ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
We fabricated YBCO film using a TFA-MOD method and evaluated the phase formation,texture evolution, and critical properties as a function of the firing temperatures. In order to enhancethe reaction kinetics and to control the formation of the second phases, Y2Ba1Cu1Ox and Ba3Cu5O8powders were used as precursors (the so called “211 process”), instead of Y-, Ba-, and Cu-basedacetate, and dissolved in trifluoroacetic acid (TFA).The films were calcined at 460℃ and then fired at 750℃-800℃ in a 12.1% humidified Ar-O2atmosphere. We found that the microstructure varied significantly with the firing temperature; thegrain grew further and the film became denser as the firing temperature increased. The textures ofall of the films were similar and mainly biaxial. On the other hand, the intensity of the major andminor texture components differed from each other. For the film fired at 775℃, the critical currentwas obtained to be 39 A/cm-width (corresponding critical current density is 2.0 MA/cm2), whichwas probably attributed to such factors as the enhanced phase purity and out-of-plane texture, themoderate film density and grain size, and crack-free surface
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.1601.pdf
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