Synthesis of the new high pressure vernier phase Sr0.74CuO 2

P. V.P.S.S. Sastry*, Alastair D. Robertson, Eric E. Lachowski, Alison Coats, Anthony R. West

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The strontium oxide-copper oxide binary phase diagram has been reinvestigated under oxygen pressures of up to 600 bar, in the temperature range 600-850 °C. A new, high-pressure phase, Sr0.74CuO2, has been isolated and characterised. The oxygen stoichiometry, confirmed by thermogravimetry, gives an average formal copper valence of ca. 2.5. X-Ray and electron diffraction analyses suggest that Sr0.74CuO2 has a Vernier structure incommensurate in b. The subcells are body-centred orthorhombic: aI=6.8182(12) Å, bI, = 3.7113(7) Å, cI=11.0203(17) Å, and face-centred orthorhombic: aII=6.8182(12) Å, bII = 2.7290(3) Å, c II = 11.0203(17) Å. The subcells combine into a coincidence (super)cell with b = 92.79(1) Å, which is 25bI and 34b II. The structure of one of the subcells appears to be related to that of Ca0.82CuO2 and NaCuO2. Sr 0.74CuO2 is non-superconducting, at least above 4 K.

Original languageEnglish
Pages (from-to)1931-1933
Number of pages3
JournalJournal of Materials Chemistry
Volume5
Issue number11
DOIs
Publication statusPublished - 1 Dec 1995
Externally publishedYes

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Oxygen
Strontium
Copper oxides
Electron diffraction
Stoichiometry
Phase diagrams
Thermogravimetric analysis
Copper
X ray diffraction
Oxides
Temperature

Cite this

Sastry, P. V. P. S. S., Robertson, A. D., Lachowski, E. E., Coats, A., & West, A. R. (1995). Synthesis of the new high pressure vernier phase Sr0.74CuO 2. Journal of Materials Chemistry, 5(11), 1931-1933. https://doi.org/10.1039/JM9950501931
Sastry, P. V.P.S.S. ; Robertson, Alastair D. ; Lachowski, Eric E. ; Coats, Alison ; West, Anthony R. / Synthesis of the new high pressure vernier phase Sr0.74CuO 2. In: Journal of Materials Chemistry. 1995 ; Vol. 5, No. 11. pp. 1931-1933.
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abstract = "The strontium oxide-copper oxide binary phase diagram has been reinvestigated under oxygen pressures of up to 600 bar, in the temperature range 600-850 °C. A new, high-pressure phase, Sr0.74CuO2, has been isolated and characterised. The oxygen stoichiometry, confirmed by thermogravimetry, gives an average formal copper valence of ca. 2.5. X-Ray and electron diffraction analyses suggest that Sr0.74CuO2 has a Vernier structure incommensurate in b. The subcells are body-centred orthorhombic: aI=6.8182(12) {\AA}, bI, = 3.7113(7) {\AA}, cI=11.0203(17) {\AA}, and face-centred orthorhombic: aII=6.8182(12) {\AA}, bII = 2.7290(3) {\AA}, c II = 11.0203(17) {\AA}. The subcells combine into a coincidence (super)cell with b = 92.79(1) {\AA}, which is 25bI and 34b II. The structure of one of the subcells appears to be related to that of Ca0.82CuO2 and NaCuO2. Sr 0.74CuO2 is non-superconducting, at least above 4 K.",
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Synthesis of the new high pressure vernier phase Sr0.74CuO 2. / Sastry, P. V.P.S.S.; Robertson, Alastair D.; Lachowski, Eric E.; Coats, Alison; West, Anthony R.

In: Journal of Materials Chemistry, Vol. 5, No. 11, 01.12.1995, p. 1931-1933.

Research output: Contribution to journalArticle

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AU - Sastry, P. V.P.S.S.

AU - Robertson, Alastair D.

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AU - West, Anthony R.

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N2 - The strontium oxide-copper oxide binary phase diagram has been reinvestigated under oxygen pressures of up to 600 bar, in the temperature range 600-850 °C. A new, high-pressure phase, Sr0.74CuO2, has been isolated and characterised. The oxygen stoichiometry, confirmed by thermogravimetry, gives an average formal copper valence of ca. 2.5. X-Ray and electron diffraction analyses suggest that Sr0.74CuO2 has a Vernier structure incommensurate in b. The subcells are body-centred orthorhombic: aI=6.8182(12) Å, bI, = 3.7113(7) Å, cI=11.0203(17) Å, and face-centred orthorhombic: aII=6.8182(12) Å, bII = 2.7290(3) Å, c II = 11.0203(17) Å. The subcells combine into a coincidence (super)cell with b = 92.79(1) Å, which is 25bI and 34b II. The structure of one of the subcells appears to be related to that of Ca0.82CuO2 and NaCuO2. Sr 0.74CuO2 is non-superconducting, at least above 4 K.

AB - The strontium oxide-copper oxide binary phase diagram has been reinvestigated under oxygen pressures of up to 600 bar, in the temperature range 600-850 °C. A new, high-pressure phase, Sr0.74CuO2, has been isolated and characterised. The oxygen stoichiometry, confirmed by thermogravimetry, gives an average formal copper valence of ca. 2.5. X-Ray and electron diffraction analyses suggest that Sr0.74CuO2 has a Vernier structure incommensurate in b. The subcells are body-centred orthorhombic: aI=6.8182(12) Å, bI, = 3.7113(7) Å, cI=11.0203(17) Å, and face-centred orthorhombic: aII=6.8182(12) Å, bII = 2.7290(3) Å, c II = 11.0203(17) Å. The subcells combine into a coincidence (super)cell with b = 92.79(1) Å, which is 25bI and 34b II. The structure of one of the subcells appears to be related to that of Ca0.82CuO2 and NaCuO2. Sr 0.74CuO2 is non-superconducting, at least above 4 K.

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