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Title: Very high commutation quality factor and dielectric tunability in nanocomposite SrTiO 3 thin films with T c enhanced to >300 °C

We report on nanoengineered SrTiO 3–Sm2O 3 nanocomposite thin films with the highest reported values of commutation quality factor (CQF or K-factor) of >2800 in SrTiO 3 at room temperature. The films also had a large tunability of dielectric constant (49%), low tangent loss (tan δ = 0.01) and a Curie temperature for SrTiO 3 > 300 °C, making them very attractive for tunable RF applications. The enhanced properties originate from the unique nanostructure in the films, with <20 nm diameter strain-controlling Sm 2O 3 nanocolumns embedded in a SrTiO 3 matrix. Very large out-of-plane strains (up to 2.6%) and high tetragonality (c/a) (up to 1.013) were induced in the SrTiO 3. Finally, the K-factor was further enhanced by adding 1 at% Sc 3+ (acceptor) dopant in SrTiO 3 to a value of 3300 with the tangent loss being ≤0.01 up to 1000 kV cm -1.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ; ORCiD logo [3] ;  [4] ; ORCiD logo [5] ;  [1]
  1. Univ. of Cambridge (United Kingdom). Dept. of Materials Science and Metallurgy
  2. Univ. Malaysia Terengganu, Terengganu (Malaysia). School of Fundamental Science
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Purdue Univ., West Lafayette, IN (United States). School of Materials Engineering
Publication Date:
Report Number(s):
BNL-203593-2018-JAAM; LA-UR-17-23232
Journal ID: ISSN 2040-3364; NANOHL
Grant/Contract Number:
SC0012704; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 10; Journal Issue: 7; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Material Science
OSTI Identifier:
1436254
Alternate Identifier(s):
OSTI ID: 1467201