Donor Doping Effects on the Ferroelectric and the Piezoelectric Properties of Pb-Free (Bi0.5Na0.5)TiO3 Ceramics

Enhanced Ferroelectric and Dielectric Properties of Niobium-Doped Lead-Free Piezoceramics

“…The surface morphology showed that the relatively sharp corners in grains of non-doped BNT-ST26 ceramic converted to relatively round ones after Nb additions. Additionally, a particularly dense morphology with a more uniform surface was observed at higher Nb concentrations [ 19 , 21 ]. Hence, the increasing Nb concentration affected the grain size and to some extent the surface morphology.…”

“…Hence, the increasing Nb concentration affected the grain size and to some extent the surface morphology. The difference in the ionic radii of Ti +4 and Nb +5 , at 0.605 and 0.64 Å, respectively, may have influenced the variations in grain morphology and microstructure after doping [19,[21][22][23]. Another reason for these results may be because of the reaction between titanium (Ti) and niobium (Nb) that can suppress grain growth.…”

STUDY OF Bi0.5Na0.5TiO3 (BNT) SYSTEM DOPED WITH LANTHANUM (La3+) OBTAINED BY ACETIC ACID ROUTE IN SOL-GEL PROCESS

“…This could be due to the presence of structural defects in the material that can be attributed to a combination of porosity (from 90 to 95% with respect to the theoretical density) and deficiency of Bi. For this reason, it was proposed to carry out the high doping of lanthanum, in order to improve these results (Yeo H. et al, 2009 andJin L. et al, 2014). It is worth noting that the results obtained for the samples that were initially made with the formulation (A) that gave rise to BNT with deficiency of sodium (Na) and with the pyrochlore phase (BNT-Bi 2 Ti 2 O 7 ).…”

Growth and characterizations of lead-free ferroelectric KNN-based crystals

“…Owing to the increased focus on the research of environment friendly ferroelectric materials, there is an urge to replace lead-based ferroelectric and piezoelectric materials. (K 0.5 Na 0.5 )NbO 3 (KNN) is one of the promising materials with the possibility to replace Pb(Zr, Ti)O 3 (PZT) because of its good piezoelectric properties and high Curie temperature [1][2][3][4]. Various synthesis methods are focused in order to process the pure KNN materials in the form of ceramics.…”