Abstract In the present study, La1 − x Cr x FeO3 (x = 0.0, 0.3, 0.6, 0.9, 1.0) was synthesized by micro-emulsion route and characterized by X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR), Scanning electron microscope (SEM), Energy-dispersive X-ray (EDX) techniques. The dielectric, ferroelectric and photocatalytic properties were investigated and compared with un-doped material. The XRD analysis revealed orthorhombic geometry of La1 − x Cr x FeO3 (x = 0.0, 0.3, 0.6, 0.9, 1.0), Cr was doped successfully into the lattice structure of LaFeO3 and particles were spherical and in agglomerated form. The grain sizes were recorded to be 15, 16.9, 17.1, 17.65 and 18.3 (nm) for La1 − x Cr x FeO3 (x = 0.0, 0.3, 0.6, 0.9, 1.0), respectively. EDX analysis confirmed the purity of LaCrFeO3 samples. The lattice parameters, bulk density, X-ray density, crystalline size and porosity were determined were also determined of all the La1 − x Cr x FeO3 samples. The dielectric constant and dielectric loss values decreased at higher frequency and Cr concentration affected the dielectric properties. The photocatalytic activity (PCA) was evaluated by degrading Congo Red (CR) dye under solar light irradiation and up to 85.43% dye degradation was achieved within 45 min of irradiation. Phyto-toxicity analysis before and after dye degradation was performed, which revealed the toxicity reduction in response of dye degradation. Results revealed that lanthanum ferrite (perovskite) doping with Cr could possibly be employed to enhance the ferroelectric, dielectric and photocatalytic properties.

中文翻译：

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La1 − xCrxFeO3 纳米粒子的微乳液合成：Cr 掺杂对铁电、介电和光催化性能的影响

摘要 本研究采用微乳液法合成了 La1 − x Cr x FeO3 (x = 0.0, 0.3, 0.6, 0.9, 1.0)，并通过 X 射线衍射 (XRD)、傅里叶变换红外 (FTIR)、扫描电子显微镜 (SEM)、能量色散 X 射线 (EDX) 技术。研究了介电、铁电和光催化性能，并与未掺杂的材料进行了比较。XRD 分析揭示了 La1 - x Cr x FeO3 的正交几何形状 (x = 0.0, 0.3, 0.6, 0.9, 1.0)，Cr 成功地掺杂到 LaFeO3 的晶格结构中，颗粒呈球形并呈团块状。La1 - x Cr x FeO3 (x = 0.0, 0.3, 0.6, 0.9, 1.0) 的晶粒尺寸分别记录为 15, 16.9, 17.1, 17.65 和 18.3 (nm)。EDX 分析证实了 LaCrFeO3 样品的纯度。晶格参数、体积密度、X 射线密度、还测定了所有 La1 - x Cr x FeO3 样品的结晶尺寸和孔隙率。介电常数和介电损耗值在较高频率下降低，Cr 浓度影响介电性能。通过在太阳光照射下降解刚果红 (CR) 染料来评估光催化活性 (PCA)，并且在照射 45 分钟内实现了高达 85.43% 的染料降解。进行染料降解前后的植物毒性分析，揭示了染料降解响应中的毒性降低。结果表明，掺杂 Cr 的镧铁氧体（钙钛矿）可能用于增强铁电、介电和光催化性能。介电常数和介电损耗值在较高频率下降低，Cr 浓度影响介电性能。通过在太阳光照射下降解刚果红 (CR) 染料来评估光催化活性 (PCA)，并且在照射 45 分钟内实现了高达 85.43% 的染料降解。进行染料降解前后的植物毒性分析，揭示了染料降解响应中的毒性降低。结果表明，掺杂 Cr 的镧铁氧体（钙钛矿）可能用于增强铁电、介电和光催化性能。介电常数和介电损耗值在较高频率下降低，Cr 浓度影响介电性能。通过在太阳光照射下降解刚果红 (CR) 染料来评估光催化活性 (PCA)，并且在照射 45 分钟内实现了高达 85.43% 的染料降解。进行染料降解前后的植物毒性分析，揭示了染料降解响应中的毒性降低。结果表明，掺杂 Cr 的镧铁氧体（钙钛矿）可能用于增强铁电、介电和光催化性能。通过在太阳光照射下降解刚果红 (CR) 染料来评估光催化活性 (PCA)，并且在照射 45 分钟内实现了高达 85.43% 的染料降解。进行染料降解前后的植物毒性分析，揭示了染料降解响应中的毒性降低。结果表明，掺杂 Cr 的镧铁氧体（钙钛矿）可能用于增强铁电、介电和光催化性能。通过在太阳光照射下降解刚果红 (CR) 染料来评估光催化活性 (PCA)，并且在照射 45 分钟内实现了高达 85.43% 的染料降解。进行染料降解前后的植物毒性分析，揭示了染料降解响应中的毒性降低。结果表明，掺杂 Cr 的镧铁氧体（钙钛矿）可能用于增强铁电、介电和光催化性能。