Stabilization of Strontium Analogues of Barium Yttrium Cuprate Perovskites via Chemical Substitution

S. A. Sunshine; L. F. Schneemeyer; T. Siegrist; D. C. Douglass; J. V. Waszczak; R. J. Cava; E. M. Gyorgy; D. W. Murphy

doi:10.1021/cm00003a011

Stabilization of Strontium Analogues of Barium Yttrium Cuprate Perovskites via Chemical Substitution

S. A. Sunshine, L. F. Schneemeyer, T. Siegrist, D. C. Douglass, J. V. Waszczak, R. J. Cava, E. M. Gyorgy, D. W. Murphy

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Abstract

We report the synthesis and characterization of Sr₂YCu_3-xM_xO_y, M = Al, Pb, Fe, and Co, analogues of the 92 K superconducting perovskite Ba₂YCu₃O₇. While phase-pure Sr₂YCu₃O₇ cannot be prepared, cation substitution for Cu stabilizes this phase. Crystals of these phases were grown from CuO-rich melts containing appropriate melt impurities or from lead oxide based melts. Ceramic samples were prepared for detailed studies of stability ranges, oxygen content, and property/dopant relationships. For Sr₂YCu_3-xM_xO_7+δ, samples with M = Al or Co have δ = 0 for all x and δ > 0 when M = Fe and x ≈ 1. Samples were characterized by resistivity and dc magnetic susceptibility measurements. Superconductivity is observed in samples with low levels of metal substitution; however, the volume fraction is small (<2%) and cannot be uniquely attributed to the perovskite phase. A comparison of solid-state ²⁷Al NMR spectra of Ba- and Sr-based perovskites suggest a different Al environment in these two systems.

Original language	English (US)
Pages (from-to)	331-335
Number of pages	5
Journal	Chemistry of Materials
Volume	1
Issue number	3
DOIs	https://doi.org/10.1021/cm00003a011
State	Published - May 1 1989
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Materials Chemistry

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@article{6b56ebdf22ec4aeb8d38705ae5ca118a,

title = "Stabilization of Strontium Analogues of Barium Yttrium Cuprate Perovskites via Chemical Substitution",

abstract = "We report the synthesis and characterization of Sr2YCu3-xMxOy, M = Al, Pb, Fe, and Co, analogues of the 92 K superconducting perovskite Ba2YCu3O7. While phase-pure Sr2YCu3O7 cannot be prepared, cation substitution for Cu stabilizes this phase. Crystals of these phases were grown from CuO-rich melts containing appropriate melt impurities or from lead oxide based melts. Ceramic samples were prepared for detailed studies of stability ranges, oxygen content, and property/dopant relationships. For Sr2YCu3-xMxO7+δ, samples with M = Al or Co have δ = 0 for all x and δ > 0 when M = Fe and x ≈ 1. Samples were characterized by resistivity and dc magnetic susceptibility measurements. Superconductivity is observed in samples with low levels of metal substitution; however, the volume fraction is small (<2%) and cannot be uniquely attributed to the perovskite phase. A comparison of solid-state 27Al NMR spectra of Ba- and Sr-based perovskites suggest a different Al environment in these two systems.",

author = "Sunshine, {S. A.} and Schneemeyer, {L. F.} and T. Siegrist and Douglass, {D. C.} and Waszczak, {J. V.} and Cava, {R. J.} and Gyorgy, {E. M.} and Murphy, {D. W.}",

year = "1989",

month = may,

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doi = "10.1021/cm00003a011",

language = "English (US)",

volume = "1",

pages = "331--335",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Stabilization of Strontium Analogues of Barium Yttrium Cuprate Perovskites via Chemical Substitution

AU - Sunshine, S. A.

AU - Schneemeyer, L. F.

AU - Siegrist, T.

AU - Douglass, D. C.

AU - Waszczak, J. V.

AU - Cava, R. J.

AU - Gyorgy, E. M.

AU - Murphy, D. W.

PY - 1989/5/1

Y1 - 1989/5/1

N2 - We report the synthesis and characterization of Sr2YCu3-xMxOy, M = Al, Pb, Fe, and Co, analogues of the 92 K superconducting perovskite Ba2YCu3O7. While phase-pure Sr2YCu3O7 cannot be prepared, cation substitution for Cu stabilizes this phase. Crystals of these phases were grown from CuO-rich melts containing appropriate melt impurities or from lead oxide based melts. Ceramic samples were prepared for detailed studies of stability ranges, oxygen content, and property/dopant relationships. For Sr2YCu3-xMxO7+δ, samples with M = Al or Co have δ = 0 for all x and δ > 0 when M = Fe and x ≈ 1. Samples were characterized by resistivity and dc magnetic susceptibility measurements. Superconductivity is observed in samples with low levels of metal substitution; however, the volume fraction is small (<2%) and cannot be uniquely attributed to the perovskite phase. A comparison of solid-state 27Al NMR spectra of Ba- and Sr-based perovskites suggest a different Al environment in these two systems.

AB - We report the synthesis and characterization of Sr2YCu3-xMxOy, M = Al, Pb, Fe, and Co, analogues of the 92 K superconducting perovskite Ba2YCu3O7. While phase-pure Sr2YCu3O7 cannot be prepared, cation substitution for Cu stabilizes this phase. Crystals of these phases were grown from CuO-rich melts containing appropriate melt impurities or from lead oxide based melts. Ceramic samples were prepared for detailed studies of stability ranges, oxygen content, and property/dopant relationships. For Sr2YCu3-xMxO7+δ, samples with M = Al or Co have δ = 0 for all x and δ > 0 when M = Fe and x ≈ 1. Samples were characterized by resistivity and dc magnetic susceptibility measurements. Superconductivity is observed in samples with low levels of metal substitution; however, the volume fraction is small (<2%) and cannot be uniquely attributed to the perovskite phase. A comparison of solid-state 27Al NMR spectra of Ba- and Sr-based perovskites suggest a different Al environment in these two systems.

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DO - 10.1021/cm00003a011

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ER -

Stabilization of Strontium Analogues of Barium Yttrium Cuprate Perovskites via Chemical Substitution

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