Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440670 | Journal of the European Ceramic Society | 2017 | 8 Pages |
Abstract
Lead-free 0.94NBT-0.06BT-xLa ceramics at x = 0.0-1.0 (%) were synthesized by a conventional solid-state route. XRD shows that the compositions are at a morphotropic phase boundary where rhombohedral and tetragonal phases coexist. With increasing La3+ content pyroelectric coefficient (p) and figures of merits greatly increase; however, the depolarization temperature (Td) decreases. p is 7.24 Ã 10â4C mâ2 °Câ1 at RT at x = 0.5% and 105.4 Ã 10â4C.mâ2 °Câ1 at Td at x = 0.2%. Fi and Fv show improvements at RT from 1.12 (x = 0%) to 2.65 (x10 â10 m vâ1) (x = 0.5%) and from 0.021 to 0.048 (m2.Câ1) respectively. Fi and Fv show a huge increase to 37.6 Ã 10â10 m vâ1 and 0.56 m2 Câ1 respectively at Td at x = 0.2%. FC shows values of 2.10, 2.89, and 2.98 (x10â9C cmâ2 °Câ1) at RT at 33, 100 and 1000 (Hz) respectively. Giant pyroelectric properties make NBT-0.06BT-xLa at x = 0.2% and 0.5% promising materials for many pyroelectric applications.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
A.M. Balakt, C.P. Shaw, Qi Zhang,