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Title: Polar state in freestanding strontium titanate nanoparticles

Monodispersed strontium titanate nanoparticles were prepared and studied in detail. It is found that ∼10 nm as-prepared stoichiometric nanoparticles are in a polar structural state (possibly with ferroelectric properties) over a broad temperature range. A tetragonal structure, with possible reduction of the electronic hybridization, is found as the particle size is reduced. In the 10 nm particles, no change in the local Ti-off centering is seen between 20 and 300 K. The results indicate that nanoscale motifs of SrTiO{sub 3} may be utilized in data storage as assembled nano-particle arrays in applications where chemical stability, temperature stability, and low toxicity are critical issues.
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4] ; ;  [5] ;  [3] ;  [6]
  1. Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102 (United States)
  2. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 (United States)
  3. Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794 (United States)
  4. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  5. Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
  6. (United States)
Publication Date:
OSTI Identifier:
22311013
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; FERROELECTRIC MATERIALS; NANOPARTICLES; NANOSTRUCTURES; PARTICLE SIZE; STABILITY; STOICHIOMETRY; STRONTIUM TITANATES; TOXICITY