Synthesis and crystal chemistry of the new compounds GdBa4Cu3O8.5+δ and DyBa4Cu3O8.5+δ

Y. T. Zhu; E. J. Peterson; P. S. Baldonado; J. Y. Coulter; D. E. Peterson; F. M. Mueller

doi:10.1557/JMR.1999.0049

Synthesis and crystal chemistry of the new compounds GdBa₄Cu₃O_8.5+δ and DyBa₄Cu₃O_8.5+δ

Y. T. Zhu, E. J. Peterson, P. S. Baldonado, J. Y. Coulter, D. E. Peterson, F. M. Mueller

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

8 Citations (Scopus)

Abstract

Two new compounds, GdBa₄Cu₃O_8.5+δ (Gd143) and DyBa₄Cu₃O_8.5+δ (Dy143), were synthesized from precursors Gd₂O₃, Dy₂O₃, BaO₂, and CuO at 1000°C in an oxygen atmosphere. The oxygen stoichiometric value δ was found to be 0.68 for Gd143 and 0.6 for Dy143 by iodometric titration. Rietveld refinement of x-ray powder diffraction data showed that Gd143 belongs to the space group Pm3 while Dy143 belongs to the space group P23. The two space groups, Pm3 and P23, are very similar. Their main difference is that P23 does not have the inversion symmetry of Pm3. Both compounds have a cubic unit cell with a lattice parameter of 8.16528 ± 0.00006 Å for Gd143 and 8.10807 ± 0.00010 Å for Dy143. Superconducting quantum interference device (SQUID) measurement indicated that neither compound was superconductive down to 5 K.

Original language	English
Pages (from-to)	334-339
Journal	Journal of Materials Research
Volume	14
Issue number	2
DOIs	https://doi.org/10.1557/JMR.1999.0049
Publication status	Published - Feb 1999
Externally published	Yes

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@article{a6ac82c8e6344e6898d6164358016896,

title = "Synthesis and crystal chemistry of the new compounds GdBa4Cu3O8.5+δ and DyBa4Cu3O8.5+δ",

abstract = "Two new compounds, GdBa4Cu3O8.5+δ (Gd143) and DyBa4Cu3O8.5+δ (Dy143), were synthesized from precursors Gd2O3, Dy2O3, BaO2, and CuO at 1000°C in an oxygen atmosphere. The oxygen stoichiometric value δ was found to be 0.68 for Gd143 and 0.6 for Dy143 by iodometric titration. Rietveld refinement of x-ray powder diffraction data showed that Gd143 belongs to the space group Pm3 while Dy143 belongs to the space group P23. The two space groups, Pm3 and P23, are very similar. Their main difference is that P23 does not have the inversion symmetry of Pm3. Both compounds have a cubic unit cell with a lattice parameter of 8.16528 ± 0.00006 {\AA} for Gd143 and 8.10807 ± 0.00010 {\AA} for Dy143. Superconducting quantum interference device (SQUID) measurement indicated that neither compound was superconductive down to 5 K. ",

author = "Zhu, {Y. T.} and Peterson, {E. J.} and Baldonado, {P. S.} and Coulter, {J. Y.} and Peterson, {D. E.} and Mueller, {F. M.}",

year = "1999",

month = feb,

doi = "10.1557/JMR.1999.0049",

language = "English",

volume = "14",

pages = "334--339",

journal = "Journal of Materials Research",

issn = "0884-2914",

publisher = "Springer International Publishing ",

number = "2",

}

TY - JOUR

T1 - Synthesis and crystal chemistry of the new compounds GdBa4Cu3O8.5+δ and DyBa4Cu3O8.5+δ

AU - Zhu, Y. T.

AU - Peterson, E. J.

AU - Baldonado, P. S.

AU - Coulter, J. Y.

AU - Peterson, D. E.

AU - Mueller, F. M.

PY - 1999/2

Y1 - 1999/2

N2 - Two new compounds, GdBa4Cu3O8.5+δ (Gd143) and DyBa4Cu3O8.5+δ (Dy143), were synthesized from precursors Gd2O3, Dy2O3, BaO2, and CuO at 1000°C in an oxygen atmosphere. The oxygen stoichiometric value δ was found to be 0.68 for Gd143 and 0.6 for Dy143 by iodometric titration. Rietveld refinement of x-ray powder diffraction data showed that Gd143 belongs to the space group Pm3 while Dy143 belongs to the space group P23. The two space groups, Pm3 and P23, are very similar. Their main difference is that P23 does not have the inversion symmetry of Pm3. Both compounds have a cubic unit cell with a lattice parameter of 8.16528 ± 0.00006 Å for Gd143 and 8.10807 ± 0.00010 Å for Dy143. Superconducting quantum interference device (SQUID) measurement indicated that neither compound was superconductive down to 5 K.

AB - Two new compounds, GdBa4Cu3O8.5+δ (Gd143) and DyBa4Cu3O8.5+δ (Dy143), were synthesized from precursors Gd2O3, Dy2O3, BaO2, and CuO at 1000°C in an oxygen atmosphere. The oxygen stoichiometric value δ was found to be 0.68 for Gd143 and 0.6 for Dy143 by iodometric titration. Rietveld refinement of x-ray powder diffraction data showed that Gd143 belongs to the space group Pm3 while Dy143 belongs to the space group P23. The two space groups, Pm3 and P23, are very similar. Their main difference is that P23 does not have the inversion symmetry of Pm3. Both compounds have a cubic unit cell with a lattice parameter of 8.16528 ± 0.00006 Å for Gd143 and 8.10807 ± 0.00010 Å for Dy143. Superconducting quantum interference device (SQUID) measurement indicated that neither compound was superconductive down to 5 K.

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U2 - 10.1557/JMR.1999.0049

DO - 10.1557/JMR.1999.0049

M3 - RGC 21 - Publication in refereed journal

SN - 0884-2914

VL - 14

SP - 334

EP - 339

JO - Journal of Materials Research

JF - Journal of Materials Research

IS - 2

ER -