Characterization of La-Doped PBN Ferroelectric Ceramics

Abstract

In this work, pure and La 3+ -doped PBN56 ceramics (La 3+ added from 0 wt% to 4 wt%) were fabricated and studied concerning its structure, microstructure and dielectric properties. The analysis of the microstructure of the ceramics showed a change of the grain morphology for ceramics with La content higher than 1.0 wt%. X-ray diffraction and Raman spectroscopy were performed to study the structure of the PBN56 ceramics. The results showed the presence of an orthorhombic phase, whose concentration is increased with the increasing of the La 3+ content. The analysis of the results was performed to investigate the presence of the orthorhombic phase and the composition where its formation begins.

Dielectric and piezoelectric properties of cerium-modified lead barium niobate ceramics

“…La 3+ -modified PBN ferroelectric ceramics were characterized for microstructure and dielectric properties. The microstructural analysis exhibited a change in the grain morphology and the results confirmed the presence of orthorhombic phase, and increasing La 3+ enhanced the orthorhombicity [9]. Phase evaluation and densification behaviour of PBN ceramics at (1 − x) = 0.7, 0.6 and 0.5 have been reported by Carmo et al [10].…”

“…It is well known that the larger tolerance factor and electronegativity difference are in favour of stabilizing the tungsten bronze phase [22]. As Ce concentration increased from undoped to 6 mol% in PBN, the lattice parameters a and c increased up to 6 mol% and further increment of Ce [9]. The theoretical density and experimental density of Cemodified lead barium niobate ceramics is represented in Fig.…”

Effects of the doping of W6+ ions on the structure and electrical properties of Pb0.95Ba0.05Nb2O6 piezoelectric ceramics

“…The doping of La 3 þ ions can modify the morphology of grains and Curie temperature of the PN-based ceramics [7]. The Ca 2 þ , Mn 4 þ and Ti 4 þ ions were also found to facilitate the densification of the PN-based ceramics [8][9][10].…”

Microstructure, dielectric and piezoelectric properties of (Pb1−xSrx)Nb1.96Ti0.05O6 ceramics

“…Venet et al found that the incorporation of La 3þ into the PN-based ceramics can change morphology of grains and Curie temperature [5]. The adding of Mn 4þ and Ca 2þ is also in favor of fabricating dense PN-based ceramics with good piezoelectric properties [6].…”