Er的压电和温度传感特性3 +-掺杂Knn基陶瓷

Abstract

Rare-earth-ion-doped ferroelectrics have garnered significant attention for their multifunctional characteristics, including ferroelectric/piezoelectric and photoluminescent properties, making them ideal for integrated device applications. A novel lead-free luminescent KNN-based ceramic 0.955K0.5Na0.5Nb0.965Sb0.035O3-0.03Bi0.5-xErxNa0.5Zr0.8Sn0.2O3-0.015BaZrO3 (KNNS-xEr-BZ, x=0, 0.05, 0.1, 0.15, 0.2) doped with Er3+ was prepared via the conventional solid-state method. The Er3+ doping effects on the phase structure, microstructure, electrical properties, and optical temperature-sensing performances were investigated. It is found that the Er3+ doping can slightly reduce the piezoelectric constant d33 of the ceramics, maintaining >85% of the undoped ceramic. Meanwhile, mechanical quality factor ‌Qm increases from 34 to a maximal value of 54 as x increases from 0 to 0.15. Moreover, based on the thermal coupling effect of the 2H11/2 and 4S3/2 energy levels, the ceramics exhibit significant non-contact optical temperature-sensing characteristics over a broad temperature range of 173-773 K. Notably, the maximum absolute sensitivity (Sa) of KNNS-0.05Er-BZ is 0.0050 K-1, and its maximum relative sensitivity (Sr) is 4.02% K-1. The excellent piezoelectric and temperature-sensing performances of the prepared ceramics indicates its strong potential for applications in future multifunctional optoelectronic devices.

Keywords: KNN-based ceramics, Piezoelectric, Upconversion, Temperature sensing