The crystalline samples of La_1−xEr_xCrO₃ (x = 0.0, 0.2, 0.4, 0.6) system have been synthesized through the sol–gel process. The XRD pattern of the pristine LaCrO₃ displays the single-phase characteristics having orthorhombic crystal structure with Pnma space group. On the other hand, the Er-doped samples exhibit the mixed-phase attributes of both parent and ErCrO₃ compounds. The structural alteration from LaCrO₃ to ErCrO₃ increases with the increase in doping content. The escalation in the Er doping amount leads to a decline in the crystallite size and unit cell volume. TEM analysis verifies that the particle size reduces from 423 to 328 nm, as the content of Er in the crystal lattice is increased. The UV/Vis spectroscopy specifies that the energy band gap (E_g) values rise slightly with the increment in the doping quantity of Er in the LaCrO₃. The Urbach energy is also found to increase in the doped samples. The effect of Er doping on optical constants namely refractive index, extinction coefficient, and optical conductivity has been investigated. The study on dielectric parameters infers that the dielectric constant and loss tangent (tanδ) display the typical dispersive behavior attributed to the Maxwell–Wagner interfacial polarization. These samples follow the UDR model only in the high-frequency regime. The electric modulus exploration ascertained that grains are mainly involved in the conduction process in these samples. The frequency-dependent ac conductivity plot indicated that these samples follow the Jonscher empirical power law in the given frequency range.

中文翻译：

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掺杂物引起Er掺杂LaCrO 3的结构，形态，光学和介电性能的改变

La _{1- x} Er _x CrO ₃（x  = 0.0，0.2，0.4，0.6）系统的晶体样品是通过溶胶-凝胶过程合成的。原始LaCrO ₃的XRD图谱显示具有正交晶体结构且具有Pnma空间群的单相特性。另一方面，掺Er样品表现出母体化合物和ErCrO ₃化合物的混合相属性。从LaCrO ₃到ErCrO ₃的结构变化随着掺杂含量的增加而增加。Er掺杂量的增加导致微晶尺寸和晶胞体积的减小。TEM分析证实，随着晶格中Er含量的增加，粒径从423nm减小至328nm。UV / Vis光谱表明，随着LaCrO ₃中Er掺杂量的增加，能带隙（E _g）值略有上升。还发现Urbach能量在掺杂样品中增加。已经研究了Er掺杂对光学常数即折射率，消光系数和光导率的影响。上介电参数推断的研究，介电常数和损耗角正切（黄褐色δ）展示了归因于麦克斯韦-瓦格纳界面极化的典型色散行为。这些样本仅在高频范围内遵循UDR模型。电模探查确定这些样品中晶粒主要参与导电过程。频率相关的交流电导率图表明，这些样品在给定的频率范围内遵循Jonscher经验功率定律。