Comments on the alpha -peak shapes for relaxation in supercooled liquids

M Fuchs, W Gotze, I Hofacker, A Latz
1991 Journal of Physics: Condensed Matter  
The e-peak m t e r functions hs obtained within the mode coupling theory for the supercooled liquid dynamics near the 91transition singularity are discussed. Double peak phenomena are found 84 a generic feature of the theory related to the self crossing of the transition hypersurface. They lead to two scenarios for liquid to glass transitions characterized by e'-e-peak pairs and by o -" x e s accompanied by 7-peaks. An efficient numerical procedure is developed lor the s o lution of the
more » ... ar scaling equations for the master functions. A schematic three component model is used to fit quantitatively the dielectric loss spectra of polyvinylscetate, ortlmterphenyl, CaKNOj and poly propylene glycol, which all deviate strongly from the Kohlrausch decay pattern. The model yields also triple resonances of o7-S-peaks. p < 1 (1) t Also at: 7223 Sj&n L 1986 Phys. Rev. A 33 1254 SjBgren Land GBtae W 1989 Dynamics OJ Disordered Molerials ed D Richter, A J Dianoux, W Petry ~. and J Teixeira (Berlin: Springer) p 18 Williams G and Hains P J 1972 F0mda.g S9mp C h e m Soc. 6 4 Williams G and Watts D C 1970 Tmns. Faraday Soc. 66 80 Wong J and Angel C A 1976 G h s : Sfmcfun b y Spectroscopy (Basel: Marcel Dekker)
doi:10.1088/0953-8984/3/26/022 fatcat:uwl5kjb7ivdoxgw3vaccshhfhm