Processing influence in the CaCu3Ti4O12 electrical properties

Kozlinskei, Lucas Lion; Paes, Alisson T. de Andrade; Grzebielucka, Edson Cezar; Borges, Christiane Philippini Ferreira; Andrade, André Vitor Chaves de; Souza, Éder Carlos Ferreira de; Antunes, Sandra Regina Masetto

doi:10.1007/s00339-020-03629-9

Cited by 7 publications

(5 citation statements)

References 57 publications

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“…This EDS mapping result is similar to those of other reports of the LPS mechanism. 11,12,20 As reported in previous research, the microstructure of Mg 2+ doped CCTO ceramics fabricated using the SSR method and sintered at 1100 C had no signicant size difference. 28 Thus, the Mg 2+ dopant might not substantially impact grain size expansion at a relatively low sintering temperature of 1050 C. According to our previous work, the replacement of dopant at unexpected sites might be a signicant cause of these microstructural changes.…”

Section: Resultssupporting

confidence: 61%

“…The large increase in this ceramic grain size is likely associated with a liquid-phase sintering (LPS) mechanism. 11,12,20 As disclosed in Fig. 3, EDS mapping of the Mg05Al05 ceramic showed that Mg and Al elements have suitable dispersions.…”

Section: Resultsmentioning

confidence: 78%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The development of complex perovskites for use in materials for energy storage applications has been extensively reported over the past ten years. [1][2][3][4][5][6][7][8][9][10][11][12]20 One of the many improvements of ceramic dielectrics and related materials is used as the capacitive components of capacitors. However, almost all ceramic capacitors are produced using ferroelectric materials such as PbTiO 3 .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced dielectric properties with a significantly reduced loss tangent in (Mg²⁺, Al³⁺) co-doped CaCu₃Ti₄O₁₂ceramics: DFT and experimental investigations

et al. 2021

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Section: Resultssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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Enhanced dielectric properties with a significantly reduced loss tangent in (Mg²⁺, Al³⁺) co-doped CaCu₃Ti₄O₁₂ceramics: DFT and experimental investigations

et al. 2021

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Section: Resultssupporting

confidence: 89%

“…It is noteworthy that significant quantities of Cu-rich phases were found within the GB layers. The results derived from this EDS mapping are consistent with the findings documented in earlier studies exploring the LPS mechanism[44,45].The dielectric characteristic of CCTO and Al0125 samples was studied. In the C p -tanδ measuring method, ε′ is computed as dC p /ε 0 A, where d and C p are the sample thickness and the relative capacitance, respectively.…”

supporting

confidence: 88%

Dielectric properties of the Ca_0.25Cu_0.75-xAl_xTiO₃ ceramics: experimental and computational investigations

Boonlakhorn,

Suksangrat,

Srepusharawoot

2024

Mater. Res. Express

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In this study, we employed a solid-state reaction method to synthesize Ca0.25Cu0.75-xAlxTiO3 ceramics, investigating the impact of Al doping at concentrations of x=0 and 0.0125. Notably, all ceramics exhibited a primary phase of Ca0.25Cu0.75TiO3. The addition of Al3+ induced a significant increase in grain size. Density functional theory analyses revealed a preferential occupation of Cu sites by Al, leading to liquid-phase sintering processes attributed to excess Cu. Moreover, it was also found from DFT that the Al dopant cannot induce an oxygen vacancy in the lattice. Charge density analysis revealed that Cu+ and Ti3+ observed via XPS originate from the presence of an oxygen vacancy. The Ca0.25Cu0.7375Al0.0125TiO3 ceramic exhibited a very high dielectric permittivity of 9.23×104 and a low dielectric loss tangent of 0.057 at 1 kHz and room temperature. Importantly, the dielectric permittivity exhibited impressive stability over a temperature range of -60 °C to 110 °C, perfectly meeting the practical requirements for utilization in X6R ceramic capacitors. Our investigation indicates that the improved dielectric properties may be attributed to enhanced grain boundary responses, influenced by oxygen enrichment and the presence of metastable insulating layers at grain boundaries. Combining experimental findings with theoretical evidence, our study elucidates that the excellent dielectric properties of the Ca0.25Cu0.7375Al0.0125TiO3 ceramic originate from an extrinsic effect arising from grain boundary enhancement. This work not only contributes to advancing the understanding of the underlying mechanisms governing dielectric behavior in doped ceramics, but also emphasizes the potential of Ca0.25Cu0.7375Al0.0125TiO3 as a promising material for applications demanding superior dielectric performance.

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Ge4+ doped CaCu2.95Zn0.05Ti4O12 ceramics: Two-step reduction of loss tangent

Boonlakhorn¹,

Chanlek

Manyam

et al. 2021

Ceramics International

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Processing influence in the CaCu3Ti4O12 electrical properties

Cited by 7 publications

References 57 publications

Enhanced dielectric properties with a significantly reduced loss tangent in (Mg²⁺, Al³⁺) co-doped CaCu₃Ti₄O₁₂ceramics: DFT and experimental investigations

Enhanced dielectric properties with a significantly reduced loss tangent in (Mg²⁺, Al³⁺) co-doped CaCu₃Ti₄O₁₂ceramics: DFT and experimental investigations

Dielectric properties of the Ca_0.25Cu_0.75-xAl_xTiO₃ ceramics: experimental and computational investigations

Ge4+ doped CaCu2.95Zn0.05Ti4O12 ceramics: Two-step reduction of loss tangent

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Processing influence in the CaCu3Ti4O12 electrical properties

Cited by 7 publications

References 57 publications

Enhanced dielectric properties with a significantly reduced loss tangent in (Mg2+, Al3+) co-doped CaCu3Ti4O12ceramics: DFT and experimental investigations

Enhanced dielectric properties with a significantly reduced loss tangent in (Mg2+, Al3+) co-doped CaCu3Ti4O12ceramics: DFT and experimental investigations

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

Ge4+ doped CaCu2.95Zn0.05Ti4O12 ceramics: Two-step reduction of loss tangent

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Enhanced dielectric properties with a significantly reduced loss tangent in (Mg²⁺, Al³⁺) co-doped CaCu₃Ti₄O₁₂ceramics: DFT and experimental investigations

Enhanced dielectric properties with a significantly reduced loss tangent in (Mg²⁺, Al³⁺) co-doped CaCu₃Ti₄O₁₂ceramics: DFT and experimental investigations

Dielectric properties of the Ca_0.25Cu_0.75-xAl_xTiO₃ ceramics: experimental and computational investigations