By Oleg V. Krylov

ISBN-10: 0124272509

ISBN-13: 9780124272507

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Sample text

M o r i n [151], not objecting to these ideas, indicates t h a t t h e p u r e oxides of the transition metals have significant electroconductivity. T o explain this, it is necessary to use zone concepts. I n t h e oxides of t h e transition elements of the fourth period (SC2O3, TiOg , and VgOg), because of a strong cation-cation interaction, a 3rf-zone exists. D u r i n g t h e transitions to the oxides that follow (Fig. 18) t h e r e is even a c a t i o n - F I G . 18. -zone for a series of oxides of transition metals [151].

3. WIDTH OF THE FORBIDDEN ZONE 27 concentration of free holes) is changed with t e m p e r a t u r e approximately according to the exponential law ^ V EXP(-6,+/Är) I n the region of d o p e d c o n d u c t i o n b o t h constants η^^ a n d have significantly lower values t h a n in t h e intrinsic c o n d u c t i o n region. If t h e rate constant of t h e catalytic reaction is proportional to w+, t h e n in selected t e m p e r a t u r e intervals t h e catalysts will possess m a x i m u m values of ^0 in the region of intrinsic c o n d u c t i o n (Fig.

9 , b u t U = 2 . 3 8 eV; for Z n O Ax = 1 . 9 and U = 3 . , t h e ratio of U and Ax are closer to each other t h a n Syrkin shows, especially if one ^ See the table in the Appendix compiled on the basis of a critical examination of a large amount of experimental material and literature data [70, 74, 80, 129-131]. 5. THE DIFFERENCE OF ELECTRONEGATIVITIES 43 takes into account the differences of their structures (sphalerite and wurtzite). It is curious that on t h e basis of t h e tabulated values of Δχ and t h e average principal q u a n t u m n u m b e r Ν one can d r a w several conclu­ sions about the structure of t h e crystal.

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Catalysis by Nonmetals. Rules for Catalyst Selection by Oleg V. Krylov


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