Structural and Electric Properties of MnO2-Doped KNN-LT Lead-Free Piezoelectric Ceramics

Structural, ferroelectric, dielectric, and piezoelectric properties of K0.5Na0.5NbO3-LiTaO3-xmol%MnO2lead-free piezoelectric ceramics with 0.0 ≤x≤ 0.3 were studied. The ceramic samples were synthesized through the conventional solid-state reaction method. The MnO2addition can reduce the sintering temperature of KNLNT ceramics. Compared with undoped KNLNT ceramic, the piezoelectric measurements showed that piezoelectric properties of K0.5Na0.5NbO3-LiTaO3-xMnO2were improved (d33= 251 pC/N) whenx= 0.1. In addition, KNLNT-xMnO2ceramics have largerPr(20.59~21.97 μC/cm2) and smallerEc(10.77~6.95 kV/cm), which indicates MnO2has excellent softening property, which improves the ferroelectric properties of KNLNT ceramics This work adds relevant information regarding of potassium sodium niobate K0.5Na0.5NbO3(KNN) when doped Li, Ta, Mn at the B-site.Keywords:KNLNT ceramics;MnO2doped;ferroelectricity;piezoelectricity