【摘要】 采用固相烧结法制备了Eu³⁺掺杂的铌酸钠钾（KNN）陶瓷。用X射线粉末衍射仪、荧光光谱测试仪和LCR精确阻抗测试仪等对其结构、发光性能和介电性能进行表征。XRD结果显示样品为钙钛矿结构。荧光分析结果表明,致密度对KNN陶瓷材料发光性能有一定的影响,Eu³⁺掺杂量是影响其发光性能的重要因素。其中掺杂Eu摩尔分数为4%的样品在930℃焙烧后其发光最强,在396 nm紫外光激发下,发射光谱最强峰在614nm,对应于Eu³⁺的⁵D₀-⁷F₂电偶极跃迁。样品经3 k V/cm、110℃极化30 min后进行压电性能检测,结果表明提高Eu³⁺掺杂量以及陶瓷的致密度,可改善压电性能。其中掺杂4%Eu的KNN压电常数D₃₃最大为98 p C/N,在1 k Hz、100℃时,介电常数最小为217,介电损耗tanθ=0.199,且仍然保持较高的居里温度T_c=426℃。更多还原

【Abstract】 Eu³⁺doped potassium-sodium niobate（KNN）ceramics were fabricated by a solid-state reaction method.X-ray diffraction,photoluminescence spectra and LCR meter were used to characterize the structure and properties of Eu³⁺doped KNN ceramics.XRD results show that the obtained KNN ceramics are orthogonal architecture.The relative density and Eu³⁺doping concentration can affect the luminescent properties of KNN ceramics,Eu³⁺doping mole fraction is a key factor.4%Eu³⁺doped KNN ceramics at 930℃sintering temperature has excellent red-orange luminescence under 396nm excitation,and the strongest emission peak is located at 614 nm,corresponding to⁵D₀-⁷F₂transition of Eu³⁺.The piezoelectric properties of all samples are measured after polarized at 3 k V/cm and110℃for 30 min.The results reveal that the piezoelectric properties can be improved by increasing the Eu³⁺content and the ceramics relative density.KNN-4%Eu³⁺ceramics shows good piezoelectric and dielectric performance.Piezoelectric constant D₃₃reaches up to 98 p C/N,dielectric constantεis217,dielectric loss tanθis 0.199（1 k Hz,100℃）and Curie temperature T_c is 426℃.更多还原