Bi₂Fe₄O₉ was prepared by solid-state reaction and the electrical properties measured by impedance spectroscopy. After annealing in O₂ at 900 °C, Bi₂Fe₄O₉ is an electrically-homogeneous insulator. Its high frequency permittivity is constant (∼14.1) over the temperature range 300–400 °C and shows no evidence of incipient ferroelectricity at lower temperatures. On annealing in N₂ at 900 °C, the pellets gradually decompose.

Bi₂₅FeO₃₉ was prepared by both solid-state reaction and mechanosynthesis. It showed a modest amount of mixed conduction of both oxide ions and holes. Impedance analysis showed a complex response that best fitted an equivalent circuit consisting of a parallel combination of long-range conduction and short range dielectric relaxation elements.

The electrical conductivity of both Bi₂Fe₄O₉ and Bi₂₅FeO₃₉ is less than that of BiFeO₃ prepared by solid-state reaction, which indicates that any leakage conductivity of BiFeO₃ is not due to the possible presence of small amounts of these secondary phases.

通过固相反应制备Bi ₂ Fe ₄ O ₉，并通过阻抗谱法测量电性能。在900°C的O ₂中退火后，Bi ₂ Fe ₄ O ₉是电均匀的绝缘体。它的高频介电常数在300-400°C的温度范围内是恒定的（〜14.1），并且在较低温度下没有显示出初生铁电的迹象。在900°C的N ₂中退火时，颗粒逐渐分解。

通过固相反应和机械合成法制备Bi ₂₅ FeO ₃₉。它显示出适度的氧化物离子和空穴的混合传导。阻抗分析显示出复杂的响应，最适合由长距离导电和短距离介电弛豫元件的并联组合组成的等效电路。

两个Bi的电导率₂的Fe ₄ ø ₉和Bi ₂₅的FeO ₃₉小于的BiFeO的₃由固态反应，这表明的BiFeO的任何泄漏电导率制备₃不是由于少量的可能存在这些第二阶段。