Abstract
The dielectric properties of totally dried sugi ( Cryptomeria japonica) wood block and powder specimens treated at various temperatures up to 800 °C were measured in the range from 20 Hz to 1 MHz and from −150 to 20 °C. Relaxation ascribed to the motion of methylol groups was detected in specimens treated at temperatures below 300 °C and its magnitude decreased with increasing temperature. The electric conductivity decreased with increasing temperature up to 400 °C. Another form of relaxation was recognized for block specimens treated at temperatures between 500 and 600 °C. Cole–Cole’s circular arc law was applied to the experimental results. The relaxation magnitude was 60–75 and 24–28 in the longitudinal and radial directions of the block specimens, respectively. Identical relaxation was also observed in the powder specimen. The electric conductivity began to increase remarkably from 500 °C. These results suggested that a small volume fraction of particles with large conductivity is formed at microscopic levels in the cell walls. It is considered that this relaxation is due to interfacial polarization.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
