ChemInform Abstract: An EXAFS Study of AgPO₃ and AgBaP₃O₉.

Abstract

structure structure (solids and liquids) D 2000 -011An EXAFS Study of AgPO 3 and AgBaP 3 O 9 .-Polycrystalline samples of the title compounds are synthesized by heating stoichiometric quantities of AgNO 3 , BaCO 3 , and NH 4 H 2 PO 4 first to 300 • C and then to 350 • C (AgPO 3 ) or to 450 • C (AgBaP 3 O 9 ) for 24 h. The local structure around the silver atoms in the crystalline and glassy forms of AgBaP 3 O 9 and AgPO 3 is studied by EXAFS. The structure of AgBaP 3 O 9 is representative of isolated silver whereas silver pairs exist in crystalline AgPO 3 . The formation of Ag + -Ag + pairs is detected in the glasses of both compounds. These data are in good agreement with crystal chemistry of silver phosphates and the luminescent properties of these materials. -(BELHAROUAK, I.; FARGIN, E.; PARENT, C.; LE FLEM, G.; AOUAD, H.; MESNAOUI, M.; MAAZAZ, M.; Solid State Sci. 1 (1999) 5, 287-300; Inst. Chim. Matiere Condens. Bordeaux, CNRS, Univ. Bordeaux, F-33608 Pessac, Fr.; EN)