TY - JOUR
T1 - Effects of lanthanide ions on the structure and electrical properties of Aurivillius Bi3TiNbO9 high temperature piezoelectric ceramics
AU - Hou, Dingwei
AU - Fan, Huiqing
AU - Chen, Yanqin
AU - Jia, Yuxin
AU - Wang, Weijia
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/11/15
Y1 - 2022/11/15
N2 - Aurivillius Bi3TiNbO9 has a very high Curie temperature (Tc), but the piezoelectric coefficient (d33) is very low, and the influence of ions with different radii on its performance is not clear. High temperature piezoelectric ceramics Bi2.99(Li0.5Ln0.5)0.01TiNbO9 (BTNO-1LiLn, Ln = La, Nd, Gd, and Er) were prepared by solid state reaction sintering, and its microstructure, piezoelectric properties and electrical conductivity were systematically studied. The Tc of BTNO-1LiLn increases with the decrease of Ln3+ ions radii. BTNO-1LiEr obtains the highest d33 of 10.6 pC/N. Considering the cation disorder of A-site and bismuth layer of calcium titanium layer in Aurivilius structure, the crystal structures of BTNO-1LiLa with special occupation and BTNO-1LiEr with the best performance are refined, and the source of spontaneous polarization (Ps) is analyzed. It is proved that different occupation will have different effects on the high temperature piezoelectric properties and fatigue cycle properties of BTNO based ceramics. Finally, the band structure of BTNO pure ceramic based on the first principle is calculated. By comparing the activation energy and band gap width, it is indicated that (Li0.5Ln0.5)2+ ions entering BTNO will form impurity energy levels and form p-type semiconductors. This study provides a theoretical basis for better performance of BTNO based high temperature piezoelectric ceramics.
AB - Aurivillius Bi3TiNbO9 has a very high Curie temperature (Tc), but the piezoelectric coefficient (d33) is very low, and the influence of ions with different radii on its performance is not clear. High temperature piezoelectric ceramics Bi2.99(Li0.5Ln0.5)0.01TiNbO9 (BTNO-1LiLn, Ln = La, Nd, Gd, and Er) were prepared by solid state reaction sintering, and its microstructure, piezoelectric properties and electrical conductivity were systematically studied. The Tc of BTNO-1LiLn increases with the decrease of Ln3+ ions radii. BTNO-1LiEr obtains the highest d33 of 10.6 pC/N. Considering the cation disorder of A-site and bismuth layer of calcium titanium layer in Aurivilius structure, the crystal structures of BTNO-1LiLa with special occupation and BTNO-1LiEr with the best performance are refined, and the source of spontaneous polarization (Ps) is analyzed. It is proved that different occupation will have different effects on the high temperature piezoelectric properties and fatigue cycle properties of BTNO based ceramics. Finally, the band structure of BTNO pure ceramic based on the first principle is calculated. By comparing the activation energy and band gap width, it is indicated that (Li0.5Ln0.5)2+ ions entering BTNO will form impurity energy levels and form p-type semiconductors. This study provides a theoretical basis for better performance of BTNO based high temperature piezoelectric ceramics.
KW - Band structure
KW - Bismuth layer structured ferroelectrics
KW - Lanthanide ions
KW - Rietveld refinement
UR - http://www.scopus.com/inward/record.url?scp=85133932550&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2022.166065
DO - 10.1016/j.jallcom.2022.166065
M3 - 文章
AN - SCOPUS:85133932550
SN - 0925-8388
VL - 921
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 166065
ER -