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Title: Large polarization gradients and temperature-stable responses in compositionally-graded ferroelectrics

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms14961· OSTI ID:1379845
ORCiD logo [1];  [1];  [2];  [1]; ORCiD logo [3];  [4];  [1]; ORCiD logo [5];  [5];  [1];  [1];  [1];  [6];  [4]; ORCiD logo [2]; ORCiD logo [7]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
  2. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemistry
  3. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemistry; Carnegie Inst. for Science, Washington, DC (United States). Geophysical Lab.
  4. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Center for Electron Microscopy
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Center for Electron Microscopy
  6. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
  7. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division

A range of modern applications require large and tunable dielectric, piezoelectric or pyroelectric response of ferroelectrics. Such effects are intimately connected to the nature of polarization and how it responds to externally applied stimuli. Ferroelectric susceptibilities are, in general, strongly temperature dependent, diminishing rapidly as one transitions away from the ferroelectric phase transition (TC). In turn, researchers seek new routes to manipulate polarization to simultaneously enhance susceptibilities and broaden operational temperature ranges. Here, we demonstrate such a capability by creating composition and strain gradients in Ba1-xSrxTiO3 films which result in spatial polarization gradients as large as 35 μC cm-2 across a 150 nm thick film. These polarization gradients allow for large dielectric permittivity with low loss (εr≈775, tan δ<0.05), negligible temperature-dependence (13% deviation over 500 °C) and high-dielectric tunability (greater than 70% across a 300 °C range). The role of space charges in stabilizing polarization gradients is also discussed.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231; SC0012375; CMMI-1334241; DMR-1451219; CMMI-1434147; DMR-1608938
OSTI ID:
1379845
Journal Information:
Nature Communications, Vol. 8; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 57 works
Citation information provided by
Web of Science

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Cited By (10)

Terahertz field–induced ferroelectricity in quantum paraelectric SrTiO 3 journal June 2019
Pulsed laser deposition with rapid beam deflection by a galvanometer mirror scanner journal September 2019
Strain-Gradient-Controlled Disorder Dynamics in Chemically Substituted Ferroelectrics journal February 2019
Dielectric properties and resistive switching characteristics of lead zirconate titanate/hafnia heterostructures journal August 2018
The enhanced piezoelectricity in compositionally graded ferroelectric thin films under electric field: A role of flexoelectric effect journal February 2018
Sr-induced dipole scatter in Ba x Sr 1 x TiO 3 : Insights from a transferable-bond valence-based interatomic potential journal November 2019
Formation of polarization needle-like domain and its unusual switching in compositionally graded ferroelectric thin films: an improved phase field model journal January 2019
Understanding the Role of Ferroelastic Domains on the Pyroelectric and Electrocaloric Effects in Ferroelectric Thin Films journal December 2018
Flexoelectricity in ferroelectric materials journal September 2019
Temperature-independent giant dielectric response in transitional BaTiO 3 thin films journal March 2020

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