With the intent to comprehend the structure and hence the property changes in the PrAlO3 system, the substitution of Bi3+ for Pr3+ has been attempted. The samples were synthesized by solution combustion synthesis and characterized extensively. X-ray diffraction studies revealed that the rhombohedral perovskite structure was preserved up to 20 mol% substitution of bismuth, beyond which diffraction peaks of the secondary phase of α-Bi2O3emerged. The structural refinements indicated the increment of both a and c lattice dimensions with an increase in bismuth content. The samples had porous morphology, and a mean pore diameter of 22.4 nm, along with a surface area of 100 m2/g, was deduced from BET measurements for the 20 mol% bismuth-substituted sample. FTIR, Raman spectroscopic and electron microscopic analysis reinforced the perovskite structure adopted by the bismuth-substituted samples. Both Pr and Bi in Pr0.80Bi0.20AlO3 existed in the + 3 oxidation state as established from the XPS analysis. The inclusion of bismuth introduced intermediate energy levels within the bandgap, as suggested by the redshift of the absorption edge for the bismuth-substituted samples. As the optical bandgap values were in the semiconductor regime, the application of bismuth-replaced samples as a catalyst for the photodegradation of crystal violet dye solution was demonstrated. The amount of dye degraded increased with an increase in the amount of bismuth in the sample. Additionally, Pr0.80Bi0.20AlO3 catalyzed the reduction of nitroaromatics promoted possibly by the Bi3+/Bi(0) redox couple.

中文翻译：

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在 PrAlO3 中为 Pr3+ 引入 Bi3+ 的后果

为了理解 PrAlO3 系统的结构和性能变化，尝试用 Bi3+ 代替 Pr3+。样品通过溶液燃烧合成法合成并广泛表征。X 射线衍射研究表明，菱形钙钛矿结构在 20 mol% 的铋取代后得以保留，超过 20 mol% 的 α-Bi2O3 次生相的衍射峰出现。结构改进表明 a 和 c 晶格尺寸随着铋含量的增加而增加。样品具有多孔形态，平均孔径为 22.4 nm，表面积为 100 m2/g，由 20 mol% 铋取代样品的 BET 测量推导出。红外光谱，拉曼光谱和电子显微镜分析增强了铋取代样品采用的钙钛矿结构。Pr0.80Bi0.20AlO3 中的Pr 和Bi 均以+3 氧化态存在，如XPS 分析所确定的。铋的引入在带隙内引入了中间能级，正如铋取代样品的吸收边红移所表明的那样。由于光学带隙值处于半导体范围内，因此证明了铋替代样品作为结晶紫染料溶液光降解催化剂的应用。染料降解的量随着样品中铋量的增加而增加。此外，Pr0.80Bi0.20AlO3 催化了可能由 Bi3+/Bi(0) 氧化还原对促进的硝基芳烃的还原。