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Note that negatively charged electrons have a lower energy the higher
the Madelung potential (cation sites have a negative potential)
whereas the energy to create a positive hole is lower, the lower
the Madelung energy (anion sites have a positive potential). This
analysis indicates that the Madelung potential of Ti in anatase
( -45.025 V) is 0.17 eV higher than the potential of Ti in rutile
( -45.199 V).
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The offset is in excellent agreement with recent
photoemission measurements. Similarly, the Madelung potential of
O in anatase (26.232 V) is higher than the Madelung potential of
O in rutile (25.767 V), placing the valence band of rutile 0.47 eV
above the valence band of anatase
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lxg133298

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Stay Hungry. Stay Foolish.

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