Assertion: borax's boron | /r/HasProperty | insulator
Facets:
value: at low temperatures
type: TEMPORAL
value: at room temperature
type: OTHER
Source sentences:
text: At room temperature, boron is an insulator, but its electrical conductivity increases with an increase in temperature .
text: The band gap is 1.50 or 1.56 eV. Crystalline boron is an insulator at low temperatures, but becomes a conductor at elevated temperatures, as would be expected as carriers are thermally excited into the conduction band.