Determination of dielectric properties in oriental beech (Fagus orientalis Lipsky) wood

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Mobilya ve Ahşap Malzeme Araştırmaları Dergisi
Cilt: 8 Sayı: 2
Determination of dielectric properties in oriental beech (Fagus orientalis Lipsky) wood

Determination of dielectric properties in oriental beech (Fagus orientalis Lipsky) wood

Pages : 265-280

View : 103 | Download : 178

Publication Date : 2025-12-16

Article Type : Research Paper

Abstract :Today, the wood of the oriental beech (Fagus orientalis Lipsky.) is widely used in various applications, including furniture, musical instruments, carvings, and veneer. In this study, the dielectric properties of oriental beech were investigated at AC signal frequencies of 100 Hz–1 MHz in the voltage range of 0–100 V DC, and the effects of different surface conditions on these properties were investigated. The dielectric, thermal and surface free energy behaviors of control wood (CW) and wood soaked in water for two weeks (SW) were analyzed comprehensively. Basic parameters such as specific heat capacity (Cp), real (ε′) and imaginary (ε″) dielectric constants, alternating current electrical conductivity (σac), free energy component (G/ω), dielectric loss factor (tanδ) were evaluated in detail within the scope of experimental measurements. SW samples exhibited approximately 1,000-fold higher (ε″) values and a two-to three-fold increase in (tanδ) compared to CW samples. Furthermore, (σac) increased from ~10⁻⁹ S/m in CW to ~10⁻⁴ S/m in SW, indicating a significant increase in ionic conductivity due to the higher moisture content. CV samples maintain their insulation properties by showing consistent dielectric properties across the entire frequency range. All measurements were repeated three times (n=3) and the standard deviation was found to be less than 5%. These results show that whereas dry wood retains consistent dielectric performance with low losses, moisture dramatically increases conductivity and dielectric losses.
Keywords : Doğu kayın, Dielektrik özellikler, AC iletkenliği, Frekans

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