Processing, phase evolution and electrical properties of “lead free” KNN–BF–CuO eco-piezoceramic from mechanochemically activated precursors

Open Ceramics

Sebastiano Garroni¹  Lorena Pardo²  Álvaro García³  Antonio Iacomini³  Gabriele Mulas³  Luca Cappai³  Stefano Enzo³  Costantino Cau³  Marzia Mureddu³ 

[1] Corresponding author.;Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Cientificas (CSIC), c/ Sor Juana Inés de la Cruz, 3. Cantoblanco, 28049, Madrid, Spain;Università degli Studi di Sassari, Dipartimento di Chimica e Farmacia, via Vienna 2, 07100, Sassari, Italy;

关键词: Lead free piezoceramics;    Ceramic processing;    Sintering aid;    Sodium potassium niobate;    Bismuth ferrite;    Mechanochemical activation;   

DOI  :  

来源: DOAJ

【 摘 要 】

“Lead free” piezoceramics 0.99K0.5Na0.5NbO3-0.01BiFeO3 (KNN–BF) with increasing amount of CuO (0, 0.5, 1 wt.%) were prepared through a scalable combination of High Energy Ball Milling, calcination at 900 °C and air sintering. The effect of CuO on the sintering behaviour and electrical properties of KNN–BF was investigated. The compositions examined show high-density values (>95% of TD) at their optimized sintering temperatures. Small addition of CuO (0.5 wt.%) causes an increase in the size of grains, however an excess of CuO (1 wt.%) inhibits the growth of grains due to the excess of liquid phase. The KNN–BF composition shows promising electrical properties (d33 = 150 pC/N; kp = 42%; Qm = 150) which are mainly related to the high density achieved and to the orthorhombic-tetragonal symmetry coexistence. The addition of 0.5 wt.% of CuO causes an increase in the quality factors (Qm = 235; Q(d31) = 207).

【 授权许可】

Unknown