Tuning the optical and dielectric properties of calcium copper titanate CaxCu3−xTi4O12 nanopowders

Turky, Ali Omar; Rashad, M.M.; Zaki, Zaki Ismail; Ibrahim, Ibrahim Ahmed; Bechelany, Mikhaël

doi:10.1039/c4ra15222k

Cited by 34 publications

(16 citation statements)

References 33 publications

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“…Turky et al [40] demonstrated that without any dopant, only by controlling the chemistry and engineering, the interfacial regions at the grain boundaries, the dielectric loss can be suppressed remarkably while retaining the giant dielectric constant. 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 Finally, chung et al [41] prepared pellets sintered in a tubetype furnace at 1100°C in air for 3 to 20 h and removed immediately to room temperature without any furnace-cooling.…”

Section: Synthesis Methods Precursors ɛ' Tan δ Referencesmentioning

confidence: 99%

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From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

et al. 2019

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Investigations focusing on electrical energy storage capacitors especially the dielectric ceramic capacitors for high energy storage density are attracting more and more attention in the recent years. Ceramic capacitors possess a faster charge‐discharge rate and improved mechanical and thermal properties compared with other energy storage devices such as batteries. The challenge is to obtain ceramic capacitors with outstanding mechanical, thermal and storage properties over large temperature and frequencies ranges. ABO 3 as a type of perovskites showed a strong piezoelectric, dielectric, pyroelectric, and electro‐optic properties useful as energy storage and environmental devices. CaCu 3 Ti 4 O 12 (CCTO) perovskite with cubic lattice (Im3 symmetry) was discovered to have a colossal dielectric constant (10 4 ) that is stable over a wide range of frequencies (10 Hz–1 MHz) and temperature independence (100–300 K). The origin of this high dielectric constant is not fully established, specially because it is the same for single crystal and thin films. In this review, the history of CCTO will be introduced. The synthesis and the sintering approaches, the dopant elements used as well as the applications of CCTO will be reported. In addition to dielectrical properties useful to energy storage devices; CCTO could serve as photocatalytic materials with a very good performance in visible light.

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Section: Synthesis Methods Precursors ɛ' Tan δ Referencesmentioning

confidence: 99%

“…Turky et al . demonstrated that without any dopant, only by controlling the chemistry and engineering, the interfacial regions at the grain boundaries, the dielectric loss can be suppressed remarkably while retaining the giant dielectric constant.…”

Section: Sintering and Dielectric Propertiesmentioning

confidence: 99%

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

et al. 2019

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“…Along with the development of novel complex perovskite oxide materials, a large number of synthetic strategies have recently been developed to produce CTO materials of different sizes and morphologies [8][9][10][11][12][13][14][15]. In this context, it is well known that the polymeric precursor method is a simple, clean, and efficient approach to fabricate complex functional materials.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, it is well known that the polymeric precursor method is a simple, clean, and efficient approach to fabricate complex functional materials. It also offers excellent chemical homogeneity and precise stoichiometric control during heat treatments at relatively low temperatures [9,15,16]. Hence, this synthetic strategy substantially reduces the presence of segregated phases and does not require long annealing periods compared with other synthetic methods [9,15,16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Cu-doping on the structural and optical properties of CaTiO3 powders

Oliveira

Moura

Porta

et al. 2016

Materials Research Bulletin

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A B S T R A C THere, we report on the effect of chemical substitution on the structural and optical properties of Cudoped CaTiO 3 (CTO) polycrystalline powders synthesized by the polymeric precursor method. Our findings are discussed based on the structural order-disorder effects originating from the modification of the Ca 1Àx Cu x TiO 3 microcrystal matrix. These results may elucidate the compositional modulation and methods of controlling the structural design, as well as reveal the changes in the optical behavior of this system at an atomic level.

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“…The physical and chemical properties of CCTO materials can be influenced by the Ca/Cu ratio [12][13][14][15][16]. Consequently, the dielectric permittivity, resistivity, and density of CCTO materials are closely related to the segregation of CuO at the grain boundaries [12,13].…”

Section: Introductionmentioning

confidence: 99%

Optical and gas-sensing properties, and electronic structure of the mixed-phase CaCu 3 Ti 4 O 12 /CaTiO 3 composites

Oliveira

Ramírez

Ponce

et al. 2017

Materials Research Bulletin

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Optical and gas-sensing properties, and electronic structure of the mixed-phase CaCu3Ti4O12/CaTiO3 composites, Materials Research Bulletinhttp://dx. Graphical abstract A) B)Highlights  CCTO/CTO composites were synthesized by a solid-state reaction using various milling durations; These composites have a broad PL emission band located at 450 nm; CCTO/CTO material was deposited onto an alumina substrate using a screen-printing technique, and hence, could be structured for gas-sensing applications;  Our theoretical findings may further elucidate the electronic structure associated with the interfacial band alignment (type I-straddling gap); Combined experimental and theoretical investigations were conducted on the electronic structure, as well as the optical and gas-sensing properties of mixedphase CaCu3Ti4O12/CaTiO3 (CCTO/CTO) composites, which were synthesized by a solid-state reaction using various milling durations. Our results revealed that these CCTO/CTO composites have a broad photoluminescence (PL) emission band located at 450 nm, which is strongly influenced by the milling process duration. Scanning electron microscopy images confirmed that the use of longer milling durations favored the formation of pores and increased the active surface area of the CCTO/CTO thick films. The thick films were prepared using the screenprinting technique, and hence, could be structured for gas-sensing applications. Our theoretical findings may further elucidate the electronic structure associated with the interfacial band alignment (type I-straddling gap) of the CCTO/CTO composite systems.

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Tuning the optical and dielectric properties of calcium copper titanate Ca_xCu_3−xTi₄O₁₂ nanopowders

Abstract: The present study acts as a simple and effective way in the synthesis and characterization of CCTO with tunable optical and dielectrical properties.

Cited by 34 publications

References 33 publications

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

Influence of Cu-doping on the structural and optical properties of CaTiO3 powders

Optical and gas-sensing properties, and electronic structure of the mixed-phase CaCu 3 Ti 4 O 12 /CaTiO 3 composites

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