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Title: Role of p sub O sub 2 in microstructural development and properties of YBa sub 2 Cu sub 3 O sub x superconductors

Abstract

An evaluation of the effects of oxygen partial pressure ({ital p}{sub {ital O}{sub 2}}) on sintering behavior and the resulting microstructure of YBa{sub 2}Cu{sub 3}O{sub {ital x}} (YBCO) indicates that sintering kinetics are enhanced at reduced {ital p}{sub {ital O}{sub 2}}. The density of specimens sintered at 910 {degree}C increased from 79 to 94% theoretical when {ital p}{sub {ital O}{sub 2}} was decreased from 0.1 to 0.0001 MPa. It is believed that increase in density with decrease in {ital p}{sub {ital O}{sub 2}} is the result of enhanced sintering kinetics, due probably to increased defect concentration, decreased activation energy of the rate-controlling species, and possibly the presence of a small amount of liquid phase. Sintering at 910 {degree}C resulted in a fine-grain microstructure, with an average grain size of {approx}4 {mu}m. Such a microstructure results in reduced microcracking. Consequently, strength as high as 191 MPa is achieved. Reduced microcracking may have important implications for developing microstructures with improved critical current density.

Authors:
; ; ;  [1]
  1. Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
6959830
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Journal Article
Journal Name:
Journal of Materials Research; (United States)
Additional Journal Information:
Journal Volume: 7:9; Journal ID: ISSN 0884-2914
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; MICROSTRUCTURE; SINTERING; COPPER OXIDES; YTTRIUM OXIDES; CRITICAL CURRENT; DENSITY; HIGH-TC SUPERCONDUCTORS; OXYGEN; PARTIAL PRESSURE; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; CRYSTAL STRUCTURE; CURRENTS; ELECTRIC CURRENTS; ELEMENTS; FABRICATION; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Singh, J P, Guttshow, R A, Dusek, J T, and Poeppel, R B. Role of p sub O sub 2 in microstructural development and properties of YBa sub 2 Cu sub 3 O sub x superconductors. United States: N. p., 1992. Web. doi:10.1557/JMR.1992.2324.
Singh, J P, Guttshow, R A, Dusek, J T, & Poeppel, R B. Role of p sub O sub 2 in microstructural development and properties of YBa sub 2 Cu sub 3 O sub x superconductors. United States. doi:10.1557/JMR.1992.2324.
Singh, J P, Guttshow, R A, Dusek, J T, and Poeppel, R B. Tue . "Role of p sub O sub 2 in microstructural development and properties of YBa sub 2 Cu sub 3 O sub x superconductors". United States. doi:10.1557/JMR.1992.2324.
@article{osti_6959830,
title = {Role of p sub O sub 2 in microstructural development and properties of YBa sub 2 Cu sub 3 O sub x superconductors},
author = {Singh, J P and Guttshow, R A and Dusek, J T and Poeppel, R B},
abstractNote = {An evaluation of the effects of oxygen partial pressure ({ital p}{sub {ital O}{sub 2}}) on sintering behavior and the resulting microstructure of YBa{sub 2}Cu{sub 3}O{sub {ital x}} (YBCO) indicates that sintering kinetics are enhanced at reduced {ital p}{sub {ital O}{sub 2}}. The density of specimens sintered at 910 {degree}C increased from 79 to 94% theoretical when {ital p}{sub {ital O}{sub 2}} was decreased from 0.1 to 0.0001 MPa. It is believed that increase in density with decrease in {ital p}{sub {ital O}{sub 2}} is the result of enhanced sintering kinetics, due probably to increased defect concentration, decreased activation energy of the rate-controlling species, and possibly the presence of a small amount of liquid phase. Sintering at 910 {degree}C resulted in a fine-grain microstructure, with an average grain size of {approx}4 {mu}m. Such a microstructure results in reduced microcracking. Consequently, strength as high as 191 MPa is achieved. Reduced microcracking may have important implications for developing microstructures with improved critical current density.},
doi = {10.1557/JMR.1992.2324},
journal = {Journal of Materials Research; (United States)},
issn = {0884-2914},
number = ,
volume = 7:9,
place = {United States},
year = {1992},
month = {9}
}