Synthesis, structural characterization, and physical properties of the new transition metal oxyselenide Ce2O2ZnSe2

Chris M. Ainsworth; Chun Hai Wang; Matthew G. Tucker; John S.O. Evans

doi:10.1021/ic502551n

Synthesis, structural characterization, and physical properties of the new transition metal oxyselenide Ce₂O₂ZnSe₂

Chris M. Ainsworth, Chun Hai Wang, Matthew G. Tucker, John S.O. Evans

Research output: Contribution to journal › Article › peer-review

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Abstract

The quaternary transition metal oxyselenide Ce₂O₂ZnSe₂ has been shown to adopt a ZrCuSiAs-related structure with Zn²⁺ cations in a new ordered arrangement within [ZnSe₂]^2- layers. The color of the compound changes as a function of cell volume, which can vary by ∼0.4% under different synthetic conditions. At the highest, intermediate, and lowest cell volumes, the color is yellow-ochre, brown, and black, respectively. The decreased volume is attributed to oxidation of Ce from 3+ to 4+, the extent of which can be controlled by synthetic conditions. Ce₂O₂ZnSe₂ is a semiconductor at all cell volumes with experimental optical band gaps of 2.2, 1.4, and 1.3 eV for high, intermediate, and low cell volume samples, respectively. SQUID measurements show Ce₂O₂ZnSe₂ to be paramagnetic from 2 to 300 K with a negative Weiss temperature of θ = -10 K, suggesting weak antiferromagnetic interactions.

Original language	English
Pages (from-to)	1563-1571
Number of pages	9
Journal	Inorganic Chemistry
Volume	54
Issue number	4
DOIs	https://doi.org/10.1021/ic502551n
State	Published - Feb 16 2015
Externally published	Yes

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title = "Synthesis, structural characterization, and physical properties of the new transition metal oxyselenide Ce2O2ZnSe2",

abstract = "The quaternary transition metal oxyselenide Ce2O2ZnSe2 has been shown to adopt a ZrCuSiAs-related structure with Zn2+ cations in a new ordered arrangement within [ZnSe2]2- layers. The color of the compound changes as a function of cell volume, which can vary by ∼0.4% under different synthetic conditions. At the highest, intermediate, and lowest cell volumes, the color is yellow-ochre, brown, and black, respectively. The decreased volume is attributed to oxidation of Ce from 3+ to 4+, the extent of which can be controlled by synthetic conditions. Ce2O2ZnSe2 is a semiconductor at all cell volumes with experimental optical band gaps of 2.2, 1.4, and 1.3 eV for high, intermediate, and low cell volume samples, respectively. SQUID measurements show Ce2O2ZnSe2 to be paramagnetic from 2 to 300 K with a negative Weiss temperature of θ = -10 K, suggesting weak antiferromagnetic interactions.",

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AU - Ainsworth, Chris M.

AU - Wang, Chun Hai

AU - Tucker, Matthew G.

AU - Evans, John S.O.

PY - 2015/2/16

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N2 - The quaternary transition metal oxyselenide Ce2O2ZnSe2 has been shown to adopt a ZrCuSiAs-related structure with Zn2+ cations in a new ordered arrangement within [ZnSe2]2- layers. The color of the compound changes as a function of cell volume, which can vary by ∼0.4% under different synthetic conditions. At the highest, intermediate, and lowest cell volumes, the color is yellow-ochre, brown, and black, respectively. The decreased volume is attributed to oxidation of Ce from 3+ to 4+, the extent of which can be controlled by synthetic conditions. Ce2O2ZnSe2 is a semiconductor at all cell volumes with experimental optical band gaps of 2.2, 1.4, and 1.3 eV for high, intermediate, and low cell volume samples, respectively. SQUID measurements show Ce2O2ZnSe2 to be paramagnetic from 2 to 300 K with a negative Weiss temperature of θ = -10 K, suggesting weak antiferromagnetic interactions.

AB - The quaternary transition metal oxyselenide Ce2O2ZnSe2 has been shown to adopt a ZrCuSiAs-related structure with Zn2+ cations in a new ordered arrangement within [ZnSe2]2- layers. The color of the compound changes as a function of cell volume, which can vary by ∼0.4% under different synthetic conditions. At the highest, intermediate, and lowest cell volumes, the color is yellow-ochre, brown, and black, respectively. The decreased volume is attributed to oxidation of Ce from 3+ to 4+, the extent of which can be controlled by synthetic conditions. Ce2O2ZnSe2 is a semiconductor at all cell volumes with experimental optical band gaps of 2.2, 1.4, and 1.3 eV for high, intermediate, and low cell volume samples, respectively. SQUID measurements show Ce2O2ZnSe2 to be paramagnetic from 2 to 300 K with a negative Weiss temperature of θ = -10 K, suggesting weak antiferromagnetic interactions.

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Synthesis, structural characterization, and physical properties of the new transition metal oxyselenide Ce₂O₂ZnSe₂

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