Dielectric properties of CaCu3Ti4O12 improved by chromium/lanthanum co-doping

Ardakani, Hamed Ahmadi; Alizadeh, Morteza; Amini, Rasool; Ghazanfari, Mohammad Reza

doi:10.1016/j.ceramint.2012.02.005

Cited by 38 publications

(6 citation statements)

References 22 publications

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“…To the best of our knowledge, the only report of improvement in the dielectric properties of CCTO by co-doping was for La and Cr codoped CCTO ceramics [25]. There are no reports on improvement of CCTO dielectric properties by co-doping in Ca 2+ and Cu 2+ sites.…”

Section: Introductionmentioning

confidence: 95%

A novel approach to achieve high dielectric permittivity and low loss tangent in CaCu3Ti4O12 ceramics by co-doping with Sm3+ and Mg2+ ions

Boonlakhorn

Kidkhunthod

Thongbai

2015

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 95%

A novel approach to achieve high dielectric permittivity and low loss tangent in CaCu3Ti4O12 ceramics by co-doping with Sm3+ and Mg2+ ions

Boonlakhorn

Kidkhunthod

Thongbai

2015

Journal of the European Ceramic Society

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“…1946 Ω for the sample of 1 -723, to 809 Ω for 1 -823, and to 628 Ω for 1 -923. As the sintering at higher temperature principally results in a higher density of the bulk material, , the potential porosities within the samples sintered at lower temperatures can act as nonconductive barriers for the ion transfer through the microstructure. The experimentally determined band gap of 1.64 eV (vide infra), in combination with Fe–Fe distances of 2.6808(4)–3.8495(3) Å, would not suggest a predominant electronic contribution to the electrical impedance, while a predominant ionic Na···S interaction, the high dielectric values that sharply drop at comparably low frequencies, and the presence of statistically distributed Fe vacancies would suggest an ionic contribution.…”

Section: Resultsmentioning

confidence: 99%

Low-Cost, Multifunctional, and Sustainable Sodium Sulfido Ferrate(II)

Ghazanfari,

Siemensmeyer,

Santhosh

et al. 2023

Inorg. Chem.

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We introduce Na2[Fe3S4], comprising anionic layers, synthesized by a simple and straightforward solid-state method based on the fusion of binary sulfides of abundant sodium and iron. The structure crystallizes in a trigonal lattice with honeycomb cavities, as well as 25% of statistical iron vacancies in the crystal structure. The compound depicts high dielectric constants from 998 to 1850 at a frequency of 1 kHz depending on the sintering temperature, comparable with benchmark dielectric materials. According to the complex electrochemical impedance results, the compound depicts an electrical conductivity at ambient temperature. Optical investigations reveal a band gap of 1.64 eV, which is in agreement with an electronic band gap of 1.63 eV computed by density functional theory calculations. Magnetometry results reveal an antiferromagnetic behavior with a transition at 120 K. These findings introduce Na2[Fe3S4] as a sustainable multifunctional material with potential for a variety of electronic and magnetic applications.

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“…5(a)-(d)) and a compact structure, which further generated higher resistivity and lower dielectric loss. In addition, all the dielectric loss is almost independent of frequency in the range of 10 3 -10 5 except for pure CCTO ceramics, as a consequence of the more stability of grain boundary resistance (due to smaller grains and consequently the greater number of grain boundaries [21,22]) at the broad frequency range.…”

Section: Methodsmentioning

confidence: 95%