Lead-free ferroelectric relaxor ceramics in the BaTiO3-BaZrO3-CaTiO3 system

1999 ◽  
Vol 9 (7) ◽  
pp. 1609-1613 ◽  
Author(s):  
Jean Ravez ◽  
Cédric Broustera ◽  
Annie Simon
Keyword(s):  
Lead Free ◽  
Ferroelectric Relaxor

scholarly journals Upper limit of the electrocaloric peak in lead-free ferroelectric relaxor ceramics

APL Materials ◽  
2016 ◽  
Vol 4 (6) ◽  
pp. 064104 ◽  
Author(s):  
Florian Le Goupil ◽  
Neil McN. Alford
Keyword(s):  
Lead Free ◽  
Ferroelectric Relaxor ◽  
Upper Limit

Enhanced Low-Field Strain in Bi-Based Lead-Free Ferroelectric-Relaxor Composites

2015 ◽  
Vol 487 (1) ◽  
pp. 142-148 ◽  
Author(s):  
Thi hinh Dinh ◽  
Chang-Ho Yoon ◽  
Jin-Kyu Kang ◽  
Young-Hwan Hong ◽  
Jae-Shin Lee
Keyword(s):  
Lead Free ◽  
Field Strain ◽  
Ferroelectric Relaxor ◽  
Low Field

Ferroelectric-relaxor crossover induce large electrocaloric effect with ultrawide temperature span in NaNbO3-based lead-free ceramics

2021 ◽  
Vol 118 (4) ◽  
pp. 043902
Author(s):  
Feng Li ◽  
Kai Li ◽  
Mingsheng Long ◽  
Chunchang Wang ◽  
Guohua Chen ◽  
...  
Keyword(s):  
Lead Free ◽  
Electrocaloric Effect ◽  
Ferroelectric Relaxor ◽  
Lead Free Ceramics

Large electrostrictive effect in Sn-doped NBT–BT lead-free relaxor ceramics

2020 ◽  
Vol 34 (11) ◽  
pp. 2050100
Author(s):  
W. P. Cao ◽  
J. Sheng ◽  
Z. Liu ◽  
C. Gao ◽  
Z. H. Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Room Temperature ◽  
Relaxor Ferroelectrics ◽  
Lead Free ◽  
Ferroelectric Relaxor ◽  
Pseudocubic Phase ◽  
Further Development ◽  
Electrostrictive Effect

In this work, we design and adjust the composition in [Formula: see text]–[Formula: see text] lead-free relaxor ferroelectrics by doping SnO2 to introduce a relaxor phase and accordingly obtain prominent lead-free electrostrictors. It was found that all the samples exhibited ideal features of relaxor ferroelectrics and the ferroelectric-relaxor phase transition temperature of the ceramics was adjusted to near or below room temperature after doping with a handful of [Formula: see text]. A relatively high electrostrictive coefficient [Formula: see text] of 0.0293 m4/C2 was achieved for the composition with [Formula: see text], which was attributed to the formation of relaxor pseudocubic phase developed by the [Formula: see text] substitution. These results provide some instructive thoughts for the further development of [Formula: see text]-based electrostrictive materials by B-site doping.

scholarly journals Nanoscale mapping of heterogeneity of the polarization reversal in lead-free relaxor–ferroelectric ceramic composites

Nanoscale ◽  
2016 ◽  
Vol 8 (4) ◽  
pp. 2168-2176 ◽  
Author(s):  
D. Gobeljic ◽  
V. V. Shvartsman ◽  
A. Belianinov ◽  
B. Okatan ◽  
S. Jesse ◽  
...  
Keyword(s):  
Piezoresponse Force Microscopy ◽  
Polarization Switching ◽  
Ferroelectric Ceramic ◽  
Ceramic Composites ◽  
Relaxor Ferroelectric ◽  
Lead Free ◽  
Polarization Reversal ◽  
Ferroelectric Relaxor ◽  
Force Microscopy

Heterogeneity of domain patterns and polarization switching in ferroelectric–relaxor ceramic composites were addressed using piezoresponse force microscopy.

scholarly journals Bismuth zinc niobate: BZN-BT, a new lead-free BaTiO3-based ferroelectric relaxor?

2020 ◽  
Vol 10 (06) ◽  
pp. 2050033
Author(s):  
Jessica Marshall ◽  
David Walker ◽  
Pam Thomas
Keyword(s):  
Dielectric Constant ◽  
Dielectric Relaxation ◽  
Dielectric Material ◽  
Ferroelectric Properties ◽  
High Capacity ◽  
Rapid Onset ◽  
Lead Free ◽  
Cubic Phase ◽  
The Novel ◽  
Ferroelectric Relaxor

The novel lead-free ferroelectric relaxor system [Formula: see text](Bi([Formula: see text] [Formula: see text][Formula: see text](1[Formula: see text]BaTiO3 ([Formula: see text]BZN(1[Formula: see text]BT) has received interest as a high-capacity relaxor dielectric material. Small quantities (< 10.0 mol.%) of BZN-based dopant had significant impacts on the structure of the BaTiO3 host. This study evaluates the effect of BZN additions to the BaTiO3 host up to [Formula: see text]BZN = 10.0%. Initial additions of BZN were observed to stabilize tetragonal and orthorhombic coexistence at 295 K, alongside increasing dielectric constant. Peak dielectric constant and polarization were observed at [Formula: see text] < 4.0%, coinciding with maximum orthorhombic intensity and a local minima in tetragonal intensity. Compositions 0 < [Formula: see text] < 4.0% showed increasing polarization and a drop in [Formula: see text] and classical ferroelectric properties. No significant dielectric dispersion was observed for compositions [Formula: see text] < 4.0% over the frequency range 5–640 kHz. Compositions at [Formula: see text] > 4.0% showed the onset of dielectric relaxation alongside a drop in polarization coincident with a drop in the tetragonal [Formula: see text]/[Formula: see text] ratio and the onset of the cubic phase at 295 K. Peak piezoelectric, dielectric and polarization values occurred over the range 3.8% < [Formula: see text] < 4.0%, alongside maximum orthorhombic intensity. Subsequent BZN additions showed a rapid onset of dielectric relaxation, alongside an increase in cubic intensity and a continuous drop in [Formula: see text] with a minima near [Formula: see text] = 7.0%. Tetragonal presence at 295 K also vanished to zero at [Formula: see text] = 7.0%. Polarization loops ceased showing ferroelectric characteristics at [Formula: see text] > 5.0%, showing a transition from lossy relaxor dielectric to low-loss relaxor dielectric at [Formula: see text] > 10.0%.

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