In this study, Ba₄RCo_0.5Nb_9.5O₃₀ (R = La, Nd, Sm, Eu) (BRCN) ceramics were synthesized using a high-temperature solid-state reaction. The XRD refinement results show that ceramic samples are tetragonal tungsten bronze (TTB). As the radius of rare-earth ions decreases, the unit cell volume of BRCN ceramics decreases, and the radius difference between Ba²⁺ and R ions increase, which results in BO₆ octahedral distortion and the Raman peaks shift to high frequency. In addition, as the radius of rare-earth ions decreases, the ionic displacements increase and thus the dielectric constant peak temperature goes up. The high-temperature impedance results show that there exists n-type electronic conduction in the samples. The remanent polarization of the P–E curve at low frequencies increases from 0.470 to 1.038 μC cm⁻² as the rare-earth ion radius decreases.

在本研究中，使用高温固相反应合成了Ba ₄ RCo _0.5 Nb _9.5 O ₃₀ (R = La、Nd、Sm、Eu) (BRCN) 陶瓷。XRD精修结果表明陶瓷样品为四方钨青铜(TTB)。随着稀土离子半径的减小，BRCN陶瓷的晶胞体积减小，Ba ²⁺与R离子的半径差增大，导致BO ₆八面体畸变和拉曼峰移至高频。此外，随着稀土离子半径的减小，离子位移增加，因此介电常数峰值温度升高。高温阻抗结果表明样品中存在n型电子传导。随着稀土离子半径的减小，低频下 P-E 曲线的剩余极化从 0.470 增加到 1.038 μC cm ^-2。