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Title: Phase transitions and octahedral rotations in epitaxial Ag(Ta xNb 1-x)O 3 thin films under tensile strain

In this paper, epitaxial Ag(Ta 0.5Nb 0.5)O 3 (ATN) films under tensile strain were deposited on (Ba 0.4Sr 0.6)TiO 3/LaAlO 3 (001) p and KTaO 3 (001) substrates. These films exhibited a domain structure with the c-axis aligned primarily along the in-plane direction in contrast with the poly-domain nature of bulk ATN ceramics or relaxed films. While the generic phase transition sequence of the tensile films was qualitatively similar to bulk, the tetragonal and orthorhombic phase field regions expanded by ~270 °C in ATN/(Ba 0.4Sr 0.6)TiO 3/LaAlO 3. Furthermore, the films were found to be in the M 3 (complex octahedral tilting with disordered Nb/Ta displacements) phase at room temperature with either significantly reduced tilt angles or a suppression of the long range order of the complex tilt as compared to bulk materials. It was observed that the octahedral tilt domains were oriented with the complex tilt axes lying in the plane of the film due to the tensile strain. Finally, this work demonstrates that tensile strain can be used to strain-engineer materials with complex tilt systems and thereby modify functional properties.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Materials Research Inst. Materials Science and Engineering Dept.
  2. Univ. of Sheffield (United Kingdom). Dept. of Engineering Materials
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Materials Measurement Science Division
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Publication Date:
Grant/Contract Number:
AC02-06CH11357; DMR-0602770; DMR-0820404; DMR-0908718
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 8; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Pennsylvania State Univ., University Park, PA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Contributing Orgs:
Univ. of Sheffield (United Kingdom); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Thin film structure; Niobium; Superlattices; Materials properties; Phase transitions
OSTI Identifier:
1356997
Alternate Identifier(s):
OSTI ID: 1228557