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

Kawrani, Sara; Boulos, Madona; Cornu, David; Bechelany, Mikhaël

doi:10.1002/open.201900133

Cited by 44 publications

(21 citation statements)

References 123 publications

(319 reference statements)

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“…The final product of decomposition is CuO. The magnetic measurements of the studied material indicate its very high structural and chemical quality and yield the antiferromagnetic configuration of Cu(II) ions, thus opening wide prospects of utilization in various fields as, e.g., biosensors, capacitors, transistors, or in data storage systems [ 46 , 47 , 48 , 49 ].…”

Section: Discussionmentioning

confidence: 99%

Structural, Spectroscopic, Thermal, and Magnetic Properties of a New Dinuclear Copper Coordination Compound with Tiglic Acid

et al. 2021

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The first coordination compound of copper and tiglic acid named tetrakis(μ-tiglato)bis(tiglic acid)dicopper(II) was synthesized and crystallized from water solution. Its structure was determined and analyzed based on X-ray diffraction measurement. The paddle-wheel coordination system of the investigated compound was compared with other similar copper structures known in the literature. The Hirshfeld analysis was used for the detailed analysis of intermolecular interaction. The new compound was also characterized in terms of infrared absorption, thermal, and magnetic properties. The antiferromagnetic coupling of copper ions was found.

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Section: Discussionmentioning

confidence: 99%

Structural, Spectroscopic, Thermal, and Magnetic Properties of a New Dinuclear Copper Coordination Compound with Tiglic Acid

et al. 2021

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“…Perovskite-structured titanates are the leading dielectric material systems for a plethora of electronic component applications owing to their superior dielectric properties, large breakdown strengths, photochemical and electrochemical reactivity, high energy storage, and discharge power density. [1][2][3][4] Capacitive pressure and strain sensors, actuators, and energy storage devices require materials possessing large dielectric constants (>10 4 ) with low dielectric loss (<0.1) accompanied by good thermal stability. 5 Calcium copper titanate (CaCu 3 Ti 4 O 12 )(CCTO), a well-known electroceramic, is an A-site ordered cubic perovskite, which exhibits a large dielectric constant (ε 0 ) ∼ 10 5 outranking its isostructural ferroelectric counterparts.…”

Section: Introductionmentioning

confidence: 99%

Superior dielectric and varistor properties of ZnO or SnO2 diffused calcium copper titanate ceramics

Dhavala

Muthukumar

Sai

et al. 2023

Journal of Applied Physics

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Sub-micrometer-sized (0.33 μm) polycrystalline powders of calcium copper titanate (CCTO) were synthesized via the solgel method. Compacted calcined powders were sintered at 900 °C/2h to obtain porous (<80% density) pellets. Subsequently, ZnO or SnO2 pastes (∼10 μm grain size) were smeared on either side of the pellets and sintered at 1100 °C/15 h, which yielded dense (>95% density) ceramics. X-ray structural investigations revealed the presence of ZnO or SnO2 traces in the bulk of the CCTO ceramics. Scanning electron microscopy and energy dispersive spectroscopic studies confirmed the diffusion and the segregation of these oxides at the grain boundaries. The dielectric and varistor properties of the ZnO or SnO2 diffused samples were found to be superior to that of pristine CCTO ceramics. For instance, the dielectric constant (ɛ′) of ZnO diffused ceramics exhibited a value as high as 2.4 × 104 (1 kHz, at room temperature) and a dielectric loss (D) of 0.059. Similarly, SnO2 diffused ceramics exhibited a dielectric constant of 2.7 × 104 (1 kHz, at room temperature) associated with a dielectric loss of 0.047. The figure of merit of varistor performance, i.e., nonlinear coefficient ( α = 10.6), of the SnO2 diffused sample is significantly higher than that of ZnO diffused ( α = 7.4) and pristine CCTO ( α = 4.5) ceramics. The dielectric data obtained for both the pristine and ZnO or SnO2 diffused ceramics were rationalized by invoking Cole–Cole analysis. The thermal activation energy was estimated from the temperature-dependent dielectric data besides current (I)–voltage (V) characteristics. Equivalent circuit modeling of the Nyquist plots demonstrated that the inclusion of ZnO and SnO2 layers in CCTO ceramics remarkably improved the grain boundary resistance ( Rgb) by 5-fold and 20-fold, respectively, which resulted in making CCTO a better dielectric. This methodology of fabricating ceramics via interfacial engineering could pave the way for obtaining superior CCTO ceramics associated with exotic functional properties.

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“…Amongst 3d transition metals, copper is also an essential element due to its natural abundance, cost‐effective and more sustainable than precious transition metal catalysts [1] . Copper is an essential ingredient present in bio‐catalysts or enzymes and it catalyzes several biological processes [2] .…”

Section: Introductionmentioning

confidence: 99%

Recent Advancement in the Copper Mediated Synthesis of Heterocyclic Amides as Important Pharmaceutical and Agrochemicals

Chandra

2021

ChemistrySelect

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Copper with variable oxidation states, Earth abundance was used as a tunable and multifunctional catalyst promoting organic transformations. Copper‐based catalytic materials have been effectively utilized in bioorganic chemistry, material science, and natural products synthesis. Several organic transformations involving cycloadditions, cyclizations, cross‐couplings, and condensations in one‐pot assist in the formation of multiple bonds like C−C/C−O bonds, C−C/C−N bonds, and C−N/C−S bonds. Copper has recently been explored as efficient catalytic material for the synthesis of heterocyclic amides. Heterocyclic amides are essential organic compounds are quite prevelent in the pharmaceuticals, fine chemicals and natural products. The heterocyclic amides are the key components of multivarious ace drugs and bio‐molecules like peptides and proteins, and several natural products. Therefore, heterocyclic amides are of much significance, and research focusing on the facile methods is of much interest to contemporary synthetic chemists. Different techniques have been developed using copper‐based catalysts for the synthesis of heterocyclic amdes. These heterocyclic amides are prepared by the reaction of C(sp3)−H, C(sp2)−H, C(sp)−H bonds, aldehydes, ketones, carboxylic acid, carboxylic acid‐based surrogates, and amine surrogates. N‐alkyation of amides with multifarious substrates has been the extensively investigated for the synthesis of heterocyclic amides. Finally, multicomponent domino reactions have also been investigated for the synthesis of heterocycic amides. The present review summarises various synthetic techniques for the copper catalyzed heterocyclic amides synthesis.

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

Cited by 44 publications

References 123 publications

Structural, Spectroscopic, Thermal, and Magnetic Properties of a New Dinuclear Copper Coordination Compound with Tiglic Acid

Structural, Spectroscopic, Thermal, and Magnetic Properties of a New Dinuclear Copper Coordination Compound with Tiglic Acid

Superior dielectric and varistor properties of ZnO or SnO2 diffused calcium copper titanate ceramics

Recent Advancement in the Copper Mediated Synthesis of Heterocyclic Amides as Important Pharmaceutical and Agrochemicals

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