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Title: Determination of elastic properties of a MnO{sub 2} coating by surface acoustic wave velocity dispersion analysis

MnO{sub 2} is a material of interest in the development of high energy-density batteries, specifically as a coating material for internal 3D structures, thus ensuring rapid energy deployment. Its electrochemical properties have been mapped extensively, but there are, to the best of the authors' knowledge, no records of the elastic properties of thin film MnO{sub 2}. Impulsive stimulated thermal scattering (ISTS), also known as the heterodyne diffraction or transient grating technique, was used to determine the Young's modulus (E) and porosity (ψ) of a 500 nm thick MnO{sub 2} coating on a Si(001) substrate. ISTS is an all optical method that is able to excite and detect surface acoustic waves (SAWs) on opaque samples. From the measured SAW velocity dispersion, the Young's modulus and porosity were determined to be E = 25 ± 1 GPa and ψ=42±1%, respectively. These values were confirmed by independent techniques and determined by a most-squares analysis of the carefully fitted SAW velocity dispersion. This study demonstrates the ability of the presented technique to determine the elastic parameters of a thin, porous film on an anisotropic substrate.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [2]
  1. Laboratory for Acoustics and Thermal Physics, KU Leuven, University of Leuven, Celestijnenlaan 200D, B-3001 Heverlee (Belgium)
  2. IMEC, Kapeldreef 75, B-3001 Leuven (Belgium)
  3. (Belgium)
Publication Date:
OSTI Identifier:
22308965
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; DIFFRACTION; DISPERSIONS; ELASTICITY; ELECTROCHEMISTRY; ENERGY DENSITY; MANGANESE OXIDES; POROSITY; POROUS MATERIALS; PRESSURE RANGE GIGA PA; SOUND WAVES; SUBSTRATES; SURFACE COATING; SURFACES; THIN FILMS; TRANSIENTS