Geometrical frustration and piezoelectric response in oxide ferroics
Abstract
Materials with increased functionality are often based on crystalline structures with significant local disorder. Typical examples are ferroic oxides exhibiting large spontaneous polarization that can be rotated by an applied electric field, finding use in many important applications. Despite years of investigation, the exact structural origin of the increased piezoelectric response of oxide ferroics is still unclear. Frequently evoked models attribute it to emerging polar nanoregions inside a nonpolar matrix, the existence of a morphotropic boundary separating polar phases with different crystallographic symmetry, low-symmetry bridging phases facilitating polarization rotation, and displacive and order-disorder structural phase transitions. Here we use both conventional and resonant high-energy x-ray diffraction coupled to atomic pair distribution function analysis and three-dimensional computer simulations to examine the relationship between the local structure and piezoelectric properties of exemplary sodium-potassium niobate ferroics. We show that their increased piezoelectric response is primarily due to a geometrical frustration in the underlying perovskite lattice induced by local fluctuations in the tilt pattern of the constituent niobium-oxygen octahedra, and not to a crystal-crystal phase transition or distinct nanodomains. The fluctuations peak when the sodium to potassium ratio approaches 1, leading to a softening of the perovskite lattice and easing of polarization rotation undermore »
- Authors:
-
- Central Michigan Univ., Mount Pleasant, MI (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Virginia Tech India Center for Advanced Research and Education, Chennai, Tamil Nadu (India)
- Pennsylvania State Univ., University Park, PA (United States)
- Publication Date:
- Research Org.:
- Central Michigan Univ., Mount Pleasant, MI (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1594599
- Alternate Identifier(s):
- OSTI ID: 1582580
- Grant/Contract Number:
- SC0006877; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Ferroelectricity; crystal structures; resonant high-energy XRD
Citation Formats
Petkov, Valeri, Kim, Jong-Woo, Shastri, Sarvjit, Gupta, Shashaank, and Priya, Shashank. Geometrical frustration and piezoelectric response in oxide ferroics. United States: N. p., 2020.
Web. doi:10.1103/PhysRevMaterials.4.014405.
Petkov, Valeri, Kim, Jong-Woo, Shastri, Sarvjit, Gupta, Shashaank, & Priya, Shashank. Geometrical frustration and piezoelectric response in oxide ferroics. United States. https://doi.org/10.1103/PhysRevMaterials.4.014405
Petkov, Valeri, Kim, Jong-Woo, Shastri, Sarvjit, Gupta, Shashaank, and Priya, Shashank. Mon .
"Geometrical frustration and piezoelectric response in oxide ferroics". United States. https://doi.org/10.1103/PhysRevMaterials.4.014405. https://www.osti.gov/servlets/purl/1594599.
@article{osti_1594599,
title = {Geometrical frustration and piezoelectric response in oxide ferroics},
author = {Petkov, Valeri and Kim, Jong-Woo and Shastri, Sarvjit and Gupta, Shashaank and Priya, Shashank},
abstractNote = {Materials with increased functionality are often based on crystalline structures with significant local disorder. Typical examples are ferroic oxides exhibiting large spontaneous polarization that can be rotated by an applied electric field, finding use in many important applications. Despite years of investigation, the exact structural origin of the increased piezoelectric response of oxide ferroics is still unclear. Frequently evoked models attribute it to emerging polar nanoregions inside a nonpolar matrix, the existence of a morphotropic boundary separating polar phases with different crystallographic symmetry, low-symmetry bridging phases facilitating polarization rotation, and displacive and order-disorder structural phase transitions. Here we use both conventional and resonant high-energy x-ray diffraction coupled to atomic pair distribution function analysis and three-dimensional computer simulations to examine the relationship between the local structure and piezoelectric properties of exemplary sodium-potassium niobate ferroics. We show that their increased piezoelectric response is primarily due to a geometrical frustration in the underlying perovskite lattice induced by local fluctuations in the tilt pattern of the constituent niobium-oxygen octahedra, and not to a crystal-crystal phase transition or distinct nanodomains. The fluctuations peak when the sodium to potassium ratio approaches 1, leading to a softening of the perovskite lattice and easing of polarization rotation under an electric field. Based on the experimental data and model calculations involving Goldschmidt's tolerance factor for the stability of perovskites, we also show that the fluctuations are driven by the mismatch between the radii of sodium and potassium atoms, and the increased piezoelectric response of sodium-potassium niobates indeed scales with the variance in the distribution of these radii about the average value. Thus, we settle important aspects of the debate over the structure-piezoelectric property relationship for oxide ferroics, thereby providing a different perspective on the ongoing effort to improve their useful properties.},
doi = {10.1103/PhysRevMaterials.4.014405},
journal = {Physical Review Materials},
number = 1,
volume = 4,
place = {United States},
year = {Mon Jan 13 00:00:00 EST 2020},
month = {Mon Jan 13 00:00:00 EST 2020}
}
Web of Science
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