title: Applicability study of classical and contemporary models for effective complex permittivity of metal powders.
abstract: Microwave thermal processing of metal powders has recently been a topic of a substantial interest; however, experimental data on the physical properties of mixtures involving metal particles are often unavailable. In this paper, we perform a systematic analysis of classical and contemporary models of complex permittivity of mixtures and discuss the use of these models for determining effective permittivity of dielectric matrices with metal inclusions. Results from various mixture and core-shell mixture models are compared to experimental data for a titanium/stearic acid mixture and a boron nitride/graphite mixture (both obtained through the original measurements), and for a tungsten/Teflon mixture (from literature). We find that for certain experiments, the average error in determining the effective complex permittivity using Lichtenecker's, Maxwell Garnett's, Bruggeman's, Buchelnikov's, and Ignatenko's models is about 10%. This suggests that, for multiphysics computer models describing the processing of metal powder in the full temperature range, input data on effective complex permittivity obtained from direct measurement has, up to now, no substitute.
authors.affiliation: Department of Mathematical Sciences, Worcester Polytechnic Institute, Worcester, MA, USA.
authors.forename: Erin M
authors.initials: EM
authors.lastname: Kiley
authors.affiliation: Department of Mathematical Sciences, Worcester Polytechnic Institute, Worcester, MA, USA.
authors.forename: Vadim V
authors.initials: VV
authors.lastname: Yakovlev
authors.affiliation: Laboratory for Advanced Materials Processing, EMPA - Swiss Federal Laboratories for Materials Science and Technology, Thun, Switzerland.
authors.forename: Kotaro
authors.initials: K
authors.lastname: Ishizaki
authors.affiliation: Laboratory for Advanced Materials Processing, EMPA - Swiss Federal Laboratories for Materials Science and Technology, Thun, Switzerland.
authors.forename: Sebastien
authors.initials: S
authors.lastname: Vaucher
mesh_terms: D003198:Computer Simulation; D025802:Electric Capacitance; D008670:Metals / Q000737:chemistry* / Q000528:radiation effects; D008872:Microwaves; D008956:Models, Chemical; D011208:Powders / Q000737:chemistry* / Q000528:radiation effects; D011829:Radiation Dosage
chemical_list: D008670:Metals; D011208:Powders