Assertion: y | /r/HasProperty | key ingredient
Facets:
value: in the yttrium barium copper oxide
type: OTHER
Source sentences:
text: Yttrium is a key ingredient in the yttrium barium copper oxide (YBa 2 Cu 3 O 7 , aka 'YBCO' or '1-2-3') superconductor developed at the University of Alabama and the University of Houston in 1987.