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Induced ferroelectric phases in SrTiO3 by a nanocomposite approach

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/d0nr03460f· OSTI ID:1699468
 [1];  [2];  [3];  [4];  [5];  [5];  [5];  [3];  [3];  [3];  [6];  [7];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT) and Inst. for Materials Science
  2. Tsinghua Univ., Beijing (China). School of Materials Science and Engineering
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Purdue Univ., West Lafayette, IN (United States). School of Materials Engineering
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
  7. Univ. at Buffalo, NY (United States). Dept. of Materials Design and Innovation
+ Show Author Affiliations

Inducing new phases in thick films via vertical lattice strain is one of the critical advantages of vertically aligned nanocomposites (VANs). In SrTiO3 (STO), the ground state is ferroelastic, and the ferroelectricity in STO is suppressed by the orthorhombic transition. In this study, we explore whether vertical lattice strain in three-dimensional VANs can be used to induce new ferroelectric phases in SrTiO3:MgO (STO:MgO) VAN thin films. The STO:MgO system incorporates ordered, vertically aligned MgO nanopillars into a STO film matrix. Strong lattice coupling between STO and MgO imposes a large lattice strain in the STO film. We have investigated ferroelectricity in the STO phase, existing up to room temperature, using piezoresponse force microscopy, phase field simulation and second harmonic generation. We also serendipitously discovered the formation of metastable TiO nanocores in MgO nanopillars embedded in the STO film matrix. Our results emphasize the design of new phases via vertical epitaxial strain in VAN thin films.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
89233218CNA000001; NA0003525; AC04-94AL85000
OSTI ID:
1699468
Alternate ID(s):
OSTI ID: 1721616
OSTI ID: 1651218
Report Number(s):
LA-UR--20-24150
Journal Information:
Nanoscale, Journal Name: Nanoscale Journal Issue: 35 Vol. 12; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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