How does boron conduct electricity at high temperatures?

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A labeled diagram of the periodic table entry for boron shows its atomic number 5, symbol B, electron configuration, atomic weight range, and classification as a solid, weakly acidic, other nonmetal with a rhombohedral crystal structure at room temperature. — boron Properties of boron.

Pure crystalline boron is a semiconductor, meaning its ability to conduct electricity changes significantly with temperature. At low temperatures, it acts almost as an insulator, but at high temperatures, it conducts electricity similarly to a metal.1