Assertion: crystalline boron | /r/HasProperty | poor conductor of electricity
Facets:
value: under ordinary conditions
type: TEMPORAL
Source sentences:
text: Under ordinary conditions it is a poor conductor of electricity; however, when it is heated to 800° C, its electrical conductivity increases by several orders of magnitude, and the sign of conductivity changes (electron conductivity at low temperature, p-type conductivity at high temperatures).