The structural interpretation and electrical properties of perovskite layer structured (PLS) Sr₂Nb₂O₇-xwt%CuO ceramics prepared by solid-state reaction method are investigated. The chemical interpretation of enhanced piezoelectricity is confirmed to be attributed to the rotation and/or distortion of oxygen octahedron caused by possible Cu²⁺ substitution at the A-site of Sr₂Nb₂O₇ by XRD refinement and variable-temperature Raman spectra. Sr₂Nb₂O₇-xwt%CuO (x = 0.3, 0.5 and 0.7) ceramics shows enhanced ferroelectric properties with a larger P_r of ∼4.1 μC/cm² and a smaller E_c of ∼63.1 kV/cm. This study further explains the cations in A-site play a major structural role in the polarization process for PLS system. It was found that dielectric breakdown strength increases up to 258.8 kV/cm and then decreases gradually with the increase of CuO content. Impedance spectroscopy indicated that CuO addition could be helpful in increasing the grain boundary resistance then dielectric breakdown strength.

研究了通过固相反应法制备的钙钛矿层结构（PLS）Sr ₂ Nb ₂ O ₇ - x wt％CuO陶瓷的结构解释和电学性能。通过XRD精炼和可变温度拉曼光谱，证实了增强压电性的化学解释归因于氧八面体的旋转和/或扭曲，这是由于在Sr ₂ Nb ₂ O ₇的A位处可能发生Cu ²⁺取代引起的氧八面体的旋转和/或变形。Sr ₂ Nb ₂ O ₇ - x wt％CuO（x = 0.3，0.5和0.7）陶瓷示出增强的具有较大的铁电性能P _{- [R}的大约4.1mμC/厘米²和较小Ë _Ç的~63.1千伏/厘米。这项研究进一步解释了A位阳离子在PLS系统极化过程中起主要结构作用。发现电介质击穿强度增加到258.8kV / cm，然后随着CuO含量的增加而逐渐减小。阻抗谱表明，添加CuO可能有助于提高晶界电阻，然后提高介电击穿强度。