Dielectric behaviour and a.c. conductivity in Cu𝑥Fe3â€�?�ð�?�¥O4 ferrite

[摘要] The dielectric properties (dielectric constant and loss) for the system Cu_ð‘�?Fe_{3â€�?�ð�?��?}O₄ with ð‘�? = 1.0, 0.8, 0.6, 0.4 and 0.2, were studied in the temperature range 300 ∼ 800 K and also in the frequency range 1 kHz ∼ 1 MHz. A.c. conductivity was derived from dielectric constant and loss tangent data. The conduction in this system is interpreted as due to small polaron hopping. The dielectric relaxation was observed for the compositions with tetragonal structure whereas normal behaviour was observed for cubic structure.

[学科分类] 材料工程

[关键词] Dielectric constant;polaron hopping.