Sm^(3+)掺杂0.94Bi_(0.5)Na_(0.5)TiO_(3)-0.06BaTiO_(3)无机多功能陶瓷的储能行为和光致发光性质

Energy storage and photoluminescence properties of Sm^(3+)-doped 0.94Bi_(0.5)Na_(0.5)TiO_(3)-0.06BaTiO_(3) multifunctional ceramics

近年来,无机多功能材料在各个领域得到了广泛的应用.掺杂稀土的铁电材料作为一种新型的无机多功能材料具有很大的潜力.本文系统地研究了Sm^(3+)掺杂的0.94Bi_(0.5)Na_(0.5)TiO_(3)-0.06BaTiO_(3)(BNTBT)陶瓷的铁电、储能行为和光致发光性能.结果表明,Sm^(3+)的引入有效地抑制了BNTBT的晶粒生长,导致剩余极化(P_(r))和矫顽场(E_(c))明显下降.在60 kV/cm的外加电场下,当Sm^(3+)掺杂浓度为0.6%时,W_(rec)达到最大值0.27 J/cm^(3).储能效率(η)随着电场的增加而逐渐降低,在掺杂浓度大于0.6%时稳定在45%附近.此外,在408 nm的近紫外光的激发下,所有Sm^(3+)掺杂的样品都表现出可见光的输出,当Sm^(3+)的掺杂量为1.0%时发光强度达到最大,在701 nm处(^(4)G_(5/2)→^(6)H_(11/2))发光强度的相对变化(ΔI/I)达到700%.本文制备了一种同时具有储能和光致发光特性的新型陶瓷,为无机多功能材料的开发提供了一种有希望的策略.

In recent years,inorganic multifunctional ferroelectric ceramics have been widely utilized in various fields,including aerospace,optical communication,and capacitors,owing to their high stability,easy synthesis,and flexibility.Rare-earth doped ferroelectric materials hold immense potential as a new type of inorganic multifunctional material.This work focuses on the synthesis of x%Sm^(3+)-doped 0.94Bi_(0.5)Na_(0.5)TiO_(3)-0.06BaTiO_(3)(BNTBT:x%Sm^(3+)in short)ceramics by using the conventional solid-state sintering method,aiming to comprehensively investigate their ferroelectric,energy storage,and photoluminescence(PL)properties.The X-ray diffraction analysis reveals that the introduction of Sm^(3+)does not trigger off the appearing of secondary phases or changing of the original perovskite structure.The scanning electron microscope(SEM)images demonstrate that Sm^(3+)incorporation effectively restrains the grain growth in BNTBT,resulting in the average grain size decreasing from 1.16 to 0.95μm.The reduction in remanent polarization(P_(r))and coercive field(E_(c))can be attributed to both the grain size refinement and the formation of morphotropic phase boundaries(MPBs).Under an applied field of 60 kV/cm,the maximum value of energy storage density(W_(rec))reaches to 0.27 J/cm^(3) at an Sm^(3+)doping concentration of 0.6%.The energy storage efficiency(h)gradually declines with electric field increasing and stabilizes at approximately 45% for Sm^(3+)doping concentrations exceeding 0.6%.This result can be ascribed to the decrease in DP(P_(max)-P_(r))due to the growth of ferroelectric domains as the electric field increases.Additionally,all Sm^(3+)-doped BNTBT ceramics exhibit outstanding PL performance upon being excited with near-ultraviolet(NUV)light at 408 nm,without peak position shifting.The PL intensity peaks when the Sm^(3+)doping concentration is 1.0%,with a relative change(ΔI/I)reaching to 700% at 701 nm(^(4)G_(5/2)→^(6)H_(11/2)).However,the relative change in PL intensity is minimum at 562 nm(^(4)G_(5/2)→^(6)H_(5/2))due to the fact that the ^(4)G_(5/2)→^(6)H_(5/2) transition represents a magnetic dipole transition,and the PL intensity remains relatively stable despite variations in the crystal field environment surrounding Sm^(3+).Our successful synthesis of this novel ceramic material,endowed with both energy storage and PL properties,offers a promising avenue for developing inorganic multifunctional materials.The Sm^(3+)-doped BNTBT ceramics hold considerable potential applications in optical memory and multifunctional capacitors.