Assertion: tellurium | /r/HasProperty | doped with copper
Facets:
value: frequently
type: TEMPORAL
Source sentences:
text: Tellurium is a semiconductor and is frequently doped with copper, tin, gold or silver.
text: Tellurium is doped with metals such as silver, gold, tin, and copper.
text: Tellurium is doped with gold and copper in semiconductor applications.
text: Further, tellurium is a semiconductor frequently doped with copper, tin, gold or silver.
text: It is a semiconductor and is often doped with tin, gold, silver, or copper.