semiconductor-metal transition

https://doi.org/10.1351/goldbook.S05597
Any transition from a @[email protected] to a metallic state under the influence of a temperature or pressure change or both. Examples:
1. Ti2O3: band-edge crossing in a @[email protected] to semimetal transition.
2. SmS: localized level crossing a band edge. In SmS hydrostatic pressure above the @[email protected] $$P_{\text{c}}\approx 0.65\ \mathrm{GPa}$$ broadens the Sm-5d band to make the band edge cross the Sm-$$4\text{f}^{6}$$ level.
3. A @[email protected]
4. A @[email protected]
Source:
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 590 [Terms] [Paper]