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

doi:10.1039/JM9950501931

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

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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) 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 language	English
Pages (from-to)	1931-1933
Number of pages	3
Journal	Journal of Materials Chemistry
Volume	5
Issue number	11
DOIs	https://doi.org/10.1039/JM9950501931
Publication status	Published - 1 Dec 1995

Keywords

strontium oxide-copper binary phase diagram
oxygen pressures
oxygen stoichiometry
copper valence
Vernier structure

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10.1039/JM9950501931

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@article{32fa3f38b57b4664aa282b3dbddfed08,

title = "Synthesis of the new high pressure vernier phase Sr0.74CuO 2",

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.",

keywords = "strontium oxide-copper binary phase diagram, oxygen pressures, oxygen stoichiometry, copper valence, Vernier structure",

author = "Sastry, {P. V.P.S.S.} and Robertson, {Alastair D.} and Lachowski, {Eric E.} and Alison Coats and West, {Anthony R.}",

year = "1995",

month = dec,

day = "1",

doi = "10.1039/JM9950501931",

language = "English",

volume = "5",

pages = "1931--1933",

journal = "Journal of Materials Chemistry",

issn = "0959-9428",

publisher = "Royal Society of Chemistry",

number = "11",

}

TY - JOUR

T1 - Synthesis of the new high pressure vernier phase Sr0.74CuO 2

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

AU - Robertson, Alastair D.

AU - Lachowski, Eric E.

AU - Coats, Alison

AU - West, Anthony R.

PY - 1995/12/1

Y1 - 1995/12/1

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.

KW - strontium oxide-copper binary phase diagram

KW - oxygen pressures

KW - oxygen stoichiometry

KW - copper valence

KW - Vernier structure

U2 - 10.1039/JM9950501931

DO - 10.1039/JM9950501931

M3 - Article

VL - 5

SP - 1931

EP - 1933

JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

SN - 0959-9428

IS - 11

ER -