Practical superconductor development for electrical power applications - quarterly report for the period ending December 31, 1998. Page: 4 of 22
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-2-
the other four domains grow with the c-axis parallel to the radius of the pellet
(labeled "1" or "2", and the other two domains misoriented 1800 are degenerate). By
combining this concept with dual-seeding concepts of creating [001] tilt bicrystals, we
can form a variety of grain boundaries. From Fig. 2a, we see that with dual cubic
seeds and perfectly straight grain boundaries, the only [100] tilt GBs that can be
formed are of angle 0 that is equal to the misorientation of domains A and A'
(dictated by the placement of the seeds). However, if the GB macroscopically
meanders (Fig. 2b), we may find that regions intersect, forming 90*-0 [100] tilt grain
boundaries. As the center c-axis normal domains (A and A') grow in a pyramidal
shape, they will eventually touch at some distance vertically from the top of the
pellet, forming the [001] tilt GBs, like those formed by flat Nd-123 seeds.
TOP VIEW SIDE VIEW
c-axis cubic Nd-123 seed Fig. 1.
1 A single cubic Nd-123 seed generates
cai cxifive domains in the Y-123 pellet,
2 2 with three symmetrically unique
1 - orientations misoriented 90* from
each other.
c-axis
1
.2 A :2 2
90-8[100]
4
Fig. 2. Regions A and B represent the c-axis-normal regions of two five-domain
samples, and the numbered regions all have c-axis in the plane of the paper
in the direction of their arrows. When the A and B regions are misoriented
by 0 and with straight grain boundaries, as in (a), they form 0[100] GBs at
intersections of regions 1-1' or 2-2'. If the grain boundaries macroscopically
meander so that they separate regions 1-2' or 2-1', as in (b), a 90*-0[100] grain
boundary is formed. When regions A and B grow together vertically lower
in the pellet, a 0[001] tilt grain boundary is formed.
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Practical superconductor development for electrical power applications - quarterly report for the period ending December 31, 1998., report, January 29, 1999; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc628143/m1/4/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.