Volume 3, Issue 2 (10-1995)                   www.ijcm.ir 1995, 3(2): 123-136 | Back to browse issues page

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X-Ray Profile Refinement of La2Cu04. www.ijcm.ir. 1995; 3 (2) :123-136
URL: http://ijcm.ir/article-1-913-en.html
Abstract:   (2009 Views)

Thl.: Ri elwc ld mc thod ofstructurl.: refinement
from powder dilTr<:lction patterns is widely used with neutron
data and int:reasingly so with x* ray data . [n this p<:lper the
Ril.:tveld method has hccn cxplainl.:d. As an ex.ample the
t: rystal :-.truclure of LazCu04 at rollm It:mperaturc has been
refined using x*ray powder dirfr<:lctiol1 data. The crystal
,lruc lure is llflhorombi c wilh a = 5.154S(4)A .
h = 5.411116(1)A . c = 13.1529 (9)A. and space gfllUp em,"'
A sample of La2Cu04 has been oxidized to La2Cu04+0 and
its magnetic susceptibily as a function or temperature has
heen studied. The new m(ltcrial is supcrconductor with
Tc == 30K. Further investigation is in progress to determine
the va lue or () and the position of the extra oxygen atOl11s in
tht..: cell.

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