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Title: PHASE DIAGRAM STUDIES IN THE SrO-CuO-TiO(2) SYSTEM; APPLICATIONS TO YBCO COATED CONDUCTORS

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
789482
Report Number(s):
LA-UR-01-6735
TRN: US200306%%417
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Dec 2001
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PHASE DIAGRAMS; COATINGS; CONDUCTOR DEVICES; LANL

Citation Formats

A. AYALA, T. G. HOLESINGER, and ET AL. PHASE DIAGRAM STUDIES IN THE SrO-CuO-TiO(2) SYSTEM; APPLICATIONS TO YBCO COATED CONDUCTORS. United States: N. p., 2001. Web.
A. AYALA, T. G. HOLESINGER, & ET AL. PHASE DIAGRAM STUDIES IN THE SrO-CuO-TiO(2) SYSTEM; APPLICATIONS TO YBCO COATED CONDUCTORS. United States.
A. AYALA, T. G. HOLESINGER, and ET AL. Sat . "PHASE DIAGRAM STUDIES IN THE SrO-CuO-TiO(2) SYSTEM; APPLICATIONS TO YBCO COATED CONDUCTORS". United States. doi:. https://www.osti.gov/servlets/purl/789482.
@article{osti_789482,
title = {PHASE DIAGRAM STUDIES IN THE SrO-CuO-TiO(2) SYSTEM; APPLICATIONS TO YBCO COATED CONDUCTORS},
author = {A. AYALA and T. G. HOLESINGER and ET AL},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Dec 01 00:00:00 EST 2001},
month = {Sat Dec 01 00:00:00 EST 2001}
}

Conference:
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  • SrTiO3 (STO) is a potential buffer layer material for use in YBa2Cu3Oy (YBCO) coated conductors based on the IBAD MgO process. However, the interactions with YBCO are not yet fully understood and little information exists in the way of phase diagrams. With this in mind, the tie-line between STO and SrCuO2 in the pseudo-ternary system SrO-CuO-TiO2 was investigated. Phase assemblages and compositions were determined by x-ray diffraction and electron microscopy in the temperature range of 1000oC to 1100oC in oxygen partial pressures of 1%, 10%, and 100%. Preliminary results showed that an appreciable amount of copper substitutes into the STOmore » crystal structure. Conversely, Ti substitution into the SrCuO2 phase was not detected.« less
  • Raman microprobe spectroscopy and scanning electron microscopy were used to study the initial nucleation and growth of YBCO in thick precursors by the BaF2 ex situ process. For quenched films of 2 mum thickness, the data indicate a low density of c-axis nuclei near the substrate, apparently due to a reduced oxygen concentration deep inside the precursor layer. Significant non c-axis growth was also observed; the majority of this material nucleates away from the substrate. Measurement of the conversion rate by in situ XRD for films in the range 0.2-2 {micro}m suggest a weak thickness dependence.
  • New data are presented on the phase equilibria and crystal chemistry of the binary systems SrO-Bi2O3 and SrO-CuO and the ternary system SrO-Bi2O3-CuO. Symmetry data and unit cell dimensions based on single crystal and powder x-ray diffraction measurement are reported for all the binary SrO-Bi2O3 phases, including a new phase identified as Sr6Bi2O9. The ternary system contains at least four ternary phases which can be formed in air at about 900 C. These are identified as Sr2Bi2CuO6, Sr8Bi4Cu5O(19 + x) Sr3Bi2Cu2O8 and a solid solution (the Raveau phase) which, For equilibrium conditions at about 900 C, corresponds approximately to themore » formula Sr(1.8-x)Bi(22+x)Cu(1 + or - x/2)Oz(0.0 = or < about 0.15). Superconductivity in the phase apparently occurs only in compositions that correspond to negative values of x. Compositions that lie outside the equilibrium Raveau-phase field often form nearly homogenous Raveau-phase products. Typically this occurs after relatively brief heat treatments, or in crystallization of a quenched melt.« less
  • Data are presented on the phase equilibria and crystal chemistry of the ternary system SrO-CaO-[1/2]Bi[sub 2]O[sub 3]. Symmetry data and unit-cell dimensions based on single-crystal and powder X-ray diffraction measurements are reported for the two monoclinic phases. The monoclinic phase with a Sr:Ca:Bi ratio of 99:33:68 was shown to have both high- and low-temperature (black) oxidized forms.
  • No abstract prepared.