Remote visual monitoring during time resolved in situ neutron diffraction study of recrystallization of melt-cast Bi[sub 1.6]Pb[sub 0.4]Sr[sub 2]Ca[sub 3]Cu[sub 4]O[sub y] by passage of dc current

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  1. Get@NRC: Remote visual monitoring during time resolved in situ neutron diffraction study of recrystallization of melt-cast Bi[sub 1.6]Pb[sub 0.4]Sr[sub 2]Ca[sub 3]Cu[sub 4]O[sub y] by passage of dc current (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1063/1.1148976
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TypeArticle
Journal titleRev. Sci. Instrum.
Review of Scientific Instruments
Volume69
Issue6
Pages24752479; # of pages: 5
Subjectbismuth compounds; calcium compounds; casting; high-temperature superconductors; lead compounds; neutron diffraction; recrystallisation; recrystallisation annealing; strontium compounds
AbstractThe Polaris high intensity, medium resolution, time-of-flight neutron diffractometer at ISIS has been used in a real-time study to observe phase evolution in rods of melt-cast Bi1.6Pb0.4Sr2Ca3Cu4Oy in situ as they were recrystallized by passage of a dc current under a series of controlled atmospheres. Together with simultaneous measurement of current and resistance to facilitate control over sample heating, the experiment required visual monitoring of the sample during neutron diffraction data collection. This article describes the apparatus constructed to carry out these experiments, along with the necessary modifications made to Polaris and its control systems, and presents results which demonstrate the effectiveness of the technique. The results presented show that the initial appearance of the Bi-2201 phase occurred before hot zone formation. On formation of the hot zone, development of Bi-2212 took place at the expense of Bi-2201. Finally, passage of the zone saw the Bi-2212 redissolve and Bi-2201 reform. ©1998 American Institute of Physics.
Publication date
AffiliationNational Research Council Canada; NRC Institute for Chemical Process and Environmental Technology; NRC Institute for Research in Construction
Peer reviewedNo
NPARC number12327693
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Record identifier22b3f124-2b51-40fe-834c-585f6de1e413
Record created2009-09-10
Record modified2016-05-09
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