Sintering of bulk high- Tc superconductors: Y-Ba-Cu-O Page: 6 of 12
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within the grains. The concentration of intragranular porosity was smallest for
the samples sintered at 900 C, which also had the slowest rates of grain growth.
Had the 123 powder been less pure, more liquid would have been present
during sintering, and the grains would have become much longer [14,20,23]. The
aspect ratios would also have been larger. Had the powder been more pure, the
amounts of intragranular porosity would have been less and the times needed to
induce densification would have been longer.E
C
a)6.0
5.8
5.6
5.4
5.2
5.0
4.8
4.60
20
40
Time (h)60
80
Figure 4. Density
temperatures shown;versus sintering time for 123 heat
the theoretical density is 6.3 g/cm3 [1].treated in 02 at the
0'
0 20 40 60
Time (h)5
4
0
U
Q.3
2
0 20 40 60 80
Time (h)80
Figure 5. Data for the 50 largest grains in each image obtained by SEM: (a)
average grain length and (b) average aspect ratio for sintering 'At the following
temperatures: 9000C (filled circles), 930*C (open circles), 960 C open triangles),
and 990 C (filled triangles).- 900 C -
O 930 C
A 960 C .
A 990C.80
60
40(a) '
- -
12
P
1, " 0.
"E
CD201
(b) '.
,o 0 0
A
, e
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Goretta, K.C.; Chen, N.; Lanagan, M.T.; Wu, W.; Singh, J.P.; Olson, R.A. et al. Sintering of bulk high- Tc superconductors: Y-Ba-Cu-O, article, May 1, 1992; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1055481/m1/6/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.