Effect of substitution of titanium by magnesium and niobium on structure and piezoelectric properties in (Bi1/2Na1/2)TiO3 ceramics

Abstract

To develop new (Bi 1/2 Na 1/2 )TiO 3 -based ceramics with excellent piezoelectric properties, the similarities and the differences between PZT and (Bi 1/2 Na 1/2 )TiO 3 ceramics were analysed. Based on the analysis, a new (Bi 1/2 Na 1/2 )TiO 3 -based piezoelectric ceramic of B-site substitution of complex ions (Mg 1/3 Nb 2/3 ) 4+ for Ti 4+ was prepared by a conventional ceramic technique, and effect of complex ions (Mg 1/3 Nb 2/3 ) 4+ addition on the microstructure, dielectric and piezoelectric properties was investigated. The results show that all compositions are mono-perovskite phase and the grain size increases with increasing content of (Mg 1/3 Nb 2/3 ) 4+ . The piezoelectric constant, d 33 , first increases and then decreases, and electromechanical coupling factor, k p , varies insignificantly with increasing content of (Mg 1/3 Nb 2/3 ) 4+ .

Significant photostrictive response in lead‐free Bi0.5Na0.5TiO3 ceramics under visible light illumination

“…Bi 0.5 Na 0.5 TiO 3 (abbreviated as BNT) family is one of the major lead-free ferroelectrics which have been comprehensively investigated toward piezoelectric application. [14][15][16] Recently, the optical properties and the photoelectric performance of BNT-based ceramics were observed successively. [17][18][19][20][21] BNT-based ceramics show a large open-circuit photovoltage ~65 V under 365 nm ultraviolet (UV) illumination.…”

Electromechanical Properties and Microstructure of Undoped K_0.5Na_0.5NbO₃ Ceramics and KNbO₃-NaNbO₃ Crystals

“…In order to overcome it, many studies have been focused on lead-free materials such as alkali niobate family (KNbO3-KN and K0.5Na0.5NbO3-KNN) or (Bi,Na)TiO3-BNT family and their derivatives compounds [2][3][4]. In the literature, some authors have found that these compounds exhibited excellent piezoelectric properties when they are textured or in crystal form compared to their ceramic counterparts [5].…”

Electrical and microstructural properties of CaTiO 3 -doped K 1/2 Na 1/2 NbO 3 -lead free ceramics

“…A number of researches on lead-free piezoelectric ceramics such as alkaline niobiate (Saito et al 2004;Matsubara et al 2005), BaTiO 3 -based (Yu et al 2002), Bi-layered (Sawada et al 2003), bismuth sodium titanate (Zhou and Xin 2007;Zhou et al 2009) and tungsten bronze-type materials (Suzuki et al 2003) have been recently published. In this way, niobates (K,Na)NbO 3 (KNN)-based ceramics have showed good piezoelectric and electric properties, high Curie temperature and environmental innocuity (Maeder et al 2004;Wang et al 2004;Alkoy and Papila 2010).…”