In this study, we fabricated Li⁺ doped Bi_1/2Na_1/2-xLi_xTiO₃ [BNLT] (x = 0.0, 0.025, 0.05, 0.075 and 0.1) nanoceramics by double sintered solid-state reaction method. The structural, optical, dielectric and ferroelectric properties of the ceramic samples have been investigated. X-ray diffraction results confirm that all the ceramics are pure phase perovskite with rhombohedral structure and R3c space group. The different bonds (Bi³⁺/Na⁺/Li⁺ and Ti⁴⁺–O) related to vibrational modes have been studied by analyzing the Raman spectra. The observed optical band gaps were found to decrease from 3.37 to 3.31 eV as the Li⁺ doping is increased. The dielectric permittivity (ε′) and loss factor (tan δ) reduces with a raise in the frequency whereas at elevated frequency both became constant. Dielectric plot show irregular trends with increasing Li⁺ ion replacement. The ac conductivity is found to rise with a higher frequency. Modulus and complex impedance study point toward the continuation of equal grain and grain boundary assistance in BNLT ceramics. The P–E hysteresis loops verify the ferroelectric nature of all the ceramics.

在这项研究中，我们 通过双重烧结的固态反应方法制备了Li ⁺掺杂的Bi _1/2 Na _{1 / 2- x} Li _x TiO ₃ [BNLT]（x = 0.0、0.025、0.05、0.075和0.1）纳米陶瓷。研究了陶瓷样品的结构，光学，介电和铁电性能。X射线衍射结果证实所有陶瓷均为具有菱形结构和R 3 c空间基团的纯相钙钛矿。不同的键（Bi ³⁺ / Na ⁺ / Li ⁺和Ti ⁴⁺-O）与振动模式有关，已通过分析拉曼光谱进行了研究。发现随着Li ⁺掺杂的增加，观察到的光学带隙从3.37 eV减小到3.31 eV 。介电常数（ε' ）和损耗因子（黄褐色δ）在频加注降低而在升高的频率都成为恒定。介电图显示随着Li ⁺离子替代增加的不规则趋势。该交流电导率找到具有更高的频率上升。模量和复数阻抗研究表明，BNLT陶瓷的晶粒和晶界辅助作用均等。该P - Ë 磁滞回线验证了所有陶瓷的铁电特性。