AL K-XANES FORMATION IN SOME TETRAHEDRAL AND OCTAHEDRAL COMPOUNDS

Experimental and theoretical study of Al K-XANES in AIPO(4) (berlinite ) and in KAl(SO4)(2)12H(2)O(K-alum) with different types of Al environ ment is performed. Calculations proved that the experimental XANES are well reproduced within EXAFS-like approach to electron scattering des cription i.e. considering the single-, double-and triple-scattering pr ocesses on two and approximately linear three-atoms chains originated at Al-absorbing atom and consisting mainly of O-atoms chosen under the same for both compounds empirical ''selection rule''.