PhaseTransformations in the High-Tc Superconducting Compounds, Ba2RCu3O7-γ (R = Nd, Sm, Gd, Y, Ho, and Er)

Wong-Ng, W.; Cook, L. P.; Su, H. B.; Vaudin, M. D.; Chiang, C. K.; Welch, D. R.; Fuller, E. R.; Yang, Z.; Bennett, L. H.

doi:10.6028/jres.111.004

Title: PhaseTransformations in the High-Tc Superconducting Compounds, Ba₂RCu₃O_7-γ (R = Nd, Sm, Gd, Y, Ho, and Er)

Abstract

The phase transformation between the orthorhombic and tetragonal structures of six high-Tc superconductors, Ba₂RCu₃O_7-γ, where R = Nd, Sm, Gd, Y, Ho, and Er, and δ = 0 to 1, has been investigated using techniques of x-ray diffraction, differential thermal analysis/thermogravimetric analysis (DTA/TGA) and electron diffraction. The transformation from the oxygen-rich orthorhombic phase to the oxygen-deficient tetragonal phase involves two orthorhombic phases. A superlattice cell caused by oxygen ordering, with a' = 2a, was observed for materials with smaller ionic radius (Y, Ho, and Er). For the larger lanthanide samples (Nd, Sm, and Gd), the a' = 2a type superlattice cell was not observed. The structural phase transition temperatures, oxygen stoichiometry and characteristics of the T_c plateaus appear to correlate with the ionic radius, which varies based on the number of f electrons. Lanthanide elements with a smaller ionic radius stabilize the orthorhombic phase to higher temperatures and lower oxygen content. Also, the superconducting temperature is less sensitive to the oxygen content for materials with smaller ionic radius. The trend of dependence of the phase transformation temperature on ionic radius across the lanthanide series can be explained using a quasi-chemical approximation (QCA) whereby the strain effect plays an important rolemore »« less

Authors:

Wong-Ng, W. ^[1]; Cook, L. P. ^[1]; Su, H. B. ^[2]; Vaudin, M. D. ^[1]; Chiang, C. K. ^[1]; Welch, D. R. ^[3]; Fuller, E. R. ^[1]; Yang, Z. ^[1]; Bennett, L. H. ^[1]

National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States). Beckman Inst.
Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Materials Science

Publication Date:: Sun Jan 01 00:00:00 EST 2006

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1628772

Grant/Contract Number:: AC02-98CH10886

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Research of the National Institute of Standards and Technology

Additional Journal Information:: Journal Volume: 111; Journal Issue: 1; Journal ID: ISSN 1044-677X

Publisher:: National Institute of Standards (NIST)

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION; Instruments & Instrumentation; Physics; ac magnetic susceptibility; orthorhombic/tetra-gonal transformation; oxygen ordering; phase transformation of Ba2RCu3O7–δ (R=lanthanides); strain effect on phase transition; transition temperature

Citation Formats


                    Wong-Ng, W., Cook, L. P., Su, H. B., Vaudin, M. D., Chiang, C. K., Welch, D. R., Fuller, E. R., Yang, Z., and Bennett, L. H. PhaseTransformations in the High-Tc Superconducting Compounds, Ba2RCu3O7-γ (R = Nd, Sm, Gd, Y, Ho, and Er).  United States: N. p., 2006. 
Web.  doi:10.6028/jres.111.004.

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                    Wong-Ng, W., Cook, L. P., Su, H. B., Vaudin, M. D., Chiang, C. K., Welch, D. R., Fuller, E. R., Yang, Z., & Bennett, L. H. PhaseTransformations in the High-Tc Superconducting Compounds, Ba2RCu3O7-γ (R = Nd, Sm, Gd, Y, Ho, and Er).  United States.  https://doi.org/10.6028/jres.111.004

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                    Wong-Ng, W., Cook, L. P., Su, H. B., Vaudin, M. D., Chiang, C. K., Welch, D. R., Fuller, E. R., Yang, Z., and Bennett, L. H. Sun .  
"PhaseTransformations in the High-Tc Superconducting Compounds, Ba2RCu3O7-γ (R = Nd, Sm, Gd, Y, Ho, and Er)".  United States.  https://doi.org/10.6028/jres.111.004.  https://www.osti.gov/servlets/purl/1628772.

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@article{osti_1628772,

  title        = {PhaseTransformations in the High-Tc Superconducting Compounds, Ba2RCu3O7-γ (R = Nd, Sm, Gd, Y, Ho, and Er)},

  author       = {Wong-Ng, W. and Cook, L. P. and Su, H. B. and Vaudin, M. D. and Chiang, C. K. and Welch, D. R. and Fuller, E. R. and Yang, Z. and Bennett, L. H.},

  abstractNote = {The phase transformation between the orthorhombic and tetragonal structures of six high-Tc superconductors, Ba2RCu3O7-γ, where R = Nd, Sm, Gd, Y, Ho, and Er, and δ = 0 to 1, has been investigated using techniques of x-ray diffraction, differential thermal analysis/thermogravimetric analysis (DTA/TGA) and electron diffraction. The transformation from the oxygen-rich orthorhombic phase to the oxygen-deficient tetragonal phase involves two orthorhombic phases. A superlattice cell caused by oxygen ordering, with a' = 2a, was observed for materials with smaller ionic radius (Y, Ho, and Er). For the larger lanthanide samples (Nd, Sm, and Gd), the a' = 2a type superlattice cell was not observed. The structural phase transition temperatures, oxygen stoichiometry and characteristics of the Tc plateaus appear to correlate with the ionic radius, which varies based on the number of f electrons. Lanthanide elements with a smaller ionic radius stabilize the orthorhombic phase to higher temperatures and lower oxygen content. Also, the superconducting temperature is less sensitive to the oxygen content for materials with smaller ionic radius. The trend of dependence of the phase transformation temperature on ionic radius across the lanthanide series can be explained using a quasi-chemical approximation (QCA) whereby the strain effect plays an important role on the order-disorder transition due to the effect of oxygen content on the CuO chain sites.},

  doi          = {10.6028/jres.111.004},

  journal      = {Journal of Research of the National Institute of Standards and Technology},

  number       = 1,

  volume       = 111,

  place        = {United States},

  year         = {Sun Jan 01 00:00:00 EST 2006},

  month        = {Sun Jan 01 00:00:00 EST 2006}

}

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Works referencing / citing this record:

Barium Hydroxide Octahydrate (Ba(OH)2·8H2O) as a Substitute Alternative for Barium Carbonate (BaCO3) in Synthesis Superconductor of Nd1Ba2Cu3O7-δ Phase
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Sumadiyasa, M.; Manuaba, I. B. S.; Suardana, P.
Journal of Materials Science and Chemical Engineering, Vol. 06, Issue 07
DOI: 10.4236/msce.2018.67013

Ion-size effects on cuprate High Temperature Superconductors
text, January 2013

Mallett, Benjamin P. P.
arXiv
DOI: 10.48550/arxiv.1310.3055

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