Extreme effects of Na doping on microstructure, giant dielectric response and dielectric relaxation behavior in CaCu3Ti4O12 ceramics

Improved Dielectric and Nonlinear Electrical Properties of Fine‐Grained CaCu3Ti4O12 Ceramics Prepared by a Glycine‐Nitrate Process

“…Usually, a fine‐grained CCTO microstructure with no pores is difficult to fabricate even when sintering at a low temperatures and/or using short reaction times. CCTO ceramic products with small grain sizes sintered at low temperatures and/or using short reaction times usually have residual pores in their microstructure . In contrast, using high temperatures and/or long reaction times results in abnormal grain growth due to a liquid phase sintering mechanism that normally occurs in CCTO ceramics .…”

“…CCTO ceramic products with small grain sizes sintered at low temperatures and/ or using short reaction times usually have residual pores in their microstructure. 14 In contrast, using high temperatures and/or long reaction times results in abnormal grain growth due to a liquid phase sintering mechanism that normally occurs in CCTO ceramics. 13 This is undesirable for many applications.…”

A Novel Route to Greatly Enhanced Dielectric Permittivity with Reduce Loss Tangent in CaCu3−xZnxTi4O12/CaTiO3 Composites

“…Recently, there have been extensive studies of the giant dielectric permittivity of CaCu 3 Ti 4 O 12 (CCTO) materials . This is because CCTO holds promise for use in development of a new generation of multilayer ceramic capacitors.…”

“…Unfortunately, tanδ of CCTO ceramics is still too large (>0.05). This is one of the most serious problems preventing the use of CCTO in capacitor applications …”

Effect of powder size on the microstructure and dielectric properties of ZnO ceramics

“…Most of the currently available capacitor materials with CDC are ferroelectrics such as Pb(Mg 1/3 Nb 2/3 )O 3 , nevertheless, the strong temperature dependence of their dielectric constant (e 0 ) limits their further application [2]. Nowadays there have been many investigations on the CDCs in non-ferroelectric transition metal oxides, and complex perovskite [3][4][5]. The origin of such high dielectric constants is widely believed to be an extrinsic effect of Maxwell-Wagner relaxation resulting from spatial inhomogeneity [6], contact effect [7], and internal barrier layer capacitor [8].…”