Models of Nonthermal Effects on Ionic Mobility During Microwave Processing of Crystalline Solids,
Abstract
Models for nonthermal effects on ionic motion during microwave heating of crystalline solids are proposed to explain the anomalous reductions of activation energy for diffusion and the overall faster kinetics noted in microwave sintering experiments and other microwave processing studies. Radiation energy couples into low frequency elastic oscillations, generating a nonthermal phonon distribution that enhances ion mobility and diffusion rates. It is argued that the effect of the microwaves is not to reduce the activation energy, but rather to render the use of a 'Boltzmann' thermal model inappropriate for the inference of activation energy from sintering-rate or tracer-diffusion data. Mechanisms are discussed for how such photon/phonon coupling might occur.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 27, 1992
- Accession Number
- ADP007731
Entities
People
- I. Dobson
- J. H. Bookse
- L. Mccaughan
- R. F. Cooper
Organizations
- University of Wisconsin–Madison