Phase structure evolution, crystal structure refinement, morphology, and electro-optical properties of heat-treated Ca0.9Ni0.1Cu2.9La0.1Ti4O12

Mohammed, J.; Carol, T. Tchouank Tekou; Mukhtar, G.; Kumar, Vinod; Bhadu, Gopala Ram; Godara, Sachin Kumar; Maji, Pradip K.; Srivastava, A. K.

doi:10.1016/j.ceramint.2019.11.213

Cited by 24 publications

(2 citation statements)

References 59 publications

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“…For this reason, many efforts have been made to adapt the characteristics of these mixed oxides to each specific application, exploring various methods for their fine-tuning. In particular, it is possible to act on composition and cation charges (Grabowska, 2016;Thomas and Balakrishnan, 2020;Shen et al, 2021), crystal structure (Ikeda et al, 2016;Ishihara, 2017;Kaur and Singh, 2020;Mohammed et al, 2020;Kotomin et al, 2022), morphology (Neagu et al, 2013;Mohammed et al, 2020;Yu et al, 2020), oxygen vacancies (δ) and other defects (Eichel et al, 2013;Neagu et al, 2013;Bueno-López, 2015;Prakash and Jalan, 2019;Rojas-Cervantes and Castillejos, 2019;Bulemo and Kim, 2020;Ji et al, 2020;Monama et al, 2022;Mi et al, 2023;Souri and Salar Amoli, 2023) by different strategies in terms of doping the A-/B-sites, compositing and choosing proper preparation methods (Wu and Zhu, 2016;Taylor et al, 2017;Yang and Guo, 2018;Gainutdinov et al, 2019;Kaur and Singh, 2020;Walton, 2020;Xia et al, 2020;Su et al, 2021;Monama et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Sr0.85Ce0.15Fe0.67Co0.33-xCuxO3 perovskite oxides: effect of B-site copper codoping on the physicochemical, catalytic and antibacterial properties upon UV or thermal activation

Tummino,

Vineis,

Varesano

et al. 2023

Front. Environ. Eng.

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Perovskite-type compounds have found application in environmental remediation and in clean energy production, fundamental sectors for sustainable development. A challenge for these materials is the fine-tuning of their chemical composition and their chemical-physical characteristics, for example, microstructure, morphology and ability to form oxygen vacancies, through the introduction of dopant elements. In this work, we studied the effect of Cu doping at the B-site of a Ce, Co-doped strontium ferrate perovskite with chemical composition Sr0.85Ce0.15Fe0.67Co0.33O3-δ. Indeed, Sr0.85Ce0.15Fe0.67Co0.23Cu0.10O3-δ and Sr0.85Ce0.15Fe0.67Co0.13Cu0.20O3-δ powders, where the B-site was codoped with both cobalt and copper, were synthesised by solution combustion synthesis and characterised for their physical-chemical properties by a multi-analytical approach, to assess their behaviour when subjected to different activation methods. The two codoped perovskites were tested 1) as catalysts in the oxidation of soot after activation at high temperatures, 2) as antibacterial agents in ambient conditions or activated by both UV exposure and low-temperature excitation to induce the generation of reactive species. Results demonstrated that these compounds react differently to various stimuli and that the increasing amount of copper, together with the presence of segregated ceria phase, influenced the materials’ features and performances. The knowledge gained on the structure-properties relationships of these materials can inspire other research studies on perovskite oxides application as multifunctional materials for the benefit of the environment, society and economy.

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Section: Introductionmentioning

confidence: 99%

Sr0.85Ce0.15Fe0.67Co0.33-xCuxO3 perovskite oxides: effect of B-site copper codoping on the physicochemical, catalytic and antibacterial properties upon UV or thermal activation

Tummino,

Vineis,

Varesano

et al. 2023

Front. Environ. Eng.

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“…The characteristics of CCTO-based ceramics are also extremely sensitive to annealing conditions, the most important of which are temperature and duration [28,[32][33][34]. For instance, obtaining CCTO-based ceramics with high permittivity requires prolonged thermal treatment at 1080 • C, although temperatures above 1065 • C cause Cu 2+ reduction to Cu + , which, in turn, can induce large dielectric losses.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Lithium Doping on the Dielectric Properties of Solid Solutions LixCa(1−x)Cu3Ti4O12 (x = 0.01–0.1)

et al. 2023

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In this paper, LixCa(1−x)Cu3Ti4O12 (LCCTO) solid solutions were successfully synthesized. XRD diagrams showed that dopant acceptor Li+ cations, in a concentration range of x = 0.01–0.10, were successfully merged into CCTO structure. It was found that doping with low concentrations of lithium (x < 0.05) inhibited grain growth during annealing; however, for x > 0.05, the grain growth process resumed. Permittivity and dielectric losses of obtained LCCTO ceramics were analyzed by the means of impedance spectroscopy in a frequency range from 10−1 to 106 Hz. It was revealed that acceptor doping with lithium at an appropriate concentration of x = 0.05 allowed to obtain ceramics with a permittivity level of ε′ = 3 × 104 and low dielectric losses tanδ < 0.1 at 1 kHz. Further addition of lithium in a concentration range of x = 0.075–0.10 led to a sharp decline in permittivity and an increase in dielectric losses. It was discovered that lithium addition to CCTO ceramics drastically decreased grain boundary resistivity from 115 MΩ·cm to 5–40 MΩ·cm at x = 0.01–0.10. Using Havriliak–Negami equation, the relaxation times for grain dipoles and grain boundary dipoles were found to be ranging from 0.8 × 10−6 to 1.7 × 10−6 s and from 0.4 × 10−4 to 7.1 × 10−4 s, respectively. The developed materials can be used in the manufacture of Multilayer Ceramic Capacitors (MLCC) as a dielectric.

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Differences between La substitution and doping strategies in dielectric properties of CaCu3Ti4O12 ceramics with low loss

Zhang

Guo

et al. 2022

J Mater Sci: Mater Electron

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Phase structure evolution, crystal structure refinement, morphology, and electro-optical properties of heat-treated Ca0.9Ni0.1Cu2.9La0.1Ti4O12

Cited by 24 publications

References 59 publications

Sr0.85Ce0.15Fe0.67Co0.33-xCuxO3 perovskite oxides: effect of B-site copper codoping on the physicochemical, catalytic and antibacterial properties upon UV or thermal activation

Sr0.85Ce0.15Fe0.67Co0.33-xCuxO3 perovskite oxides: effect of B-site copper codoping on the physicochemical, catalytic and antibacterial properties upon UV or thermal activation

The Effect of Lithium Doping on the Dielectric Properties of Solid Solutions LixCa(1−x)Cu3Ti4O12 (x = 0.01–0.1)

Differences between La substitution and doping strategies in dielectric properties of CaCu3Ti4O12 ceramics with low loss

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