Abstract The La0.8Co0.2-xEuxTiO3 (x = 0.01, 0.02, 0.03 & 0.04)/LCET nanorods are synthesized via the hydrothermal technique. The tetragonal phases are detected by the X-ray diffraction (XRD) patterns. In addition, few minor orthorhombic α-Eu2TiO3 phases are noticed. The field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM) pictures show the sequential evolution of nanorods as a function of Eu-content. The x = 0.04 content exhibits the complete formation of nanorods. The wide optical band gap (Eg) of x = 0.01, 0.03 & 0.04 contents is increased from 3.621 to 3.973 eV while the narrow Eg ~ 2.293 eV is observed for x = 0.02 content. Interestingly, the high negative dielectric constant (ɛ′) and dielectric loss (ɛ″) values of −78.68 and − 202.84, respectively, are recorded at 8 MHz frequency, for x = 0.04 content. This kind of metamaterials like behavior can offer the high frequency microwave device applications. Furthermore, the frequency dependency of dielectric constant, dielectric loss, ac-electrical conductivity, dielectric modulus, and impedance parameters is described.

中文翻译：

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四方 La0.8Co0.2-xEuxTiO3 (x = 0.01–0.04) 纳米棒中的负介电行为

摘要 La0.8Co0.2-xEuxTiO3 (x = 0.01, 0.02, 0.03 & 0.04)/LCET 纳米棒是通过水热技术合成的。通过 X 射线衍射 (XRD) 图案检测四方相。此外，很少注意到少量正交α-Eu2TiO3 相。场发射扫描电子显微镜 (FESEM) 和透射电子显微镜 (TEM) 图片显示了纳米棒随 Eu 含量变化的顺序演化。x = 0.04 含量表现出纳米棒的完全形成。x = 0.01、0.03 和 0.04 含量的宽光学带隙 (Eg) 从 3.621 增加到 3.973 eV，而对于 x = 0.02 含量观察到窄 Eg ~ 2.293 eV。有趣的是，对于 x = 0，在 8 MHz 频率下记录了分别为 -78.68 和 - 202.84 的高负介电常数 (ɛ′) 和介电损耗 (ɛ″) 值。04 内容。这种类似超材料的行为可以提供高频微波器件应用。此外，还描述了介电常数、介电损耗、交流电导率、介电模量和阻抗参数的频率依赖性。