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Title: Resolving structural contributions to the electric-field-induced strain in lead-free (1 ;#8722; x)Ba(Zr[subscript 0.2]Ti[subscript 0.8])O[subscript 3] ;#8722; x(Ba[subscript 0.7]Ca[subscript 0.3])TiO[subscript 3] piezoceramics

Authors:
; ; ; ;  [1];  [2];  [2]
  1. IIT
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGNNSFDOE - BASIC ENERGY SCIENCES
OSTI Identifier:
1121468
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Materialia; Journal Volume: 66
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Ehmke, Matthias C., Khansur, Neamul H., Daniels, John E., Blendell, John E., Bowman, Keith J., Purdue), and New South). Resolving structural contributions to the electric-field-induced strain in lead-free (1 ;#8722; x)Ba(Zr[subscript 0.2]Ti[subscript 0.8])O[subscript 3] ;#8722; x(Ba[subscript 0.7]Ca[subscript 0.3])TiO[subscript 3] piezoceramics. United States: N. p., 2014. Web. doi:10.1016/j.actamat.2013.11.021.
Ehmke, Matthias C., Khansur, Neamul H., Daniels, John E., Blendell, John E., Bowman, Keith J., Purdue), & New South). Resolving structural contributions to the electric-field-induced strain in lead-free (1 ;#8722; x)Ba(Zr[subscript 0.2]Ti[subscript 0.8])O[subscript 3] ;#8722; x(Ba[subscript 0.7]Ca[subscript 0.3])TiO[subscript 3] piezoceramics. United States. doi:10.1016/j.actamat.2013.11.021.
Ehmke, Matthias C., Khansur, Neamul H., Daniels, John E., Blendell, John E., Bowman, Keith J., Purdue), and New South). Wed . "Resolving structural contributions to the electric-field-induced strain in lead-free (1 ;#8722; x)Ba(Zr[subscript 0.2]Ti[subscript 0.8])O[subscript 3] ;#8722; x(Ba[subscript 0.7]Ca[subscript 0.3])TiO[subscript 3] piezoceramics". United States. doi:10.1016/j.actamat.2013.11.021.
@article{osti_1121468,
title = {Resolving structural contributions to the electric-field-induced strain in lead-free (1 ;#8722; x)Ba(Zr[subscript 0.2]Ti[subscript 0.8])O[subscript 3] ;#8722; x(Ba[subscript 0.7]Ca[subscript 0.3])TiO[subscript 3] piezoceramics},
author = {Ehmke, Matthias C. and Khansur, Neamul H. and Daniels, John E. and Blendell, John E. and Bowman, Keith J. and Purdue) and New South)},
abstractNote = {},
doi = {10.1016/j.actamat.2013.11.021},
journal = {Acta Materialia},
number = ,
volume = 66,
place = {United States},
year = {Wed Aug 06 00:00:00 EDT 2014},
month = {Wed Aug 06 00:00:00 EDT 2014}
}
  • The piezoelectric compositions (1 - x)Ba(Zr 0.2Ti 0.8)O 3–x(Ba 0.7Ca 0.3)TiO 3 (BZT-xBCT) span a model lead-free morphotropic phase boundary (MPB) between room temperature rhombohedral and tetragonal phases at approximately x = 0.5. In the present work, in situ X-ray diffraction measurements during electric field application are used to elucidate the origin of electromechanical strain in several compositions spanning the tetragonal compositional range 0.6 ≤ x ≤ 0.9. As BCT concentration decreases towards the MPB, the tetragonal distortion (given by c/a-1) decreases concomitantly with an increase in 90° domain wall motion. The increase in observed macroscopic strain is predominantly attributedmore » to the increased contribution from 90° domain wall motion. The results demonstrate that domain wall motion is a significant factor in achieving high strain and piezoelectric coefficients in lead-free polycrystalline piezoelectrics.« less
  • The piezoelectric compositions (1 − x)Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}–x(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} (BZT-xBCT) span a model lead-free morphotropic phase boundary (MPB) between room temperature rhombohedral and tetragonal phases at approximately x = 0.5. In the present work, in situ X-ray diffraction measurements during electric field application are used to elucidate the origin of electromechanical strain in several compositions spanning the tetragonal compositional range 0.6 ≤ x ≤ 0.9. As BCT concentration decreases towards the MPB, the tetragonal distortion (given by c/a-1) decreases concomitantly with an increase in 90° domain wall motion. The increase in observed macroscopic strain is predominantly attributed to the increased contribution from 90°more » domain wall motion. The results demonstrate that domain wall motion is a significant factor in achieving high strain and piezoelectric coefficients in lead-free polycrystalline piezoelectrics.« less
  • Hierarchical micro- and nanoscale domain structures in Pb-free Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-50(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} piezoceramics were investigated by transmission electron microscopy. In situ heating and cooling studies of domain structure evolution reveal an irreversible domain transformation from a wedge-shaped rhombohedral nanodomain structure to a lamellar tetragonal domain structure, which could be associated with strong piezoelectricity in Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-50(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} piezoceramics.
  • In this work, the lead-free Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-0.3(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} piezoelectric ceramic was investigated in situ under an applied electric field by transmission electron microscopy. Significant changes in domain morphology of the studied material have been observed under an applied electric field. During the poling process, the domain configurations disappeared, forming a single-domain state. This multi- to single-domain state transition occurred with the formation of an intermediate nanodomain state. After removing the electric field, domain configurations reappeared. Selected area electron diffraction during electrical poling gave no indication of any structural changes as for example reflection splitting. Rather, amore » contribution of the extrinsic effect to the piezoelectric response of the Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-0.3(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} was found to be dominant.« less
  • In this paper, two displacive phase transitions around the morphotropic phase boundary (MPB) in Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-x(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} (BZT-xBCT) ceramics were detected by inspecting two anomalies of the Raman Ti{sup 4+}-O{sup 2−} longitudinal optical mode (∼725 cm{sup −1}). Further, permittivity and X-ray diffraction results demonstrated these two phase transitions originate from tetragonal (T) to rhombohedral (R) through an intermediate orthorhombic (O) phase. Importantly, we found that the maximum piezoelectric response (d{sub 33} = 545pC/N) was achieved at the boundary between the T and O phase, indicating that the giant piezoelectricity of BZT-xBCT may mainly stem from the T-O phase boundarymore » due to easier polarization rotation and larger lattice softening.« less