Excess wing in the dielectric loss of glass formers: further evidence for a β-relaxation

Abstract We present dielectric loss spectra of four glass formers (propylene carbonate, glycerol, propylene glycol, and Salol) that are known to show typical excess wings, i.e. a second power law at frequencies above the α-peak. Aging experiments at sub-Tg temperatures reveal a shoulder developing out of the excess wing when thermodynamic equilibrium is approached. This finding provides experimental evidence of a Johari–Goldstein β-relaxation, strongly merged with the α-peak and causing the so-far mysterious excess wing.

• Publication year

  2002

• Venue

  Journal of Non-crystalline Solids

• Publication date

  2002-09-01

• Fields of study

  Materials Science, Chemistry

• Identifiers
  DOI 10.1016/S0022-3093(02)01493-X
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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