Tristate ferroelectric memory effect attained by tailoring the ferroelectric behavior in Bi1/2(Na0.8K0.2)1/2TiO3 with Eu doping

Differ from the rapid development of piezoelectricity in potassium sodium niobate (KNN) ceramics, the progress of photoluminescence in transparent KNN ferroelectric ceramics remains stagnant. Herein, europium (Eu)‐doped KNN ceramics have been prepared to investigate its local structure and optical–electrical multi‐functionality. Both enhanced piezoelectricity in ceramics with a bimodal distribution of grain size and improved luminescent property in ceramics with refined grain size can be achieved by adjusting the content of Eu. The addition of Eu can destroy long‐range ferroelectric orders, leading to the formation of pseudo‐cubic phase and polar nanoregions (PNRs). The highly activated PNRs promoted electric field‐induced domain switching and nearly reversible piezo/ferroelectric properties. First‐principles calculations show that Eu substitution will lead to local inhomogeneous chemical bond environment, affecting the local electric/elastic fields and crystal fields, and then benefiting to the luminescence behavior, including both the intensity and lifetime. We believe that this work can benefit to the development of KNN transparent luminescent ceramics and the light‐emitting devices.

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Tristate ferroelectric memory effect attained by tailoring the ferroelectric behavior in Bi_1/2(Na_0.8K_0.2)_1/2TiO₃ with Eu doping

Abstract: By Eu doping, the relaxor behavior of BNKT is tailored to meet the tristate ferroelectric memory effect. The principle and the feasibility of this effect have been thoroughly illustrated both by theory and by experimental verification test.

Cited by 2 publications

References 43 publications

Enhanced energy storage performance, breakdown strength, and thermal stability in compositionally designed relaxor Eu3+ substituted Na0.2K0.3Bi0.5TiO3

Enhanced energy storage performance, breakdown strength, and thermal stability in compositionally designed relaxor Eu3+ substituted Na0.2K0.3Bi0.5TiO3

KNN–Eu transparent ferroelectrics: Local structure and luminescent property

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