Microwave Permittivity, Permeability, and Absorption Capability of Ferric Oxide

作者：Peng Zhiwei; Hwang Jiann Yang^*; Park Chong Lyuck; Kim Byoung Gon; Andriese Matthew; Wang Xinli

来源：ISIJ International, 2012, 52(9): 1535-1538.

DOI：10.2355/isijinternational.52.1535

• permittivity
• permeability
• microwave absorption
• microwave penetration depth

The permittivity and permeability measurements of ferric oxide (Fe2O3) were carried out over a broad temperature range from 24 degrees C to above 1 000 degrees C at 915 and 2 450 MHz. The real part and imaginary part of complex relative permittivity (epsilon(r)%26apos; and epsilon(r %26apos;%26apos;)) of ferric oxide slightly increase with temperature below 450 degrees C, above which epsilon(r)%26apos; increases significantly while epsilon(r)%26apos;%26apos; presents a broad dielectric loss peak between 450 and 1 000 degrees C. Contrary to epsilon(r)%26apos; and epsilon(r)%26apos;%26apos;, the real part and imaginary part of complex relative permeability and (mu(r)%26apos; and mu(r)%26apos;%26apos;) remain relatively invariable (1 and 0, respectively) until 700 degrees C. The mu(r)%26apos; values subsequently exhibit a decreasing tendency due to the increased electrical conductivity at higher temperatures while the mu(r)%26apos;%26apos; values stay negligible as temperature increases. The results demonstrate that the dielectric loss is the primary factor contributing to microwave absorption of Fe2O3. The calculation of microwave penetration depth shows that Fe2O3 undergoes a transition from a microwave transparent material to a good microwave absorber with increasing temperature.

• 出版日期2012