models have received widespread acceptance, although they are still debatable.…”

Enhanced dielectric response and non-Ohmic properties of Cd-doped Na1/3Ca1/3Bi1/3Cu3Ti4O12 ceramics

“…Intrinsic mechanisms (such as local carrier jumping [9]) and extrinsic peculiarities (e.g., twin boundaries [3], defects [10], and internal barrier layer capacitance (IBLC)) have been used so far to explain the origin of the giant dielectric constant of CCTO. Among them, the widely employed IBLC model considers the microstructure of semiconductive grains and insulating grain boundaries (GBs) [11][12][13][14]. Excessive charges, passing through the grains and accumulating at the insulated GBs, ensure a high dielectric constant (ε′) in the external electric field.…”

“…Excessive charges, passing through the grains and accumulating at the insulated GBs, ensure a high dielectric constant (ε′) in the external electric field. This also causes the excessive dielectric loss (tanδ > 0.1) of CCTO, which limits its application prospects [2,4,6,[11][12][13][14]. Moreover, CCTO also possesses good non-Ohmic properties, which makes it a dual-functional material with dielectric and varistor characteristics [7,11,[14][15][16][17].…”

“…This also causes the excessive dielectric loss (tanδ > 0.1) of CCTO, which limits its application prospects [2,4,6,[11][12][13][14]. Moreover, CCTO also possesses good non-Ohmic properties, which makes it a dual-functional material with dielectric and varistor characteristics [7,11,[14][15][16][17].…”

Significantly improved non-ohmic and giant dielectric response in CaCu3Ti4O12 ceramics by incorporating Portland cement

“…CCTO is one of the most interesting giant dielectric oxides. It has been intensively studied for purely scientific and technological reasons [1,[12][13][14][15][16][17][18]. This is because CCTO and related ACu 3 Ti 4 O 12 (A=Cd 2+ , Na + 1/2 Bi 3+ 1/2 , Na + 1/2 Y 3+ 1/2 , Na + 1/3 Ca 2+ 1/3 Bi 3+ 1/3 , etc) ceramics can exhibit very high ε′ values of about 10 3 -10 5 at room temperature, depending on sintering conditions [12][13][14].…”