Polycrystalline Er₃Fe₅O₁₂ ceramic sample was synthesized by a solid-state reaction technique. The dielectric properties of the sample were experimentally studied. A colossal dielectric constant more than 10³ was observed over a wide temperature and frequency range. The dielectric relaxation in the sample was identified by the measurement of permittivity modulus, impedance spectroscopy, and conductivity in detail. At relatively low temperatures (T < 600 K), the dielectric relaxation under high frequencies (f ≥ 50 kHz) is triggered by the dipolar effect accompanied by the Fe²⁺ and Fe³⁺ charge transitions, while that under low frequencies (f ≤ 50 kHz) is mainly be associated with the Maxwell–Wagner effect. Moreover, a low-frequency dielectric relaxation at high temperatures (T ≥ 600 K) is probably evolving from the contribution of oxygen vacancies and grain boundaries, which is also suggested to be the origin of the colossal dielectric constant.

通过固相反应技术合成了多晶的Er ₃ Fe ₅ O ₁₂陶瓷样品。对样品的介电性能进行了实验研究。在较宽的温度和频率范围内观察到大于10 ^3的巨大介电常数。通过测量介电常数，阻抗谱和电导率来确定样品中的介电弛豫。在相对低的温度（Ť  <600 K），在高频率下的介电弛豫（˚F  ≥50千赫）由伴随Fe的偶极效应触发²⁺和Fe ³⁺电荷转移，而在低频率（˚F  ≤50千赫）主要与麦克斯韦-瓦格纳效果相关联。此外，在高温（低频介电弛豫Ť  ≥600 K）可能是从氧空位和晶界的贡献，这是还建议是巨大的介电常数的起源进化。