Effects of Sr-doping in Ba2Ca2+xCu3+yOz

B. R. Hickey; Z. L. Du; Y. Y. Xue; D. K. Ross; L. M. Dezaneti; Y. Y. Sun; N. L. Wu; C. W. Chu

doi:10.1016/S0022-3697(99)00141-9

Effects of Sr-doping in Ba₂Ca_2+xCu_3+yO_z

B. R. Hickey, Z. L. Du, Y. Y. Xue, D. K. Ross, L. M. Dezaneti, Y. Y. Sun, N. L. Wu, C. W. Chu

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Abstract

Sr is doped into Ba₂Ca_2+xCu_3+yO_z (T_c = 126 K) to improve its chemical stability. A solubility limit of Sr/(Ba + Sr + Ca) approx. 0.3 was observed under our synthesis conditions. Below this limit, Sr is equally distributed among the Ca and Ba sites, and does not not affect the superconductivity significantly. Unfortunately, improvement in the chemical stability of the compound is limited. Above the solubility limit, however, a new compound with an as-synthesized T_c of 106 K becomes the major phase. This phase decomposes into another new compound with T_c approx. 80 K after exposure to humid air. A 0212-type model is proposed, with both Ba and Sr located in the rock-salt layers. The model can accommodate both the local cation stoichiometry and the XRD pattern for this new 106 K-phase.

Original language	English
Pages (from-to)	1655-1662
Number of pages	8
Journal	Journal of Physics and Chemistry of Solids
Volume	60
Issue number	10
DOIs	https://doi.org/10.1016/S0022-3697(99)00141-9
Publication status	Published - 1999 Oct

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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@article{2800a6bccdee4f719c3dbaad677a3261,

title = "Effects of Sr-doping in Ba2Ca2+xCu3+yOz",

abstract = "Sr is doped into Ba2Ca2+xCu3+yOz (Tc = 126 K) to improve its chemical stability. A solubility limit of Sr/(Ba + Sr + Ca) approx. 0.3 was observed under our synthesis conditions. Below this limit, Sr is equally distributed among the Ca and Ba sites, and does not not affect the superconductivity significantly. Unfortunately, improvement in the chemical stability of the compound is limited. Above the solubility limit, however, a new compound with an as-synthesized Tc of 106 K becomes the major phase. This phase decomposes into another new compound with Tc approx. 80 K after exposure to humid air. A 0212-type model is proposed, with both Ba and Sr located in the rock-salt layers. The model can accommodate both the local cation stoichiometry and the XRD pattern for this new 106 K-phase.",

author = "Hickey, {B. R.} and Du, {Z. L.} and Xue, {Y. Y.} and Ross, {D. K.} and Dezaneti, {L. M.} and Sun, {Y. Y.} and Wu, {N. L.} and Chu, {C. W.}",

note = "Funding Information: This work is supported in part by NSF Grant No. DMR 95-00625, EPRI RP-8066-04, the state of Texas through the Texas Center for Superconductivity at the University of Houston, the T.L.L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the Brazilian agency CNPq through the Process No. 200683/93-4.",

year = "1999",

month = oct,

doi = "10.1016/S0022-3697(99)00141-9",

language = "English",

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pages = "1655--1662",

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TY - JOUR

T1 - Effects of Sr-doping in Ba2Ca2+xCu3+yOz

AU - Hickey, B. R.

AU - Du, Z. L.

AU - Xue, Y. Y.

AU - Ross, D. K.

AU - Dezaneti, L. M.

AU - Sun, Y. Y.

AU - Wu, N. L.

AU - Chu, C. W.

N1 - Funding Information: This work is supported in part by NSF Grant No. DMR 95-00625, EPRI RP-8066-04, the state of Texas through the Texas Center for Superconductivity at the University of Houston, the T.L.L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the Brazilian agency CNPq through the Process No. 200683/93-4.

PY - 1999/10

Y1 - 1999/10

N2 - Sr is doped into Ba2Ca2+xCu3+yOz (Tc = 126 K) to improve its chemical stability. A solubility limit of Sr/(Ba + Sr + Ca) approx. 0.3 was observed under our synthesis conditions. Below this limit, Sr is equally distributed among the Ca and Ba sites, and does not not affect the superconductivity significantly. Unfortunately, improvement in the chemical stability of the compound is limited. Above the solubility limit, however, a new compound with an as-synthesized Tc of 106 K becomes the major phase. This phase decomposes into another new compound with Tc approx. 80 K after exposure to humid air. A 0212-type model is proposed, with both Ba and Sr located in the rock-salt layers. The model can accommodate both the local cation stoichiometry and the XRD pattern for this new 106 K-phase.

AB - Sr is doped into Ba2Ca2+xCu3+yOz (Tc = 126 K) to improve its chemical stability. A solubility limit of Sr/(Ba + Sr + Ca) approx. 0.3 was observed under our synthesis conditions. Below this limit, Sr is equally distributed among the Ca and Ba sites, and does not not affect the superconductivity significantly. Unfortunately, improvement in the chemical stability of the compound is limited. Above the solubility limit, however, a new compound with an as-synthesized Tc of 106 K becomes the major phase. This phase decomposes into another new compound with Tc approx. 80 K after exposure to humid air. A 0212-type model is proposed, with both Ba and Sr located in the rock-salt layers. The model can accommodate both the local cation stoichiometry and the XRD pattern for this new 106 K-phase.

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Effects of Sr-doping in Ba₂Ca_2+xCu_3+yO_z

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