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← ScienceWhich electron behavior explains increasing resistance when dopants exceed solubility limits?
A)Increased electron-phonon scattering
B)Dopant atoms forming secondary phases✓
C)A diminishing dielectric constant
D)Enhanced band gap induced tunneling
💡 Explanation
Secondary phases introduce new interfacial regions that scatter electrons because the **formation of precipitates** disrupts electrical conduction. Therefore, resistance increases, rather than band-gap changes. Electron-phonon scattering describes normal temperature dependance, not effects solubility limits impose.
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