Physical aging of plastoferrites under tensile stress and its effect on microwave properties
| Autor: | W. NDong, C. Brosseau |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 104:064108 |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | Aging phenomena in soft viscoelastic materials have been used as an important tool to investigate the physics of complexity for both scientific and practical purposes. At ambient conditions, microwave frequency-domain spectroscopy (gigahertz-FDS) is employed to investigate the electromagnetic properties at continuum length scales for two commercial plastoferrites (PFs) subjected to a uniaxial tension during a long time t of application. PFs are an attractive prototype for investigating the interactions between polarization and magnetization phenomena, and time. For both PFs we have measured simultaneously the time evolution of the effective complex permittivity e=e′−je″ and magnetic permeability μ=μ′−jμ″ spectra during tensile-loading experiments. These changes allow a determination of how physical aging affects the microwave properties of PFs with tensile elongation in the range of 3%–17% on the time scale of hundreds of hours. At short times of strain application the e and μ measurements under stress ca... |
| Databáze: | OpenAIRE |
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