DocumentCode :
1123158
Title :
Correlation Between Enhanced 
, Orthorhombicity and the Volume of the Unit Cell in Argon Preheated SrBaCu<sub>3</sub>O<sub>6+z</sub>. Each sample was subject to two types of heat treatment: oxygen annealing [O] and argon annealing followed by oxygen annealing [AO]. For each x, the [AO] treatment increases the orthorhombicity epsiv = (<i>b</i> -<i>a</i>) / (<i>b</i> + <i>a</i>) (for 0 les <i>x</i> les 1), <i>T</i> <sub>c</sub> (for <i>x</i> ges 0.4) and the distance <i>d</i> [<i>Cu</i>(1) - (<i>Sr</i> / <i>Ba</i>)] (decrease <i>T</i> <sub>c</sub> ) for <i>x</i> < 0.5 and decrease it (increase <i>T</i> <sub>c</sub> ) for <i>x</i> > 0.5 . When x increase from 0 to 1, epsiv decreases with <i>T</i> <sub>c</sub>[<i>O</i>]. However, <i>T</i> <sub>c</sub>[<i>AO</i>] decreases with epsiv until x = 0.2 and after it increases by 6 K to 85 K for x = 1 [AO]. A remarkable correlations were observed between <i>Tc</i>(<i>x</i>) and the volume of the unit cell <i>V</i> (<i>x</i>) ; and between delta<i>T</i> <sub>c</sub>(<i>x</i>) = <i>T</i> <sub>c</sub>[<i>AO</i>] - <i>T</i> <sub>c</sub>[<i>O</i>] and deltaepsiv(<i>x</i>). A combination of several factors such as decrease in <i>d</i> [<i>Cu</i>(1) - (<i>Sr</i> / <i>Ba</i>)]; increase in cationic and chain oxygen ordering; the number <i>p</i> <sub>sh</sub>(<i>x</i>) of holes by Cu(2) - O<sub>2</sub> superconducting plans and in-phase purity for the [AO] samples may account for the observed data.</div>
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<div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Keywords : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>X-ray diffraction; annealing; barium compounds; crystal structure; high-temperature superconductors; magnetic susceptibility; samarium compounds; solid-state phase transformations; strontium compounds; superconducting transition temperature; yttrium compounds; (Y<sub>1-x</sub>Sm<sub>x</sub>)SrBaCu<sub>3</sub>O<sub>6+z</sub>; AC susceptibility measurements; Rietveld refinement; X-ray diffraction; annealing; critical temperature; heat treatments; orthorhombicity; phase transition; unit cell; <formula formulatype=)
$({rm Y}_{1-{rm x}}{rm Sm}_{rm x})({rm SrBa}){rm Cu}_{3}{rm O}_{6+{rm z}}$ ; Ceramic cuprites; chain oxygen order-disorder; heat treatments control of $T_{c}$
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2009.2017849
Filename :
5153135
Link To Document :
