Pyrochlore‐Free Ferroelectric 0.64Pb(Ni_1/3Nb_2/3)O₃–0.36PbTiO₃ Ceramics Synthesized by the Combustion Method

Abstract

By adopting Nb 2 O 5 , HNO 3 and coordination agents EDTA as raw materials, pyrochlore-free 0.64Pb(Ni 1/3 Nb 2/3 )O 3 -0.36PbTiO 3 (0.64PNN-0.36PT) powders were successfully synthesized via a combustion route. Free of pyrochlore phase was realized by the chelation formation of EDTA-metal ions which isolate niobium and lead oxides and then prevent the formation of pyrochlore phases, therein generate the desired perovskite phases. Comparing the results with similar samples synthesized by the Columbite method, the new 0.64PNN-0.36PT ceramics here shown much better dielectric and ferroelectric performances: a maximum dielectric constant of 22 856 at 1 kHz and a remnant polarization of 21.6 lC/cm 2 at 40 kV/cm. X. M. Chen-contributing editor Manuscript No. 34074.

Systematic study of structure and piezoelectric properties of Pb(Ni1/3Nb2/3)O3‐PbTiO3 by in situ synchrotron diffraction

“…Therefore, its piezoelectric and dielectric properties have been extensively investigated. [6][7][8][14][15][16][17][18] For example, Pan et al used the columbite method to synthesize PNN-PT with high d 33 (450 pC/N) around the morphotropic phase boundary (MPB). 16 Wang et al reported the dielectric properties of 0.64PNN-0.36PT ceramics, which were prepared via combustion route.…”

“…16 Wang et al reported the dielectric properties of 0.64PNN-0.36PT ceramics, which were prepared via combustion route. 17 Piezoelectric materials at the MPB are generally known to exhibit excellent piezoelectric response. It is commonly considered that in traditional lead-based piezoelectric ceramics, the boundary of rhombohedral (R) and tetragonal (T) phases is located in the MPB, where the free energy difference between R and T phases is small, thus facilitating the alignment of domains under electric field.…”

“…PNN‐PT is widely used to enhance the piezoelectric properties in polynary systems. Therefore, its piezoelectric and dielectric properties have been extensively investigated 6‐8,14‐18 . For example, Pan et al used the columbite method to synthesize PNN‐PT with high d 33 (450 pC/N) around the morphotropic phase boundary (MPB) 16 .…”

“…For example, Pan et al used the columbite method to synthesize PNN‐PT with high d 33 (450 pC/N) around the morphotropic phase boundary (MPB) 16 . Wang et al reported the dielectric properties of 0.64PNN‐0.36PT ceramics, which were prepared via combustion route 17 …”

High Piezoelectric Performance in Pb(Ni1/3Nb2/3)O3–Pb(Sc1/2Nb1/2)O3–PbTiO3 Ternary System Featuring Small Structural Distortion and Heterogeneous Domain Configuration

“…Among these materials, special attention has been paid to perovskite-type ferroelectrics with a high piezoelectric coefficient ( d 33 ) and electromechanical coupling coefficient ( k p ) . In particular, lead-based piezoelectric ceramics such as Pb­(Zr,Ti)­O 3 − and relaxor ferroelectrics represented by Pb­(Mg 1/3 Nb 2/3 )­O 3 –PbTiO 3 (PMN-PT), − Pb­(Ni 1/3 Nb 2/3 )­O 3 –PbTiO 3 (PNN-PT), − and Pb­(Sc 1/2 Nb 1/2 )­O 3 –PbTiO 3 (PSN-PT) − are the most common binary systems with a perovskite structure. However, these classic systems fail to meet the increasing demand for the high piezoelectric performance in modern electronic devices.…”