Structure and diffuse dielectric study of CCT1-xBixO thin film for x=0.02 synthesized via untraditional sol-gel route

Mishra, Amrita; Dwibedy, Debasis; Panigrahi, Manas Ranjan; Devi, Maya

doi:10.1016/j.physb.2020.412673

Cited by 4 publications

(4 citation statements)

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“…CaCu 3 Ti 4 O 12 (CCTO) ceramics, due to its giant dielectric constant (ε r ) and simple preparation method, have been widely studied [1][2][3][4][5]. However, the practical application of CCTO ceramics is limited due to its high dielectric loss [4][5][6][7][8][9][10][11][12][13][14]. Many experiments focus on the reduction of dielectric loss tangent (tanδ) in CCTO ceramics from the following three methods.…”

Section: Introductionmentioning

confidence: 99%

“…The decrease in grain size means that the number of series insulating grain boundaries increases, which leads to an increase in the resistance of the ceramic [3]. Sol-gel and hydrothermal methods are to synthesize ceramics with nanoscale grains [7][8][9]. There are also emerging synthetic methods used to synthesize ceramics with nanoscale grains, such as accelerated sintering using electric elds [10].…”

Section: Introductionmentioning

confidence: 99%

“…The liquid phase, the driving force of grain growth, promotes grain growth [5]. By introducing sintering additives such as P 2 O 5 [11], Bi 2 O 3 [7] and halogen element [8], the formation of the liquid phase can be suppressed. Secondly, the tanδ is reduced by enhancing the heterogeneity between grains and grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

“…These intergranular phases inhibit crystal growth and increase the resistance of grain boundaries. These studies not only provided experimental basis for the mechanism of giant permittivity, but also provided ideas and methods for improving the ε r and reducing the tanδ of CCTO ceramics [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Effect of ZrO2 Doping on the Microstructure and Dielectric Properties of Ca0.97Y0.03Cu3Ti4-xZrxO12 Ceramics

WEI

Zhang

et al. 2021

Preprint

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Dielectric properties of CaCu3Ti4O12 (CCTO) ceramics were studied by doping amount of Zr4+ donor on the basis of doping Y3+ donor. Ca0.97Y0.03Cu3Ti4-xZrxO12 (x=0, 0.005, 0.010, 0.015, CYCTZO) ceramics were prepared by reaction sintering method, and the phase structure, microstructure and dielectric properties of the ceramics were studied. The single phase CCTO was detected in all ceramic samples. SEM images of samples showed a high density and uniform-sized microstructure, and the average grain sizes of the ceramics was reduced with increasing content of Zr4+ donor. Interestingly, the dielectric constant (εr) was increased significantly while the dielectric loss tangent (tanδ) was decreased with the suitable doping amount of Zr4+. CYCTZO ceramics with x=0.010 exhibited a relatively high εr value of 1.02×105 at 1kHz. Meanwhile, the improved grain boundaries response and dielectric properties were closely related to the strengthened grain boundaries resistance (Rgb). The present results indicate that the εr was improved and the tanδ was reduced by doping Zr4+ donors in Ca0.97Y0.03Cu3Ti4O12 (CYCTO) ceramics and explained that the electrical properties were closely related to the electrical heterogeneity of ceramic grains and grain boundaries.

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