Spontaneous ferromagnetism at room temperature in oxygen-rich dicalcium cuprate Ca2CuO3+δ

Abdelgadir, M.A.; Burrows, Richard S.; McDaniel, Darl H.

doi:10.1557/jmr.1996.0227

Cited by 8 publications

(1 citation statement)

References 13 publications

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“…Overall, considering the potential benefits of CaO and CuO additives in CaSO 4 as mentioned above as well as the wide application of these two components in the new integrated process with CLC and calcium looping, , it is more meaningful to add the CaO–CuO combined composite into CaSO 4 to efficiently improve the reaction performance of the CaSO 4 OC and simultaneously to directionally fix gaseous SO 2 released. Meanwhile, among all of the CaO–CuO candidates available, Ca 2 CuO 3 is reported as one of the most commonly encountered cuprates with a special corner-sharing chain crystal structure, which is stable at the operational temperature range up to 1000 °C from either the phase equilibrium or experimental verification and, thus, holds great promise to use in CLC.…”

Section: Introductionmentioning

confidence: 99%

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Wang

Liang

et al. 2020

Energy Fuels

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Resource utilization of the disposed CaSO 4 waste as an oxygen carrier (OC) in chemical looping combustion (CLC) is of great meaning as a result of its attractive strengths, such as easy availability, low cost, large oxygen capacity, and avoidance of potential environmental harm. In this research, a novel mixed OC of CaSO 4 doped with Ca 2 CuO 3 was first reported and produced using a combined template preparation method. Its reaction behavior with a typical lignite designated as YN was studied, which indicated that doped Ca 2 CuO 3 well enhanced the reactivity of CaSO 4 with YN coal. The CO 2 yield as formed was greatly accelerated, while SO 2 evolved from the CaSO 4 side reactions could be effectively controlled, as expected. Furthermore, the potential oxygen transfer mechanism during the CaSO 4 −Ca 2 CuO 3 mixed OC reaction with YN coal was revealed, wherein elemental Cu derived from reduced Ca 2 CuO 3 could regain lattice oxygen inherent in unreacted CaSO 4 via its melting interface. In situ reoxidized CuO would decompose and emit O 2 for direct combustion of residual char of YN. Then, migration and redistribution of the sulfur species were completely investigated. Added Ca 2 CuO 3 was found to be reduced to CaO and elemental Cu during its reaction with YN, both of which were able to directionally fix gaseous sulfur evolved from CaSO 4 to form CaS and Cu 2 S, respectively. Thus, the gaseous sulfur retention capacity of this mixed OC was much improved. In addition, the prepared CaSO 4 −Ca 2 CuO 3 mixed OC demonstrated good regeneration capacity and strong sintering resistance as well. Overall, the novel CaSO 4 −Ca 2 CuO 3 mixed OC as reported possessed good reactivity and directional fixation of gaseous sulfur, which benefited from simultaneous carbon capture and in situ desulfurization in CLC, and as such is quite attractive for future application.

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Section: Introductionmentioning

confidence: 99%

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Wang

Liang

et al. 2020

Energy Fuels

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A “Single‐Sample Concept” (SSC): A New Approach to the Combinatorial Chemistry of Inorganic Materials

Hulliger

Awan

2004

Chemistry A European J

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Combinatorial estimations show that, within an unreacted ceramic sample prepared by mixing N different starting materials MxOy with average particle size approximately 1 microm, there are about 10(12) grains per cubic centimeter, sufficient for local reactions to occur that may produce a larger number of product oxides than presently accessible by 2D plate techniques. The "single-sample concept" (SSC) is proposed for performing property-directed syntheses for the preparation of ferri-/ferromagnetic or superconducting compounds. Because of the magnetic properties of the products, libraries of product grains can be sorted by means of magnetic separation techniques. For materials with a large magnetization, the separation efficiency is so high that traces of products can be isolated. The SSC concept was tested experimentally to prepare Fe-based oxides (N=17, 24, 30). The large yields (<75 wt %, N=17) of product grains agree with the literature data, which indicate that 3d metal magnetic oxide phases (Tc>300 K) are most probably Fe oxides. In combination with magnetic separation techniques, SSC seems particularly adapted for exploring the solid-state chemistry of metallic lead elements that form ferri-/ferromagnetic or superconducting oxide phases difficult to detect systematically within the large phase space of theoretically existing compounds.

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Evaluation of Ca2CuO3 as an oxygen carrier material

et al. 2021

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Spontaneous ferromagnetism at room temperature in oxygen-rich dicalcium cuprate Ca₂CuO_3+δ

Cited by 8 publications

References 13 publications

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

A “Single‐Sample Concept” (SSC): A New Approach to the Combinatorial Chemistry of Inorganic Materials

Evaluation of Ca2CuO3 as an oxygen carrier material

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Spontaneous ferromagnetism at room temperature in oxygen-rich dicalcium cuprate Ca2CuO3+δ

Cited by 8 publications

References 13 publications

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO4–Ca2CuO3 Mixed Oxygen Carrier

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO4–Ca2CuO3 Mixed Oxygen Carrier

A “Single‐Sample Concept” (SSC): A New Approach to the Combinatorial Chemistry of Inorganic Materials

Evaluation of Ca2CuO3 as an oxygen carrier material

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Product

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Spontaneous ferromagnetism at room temperature in oxygen-rich dicalcium cuprate Ca₂CuO_3+δ

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier