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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). À¨ºÅÖеĵçÊÆÖ¸µÄÊÇʲôµçÊÆ£¿½âÊÍһϠThe 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 ͬÀí£¬À¨ºÅÖеĵçÊÆÊÇָʲôµçÊÆ£¿½âÊÍһϠ×îºó Ïêϸ˵Ã÷Ò»ÏÂÕâ¶Î»°ËµÃ÷ÁËʲôÑùµÄÎÊÌ⣬²»Òª·Òë¹þ£¨ÎÒ»á·Ò룩 »¹ÓУ¬ÂíµÂÂ×µçÊÆÊǸöʲôÑùµÄ¸ÅÄÄÜ·ñÏêϸ˵Ã÷һϠ²»Òª°Ù¶ÈÉÏÃæÕ³ÌùµÄ´ð°¸ лл¡« ½ð±Ò¿ÉÒÔËæÊ±×·¼Ó ![]() [ Last edited by lxg133298 on 2013-7-19 at 10:50 ] |
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