Determination of Short Range Order (sro) Parameters from Exafs Pair Distribution Functions of Oxide and Silicate Solid Solutions

Short Range Order (SRO) i n c e r t a i n s o l i d so lu t ions can be measured d i r e c t l y from observed EXAFS s t r u c t u r e f u n c t i o n peak areas. Results f o r MgO-FeO, MgO-Li FeO2, and CaMgSi O6 ~ a ~ e 2 + ~ i ~ 0 ~ so lu t ions i n d i c a t e t h a t these are almost completely d i sordere5 a t t h e i r synthesis temperatures. The necessi ty o f s t r u c t u r a l modeling t o ob ta in in te ra tomic distances fo r vary ing compositions and degree of o rder ing i s emphasized.