We report the structural, dielectric, ferroelectric and piezoelectric properties of Gd³⁺ doped lead-free (K_0.5Na_0.5)_0.96Li_0.04(Nb_0.8Ta_0.20)O₃ (KNLNT) ceramics. The transition temperature (T_T-C and T_O-T) shifted towards the lower temperature (281 °C and 110 °C) for (K_0.5Na_0.5)_0.92Li_0.04Gd_0.04(Nb_0.8Ta_0.20)O₃ (KNLGNT) ceramics. Frequency dispersion of T_T-C or T_O-T suggests that KNLGNT ceramics exhibit a relaxor behavior supported by the Vogel-Fulcher law and modified Curie Weiss law. Temperature-dependent resistivity analysis shows that the conduction mechanism follows Mott’s variable range hopping with an average hopping length of 7.23 nm, hopping energy 0.46 eV and density of states near the Fermi level [N(E_F)] = 129 × 10¹⁶ eV⁻¹ cm⁻³ for KNLGNT ceramics. Reduction in leakage current and enhancement in dielectric (ε_r = 1025, tanδ = 0.061 at 1 MHz), ferroelectric properties (P_r = 23.14 μC/cm²_, E_C = 8.70 kV/cm at 1 Hz) and piezoelectric properties (k_p (53%) and d₃₃ (128 pC/N)) were observed for KNLGNT ceramics, which are promising for high-frequency piezoelectric devices.

我们报告了Gd ³⁺掺杂的无铅（K _0.5 Na _0.5）_0.96 Li _0.04（Nb _0.8 Ta _0.20）O ₃（KNLNT）陶瓷的结构，介电，铁电和压电性能。对于（K _0.5 Na _0.5）_0.92 Li _0.04 Gd _0.04（Nb _0.8 Ta _0.20）O ₃（KNLGNT）陶瓷，转变温度（T _T-C和T _O-T）向较低温度（281°C和110°C）转移。频散T _T-C或T _O-T表明，KNLGNT陶瓷表现出松弛行为，得到了Vogel-Fulcher定律和修正的Curie Weiss定律的支持。温度依赖性电阻率分析表明，该传导机制如下莫特的可变范围内的7.23纳米的平均跳跃长度跳频，跳频能量0.46 eV和费米能级附近[N（E态密度_˚F）] = 129×10 ¹⁶ 电子伏特^-对于KNLGNT陶瓷，为¹  cm ^-3。降低漏电流并增强电介质（_εr  = 1025，tanδ= 0.061在1 MHz时），铁电特性（P _r  = 23.14μC/ cm ² _， E _C 在1 Hz时= 8.70 kV / cm）和KNLGNT陶瓷的压电性能（k _p（53％）和d ₃₃（128 pC / N））被观察到，这对高频压电器件很有希望。