Abstract
In view of the excellent piezoelectric performances of bismuth layered structure ferroelectrics at high temperature, Na0.5Bi4.5Ti4O15:xEr3+ ceramics have been successfully manufactured by the traditional high temperature solid state method. The influence of additive (Er3+) concentration on the phase structure, morphology and electrical properties of ceramics has been investigated. After Er3+ ion introduction, the ferroelectric properties are palpably enhanced, and the 2Pr reaches 30 μC/cm2 at x = 0.004. Furthermore, the ferroelectric domain structure of ceramics was characterized by PFM for the first time. Meanwhile, a reversible photochromic (PC) reaction and the associated luminescence modulation are achieved. It is found that a higher ΔIdec of 83.6% is obtained using down-conversion (DC) mode than up-conversion (UC) one. More importantly, an additional exposure to natural light can further enhance the ΔIdec from 73% to 80.5% after 407 nm irradiation. The present investigation suggests that the modified NBT ceramics with multiple performances facilitate the development of multifunctional materials used in electric devices, anti-counterfeiting and information storage.
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