Novel Sillenites Bi₂₅Fe_(1−x)Al_xO₄₀ (x = 0.00, 0.20, and x = 0.50) have been synthesized using the SSR method. In this paper, the effect of Al-substitution on the physicochemical properties was performed. The X-ray diffraction analysis as well as both Raman and FT-IR spectroscopies indicate that all the elaborated materials have a bcc structure with the I23 space group. The increase of the cell parameters, the morphological features, and thus the decrease of the grain size with Aluminum content is also evidenced via the X-ray patterns and SEM microscopy. DSC measurements highlighted the occurrence of various phenomena related to both structural and dielectric features. The temperature dependence of electrical conductivity and the deduced activation energies pointed to the effect of temperature on the conduction process. The impedance analysis on the samples confirms the onset of relaxation phenomenon in the sample with semiconducting behavior. Furthermore, an AFM-Paramagnetic transition for x = 0.00 and 0.20, with Neel temperatures of 268 and 265 K, respectively. Otherwise, paramagnetic behavior is observed for x = 0.50. The optical measurements make these materials suitable candidates for photocatalysis and optoelectronic applications.

 采用 SSR 方法合成了新型硅长石 Bi ₂₅ Fe _{(1− x )} Al _x O ₄₀ ( x  = 0.00、0.20 和x = 0.50)。本文研究了Al取代对其理化性质的影响。X射线衍射分析以及拉曼和FT-IR光谱表明所有精心制作的材料都具有具有I23空间群的bcc结构。X 射线图案和 SEM 显微镜也证明了电池参数、形态特征的增加，以及晶粒尺寸随铝含量的减小。DSC 测量强调了与结构和介电特征相关的各种现象的发生。电导率的温度依赖性和推导的活化能表明温度对传导过程的影响。对样品的阻抗分析证实了具有半导体行为的样品中弛豫现象的开始。此外， x = 0.00 和 0.20时的 AFM-顺磁转变 ，尼尔温度分别为 268 和 265 K。否则，当x = 0.50时，会观察到顺磁行为 。光学测量使这些材料成为光催化和光电应用的合适候选材料。