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X is  the  electronegativity  of  the  semiconductor,  which is the  geometric mean of the  electronegativity of  the  constituent atoms.

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liuliu4411

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where Evb the VB edge potential, X is the electronegativity of the semiconductor, which is the geometric mean of the electronegativity of the constituent atoms, E(e) is the energy of free electrons on the hydrogen scale (~4.5ev).Eg is the band gap energy of the semiconductor, and Ecb can be determined by ECB =EVB - Eg. The X values for BaTiO3 and Bi2O3 are ca. 5.242 and 5.986 eV, respectively. The calculated CB and VB edge potentials of BaTiO3 and Bi2O3 are shown in Figure 7. The CB    edge potential of BaTiO3 (-0.83 eV) is more active than that of Bi2O3 (0.11 eV); hence, photoinduced electrons on the BaTiO3 particle surface transfer easily to Bi2O3 via interfaces; similarly, photoinduced holes on the Bi2O3 surface migrate to BaTiO3 owing to the different VB edge potentials.


Bi µç¸ºÐÔÊÇ2.02ev  OµÄµç¸ºÐÔÊÇ3.44ev  ÔõôËã³öBi2O3µÄXÊÇ5.986evµÄ....


¶øÇÒÆªÎÄÕ¼ÆËã³öÀ´µÄCB VB½á¹û¸úAmerican Mineralogist ,Volume 85,Pages 543-556,2000 ÉϼÆËã³öÀ´µÄCB VBÍêÈ«²»Ò»Ñù¡£¡£¡£¡£

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[ Last edited by liuliu4411 on 2008-3-27 at 11:54 ]
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luozemin11

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jwelln

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Originally posted by luozemin11 at 2008-3-27 04:34:
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The Journal of Physical Chemistry C
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