Superconducting Sr2-xAxCuO2F2+δ (A = Ca, Ba): Synthetic pathways and associated structural rearrangements

M. G. Francesconi; P. R. Slater; J. P. Hodges; C. Greaves; P. P. Edwards; M. Al-Mamouri; M. Slaski

doi:10.1006/jssc.1997.7564

Superconducting Sr_2-xA_xCuO₂F_2+δ (A = Ca, Ba): Synthetic pathways and associated structural rearrangements

M. G. Francesconi, P. R. Slater, J. P. Hodges, C. Greaves^*, P. P. Edwards, M. Al-Mamouri, M. Slaski

^*Corresponding author for this work

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

40 Citations (Scopus)

Abstract

The low-temperature fluorination of a range of insulating alkaline earth cuprates Sr_2-xA_xCuO₃ (A = Ca (0 ≤ x ≤ 2); A = Ba (0 ≤ x ≤ 0.6)) can result in superconducting oxide fluorides Sr_2-xA_xCuO₂F_2+δ. In contrast, conventional high-temperature solid-state reactions produce thermodynamically more stable mixtures of oxides and fluorides. Various soft-chemistry fluorination pathways (utilizing F₂ gas, NH₄F, MF₂ [M = Cu, Zn, Ni, Ag]) are compared with respect to their efficacy and mechanisms. Attention is also focused on the structural features of the mixed-oxide precursor and the final-oxide fluorides to highlight the remarkable structural rearrangements that occur during the low-temperature fluorination. The effects of fluorination of other Sr-Cu-O systems are used to identify the structural requirements of the precursor oxide in order to achieve such transformations.

Original language	English
Pages (from-to)	17-27
Number of pages	11
Journal	Journal of Solid State Chemistry
Volume	135
Issue number	1
DOIs	https://doi.org/10.1006/jssc.1997.7564
Publication status	Published - 1 Jan 1998

ASJC Scopus subject areas

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

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10.1006/jssc.1997.7564

Cite this

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title = "Superconducting Sr2-xAxCuO2F2+δ (A = Ca, Ba): Synthetic pathways and associated structural rearrangements",

abstract = "The low-temperature fluorination of a range of insulating alkaline earth cuprates Sr2-xAxCuO3 (A = Ca (0 ≤ x ≤ 2); A = Ba (0 ≤ x ≤ 0.6)) can result in superconducting oxide fluorides Sr2-xAxCuO2F2+δ. In contrast, conventional high-temperature solid-state reactions produce thermodynamically more stable mixtures of oxides and fluorides. Various soft-chemistry fluorination pathways (utilizing F2 gas, NH4F, MF2 [M = Cu, Zn, Ni, Ag]) are compared with respect to their efficacy and mechanisms. Attention is also focused on the structural features of the mixed-oxide precursor and the final-oxide fluorides to highlight the remarkable structural rearrangements that occur during the low-temperature fluorination. The effects of fluorination of other Sr-Cu-O systems are used to identify the structural requirements of the precursor oxide in order to achieve such transformations.",

author = "Francesconi, {M. G.} and Slater, {P. R.} and Hodges, {J. P.} and C. Greaves and Edwards, {P. P.} and M. Al-Mamouri and M. Slaski",

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AU - Francesconi, M. G.

AU - Slater, P. R.

AU - Hodges, J. P.

AU - Greaves, C.

AU - Edwards, P. P.

AU - Al-Mamouri, M.

AU - Slaski, M.

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AB - The low-temperature fluorination of a range of insulating alkaline earth cuprates Sr2-xAxCuO3 (A = Ca (0 ≤ x ≤ 2); A = Ba (0 ≤ x ≤ 0.6)) can result in superconducting oxide fluorides Sr2-xAxCuO2F2+δ. In contrast, conventional high-temperature solid-state reactions produce thermodynamically more stable mixtures of oxides and fluorides. Various soft-chemistry fluorination pathways (utilizing F2 gas, NH4F, MF2 [M = Cu, Zn, Ni, Ag]) are compared with respect to their efficacy and mechanisms. Attention is also focused on the structural features of the mixed-oxide precursor and the final-oxide fluorides to highlight the remarkable structural rearrangements that occur during the low-temperature fluorination. The effects of fluorination of other Sr-Cu-O systems are used to identify the structural requirements of the precursor oxide in order to achieve such transformations.

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