Abstract We investigate the electrical and magnetic properties of the Bi2Fe4-xGaxO9 (0 ≤ x ≤ 1.6) polycrystalline samples synthesized via solid-state reaction technique. Magnetic susceptibility measurements reveal that lightly doped samples (x 0.8) demonstrate paramagnetic to spin-glass (SG) transition. The variation of irreversible temperature obtained from zero field cooling (ZFC) and field cooling (FC) susceptibilities versus measured magnetic field and low-temperature magnetic hysteresis (M-H) loops support the existence of spin-glass phase. The dielectric constant (Ɛr) of Bi2Fe4-xGaxO9 with Ga-dilution reveals a weak-temperature sensitivity in high-temperature range (300 K ≤ T ≤ 550 K), which is advantageous for high temperature capacitor applications and electronic devices.

中文翻译：

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Bi2Fe4-xGaxO9 (0≤x≤1.6)的合成、结构、电学和磁学性质

摘要 我们研究了通过固态反应技术合成的 Bi2Fe4-xGaxO9 (0 ≤ x ≤ 1.6) 多晶样品的电学和磁学性质。磁化率测量表明，轻掺杂样品 (x 0.8) 表现出顺磁性到自旋玻璃 (SG) 转变。从零场冷却 (ZFC) 和场冷却 (FC) 磁化率与测量的磁场和低温磁滞 (MH) 回路获得的不可逆温度的变化支持自旋玻璃相的存在。具有 Ga 稀释的 Bi2Fe4-xGaxO9 的介电常数 (Ɛr) 在高温范围 (300 K ≤ T ≤ 550 K) 中显示出较弱的温度敏感性，这有利于高温电容器应用和电子设备。