HIGH-TEMPERATURE NMR OBSERVATION OF MOBILE PHASES UP TO 1500-DEGREES-C

A new high temperature Nuclear Magnetic Resonance device using double laser heating system has been developed for NMR experiments up to 1500 degrees C. Difficult systems have been investigated, both of theoriti cal and applied interest. We report here three examples, where the app earance and the role of mobile species are characterized by Al-27, Na- 23 and F-19 NMR signal evolution with temperature: solid - liquid tran sition in cryolite Na3AlF6, beta-alpha alumina transformation with flu oride mineralizer, and the effects of mineralizer CaF2 on the high tem perature reactions in the clinker formation.