Order-disorder transition in (Cu0.5Cr0.5)Sr2CuOx under high-pressure and high-temperature conditions

T. Drezen; S. M. Loureiro; T. Nagai; T. Asaka; Y. Matsui; A. Yamazaki; E. Takayama-Muromachi

doi:10.1006/jssc.2001.9334

Order-disorder transition in (Cu_0.5Cr_0.5)Sr₂CuO_x under high-pressure and high-temperature conditions

T. Drezen, S. M. Loureiro, T. Nagai, T. Asaka, Y. Matsui, A. Yamazaki, E. Takayama-Muromachi^*

^*Corresponding author for this work

School of Creative Science and Engineering

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

1 Citation (Scopus)

Abstract

The (Cu_0.5Cr_0.5)Sr₂CuO_x phase is the first member of the (Cu_0.5Cr_0.5)Sr₂Ca_n-1Cu _nO_2n+3 homologous series, having a layered structure with a single CuO₂ plane. Numerous samples of this system were prepared under high-pressure/high-temperature conditions while varying the x value. The phases crystallize with tetragonal symmetry when the samples are quenched to room temperature, while they show orthorhombic symmetry when slow cooled (with the exception of the x = 5.0 sample). Transmission electron microscopic data collected on several samples have allowed us to suggest that the origin of the orthorhombic distortion in the slowly cooled phases lies in the ordered arrangement of copper, chromium, and oxygen atoms in the (Cu_0.5Cr_0.5) plane. We have also concluded on the absence of superconductivity in the (Cu, Cr)-1201 phases.

Original language	English
Pages (from-to)	348-354
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	161
Issue number	2
DOIs	https://doi.org/10.1006/jssc.2001.9334
Publication status	Published - 2001 Nov 1

Keywords

(Cu, Cr)-1201
HRTEM
High-pressure synthesis
Order disorder transition
X-ray powder diffraction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1006/jssc.2001.9334

Cite this

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title = "Order-disorder transition in (Cu0.5Cr0.5)Sr2CuOx under high-pressure and high-temperature conditions",

abstract = "The (Cu0.5Cr0.5)Sr2CuOx phase is the first member of the (Cu0.5Cr0.5)Sr2Can-1Cu nO2n+3 homologous series, having a layered structure with a single CuO2 plane. Numerous samples of this system were prepared under high-pressure/high-temperature conditions while varying the x value. The phases crystallize with tetragonal symmetry when the samples are quenched to room temperature, while they show orthorhombic symmetry when slow cooled (with the exception of the x = 5.0 sample). Transmission electron microscopic data collected on several samples have allowed us to suggest that the origin of the orthorhombic distortion in the slowly cooled phases lies in the ordered arrangement of copper, chromium, and oxygen atoms in the (Cu0.5Cr0.5) plane. We have also concluded on the absence of superconductivity in the (Cu, Cr)-1201 phases.",

keywords = "(Cu, Cr)-1201, HRTEM, High-pressure synthesis, Order disorder transition, X-ray powder diffraction",

author = "T. Drezen and Loureiro, {S. M.} and T. Nagai and T. Asaka and Y. Matsui and A. Yamazaki and E. Takayama-Muromachi",

note = "Funding Information: The author greatly acknowledges M. Akaishi and S. Yamaoka for their helpful suggestions on high-pressure synthesis. This work was supported by the Multi-Core Project and Special Coordination Funds of the Science and Technology Agency of the Japanese Government.",

year = "2001",

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doi = "10.1006/jssc.2001.9334",

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T1 - Order-disorder transition in (Cu0.5Cr0.5)Sr2CuOx under high-pressure and high-temperature conditions

AU - Drezen, T.

AU - Loureiro, S. M.

AU - Nagai, T.

AU - Asaka, T.

AU - Matsui, Y.

AU - Yamazaki, A.

AU - Takayama-Muromachi, E.

N1 - Funding Information: The author greatly acknowledges M. Akaishi and S. Yamaoka for their helpful suggestions on high-pressure synthesis. This work was supported by the Multi-Core Project and Special Coordination Funds of the Science and Technology Agency of the Japanese Government.

PY - 2001/11/1

Y1 - 2001/11/1

N2 - The (Cu0.5Cr0.5)Sr2CuOx phase is the first member of the (Cu0.5Cr0.5)Sr2Can-1Cu nO2n+3 homologous series, having a layered structure with a single CuO2 plane. Numerous samples of this system were prepared under high-pressure/high-temperature conditions while varying the x value. The phases crystallize with tetragonal symmetry when the samples are quenched to room temperature, while they show orthorhombic symmetry when slow cooled (with the exception of the x = 5.0 sample). Transmission electron microscopic data collected on several samples have allowed us to suggest that the origin of the orthorhombic distortion in the slowly cooled phases lies in the ordered arrangement of copper, chromium, and oxygen atoms in the (Cu0.5Cr0.5) plane. We have also concluded on the absence of superconductivity in the (Cu, Cr)-1201 phases.

AB - The (Cu0.5Cr0.5)Sr2CuOx phase is the first member of the (Cu0.5Cr0.5)Sr2Can-1Cu nO2n+3 homologous series, having a layered structure with a single CuO2 plane. Numerous samples of this system were prepared under high-pressure/high-temperature conditions while varying the x value. The phases crystallize with tetragonal symmetry when the samples are quenched to room temperature, while they show orthorhombic symmetry when slow cooled (with the exception of the x = 5.0 sample). Transmission electron microscopic data collected on several samples have allowed us to suggest that the origin of the orthorhombic distortion in the slowly cooled phases lies in the ordered arrangement of copper, chromium, and oxygen atoms in the (Cu0.5Cr0.5) plane. We have also concluded on the absence of superconductivity in the (Cu, Cr)-1201 phases.

KW - (Cu, Cr)-1201

KW - HRTEM

KW - High-pressure synthesis

KW - Order disorder transition

KW - X-ray powder diffraction

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