Significant shear mode softening in a c-axis tilt nanostructured hexagonal thin film induced by a self-shadowing effect

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The mechanical properties of tilted AlN fiber structure caused by self-shadowing are investigated using gigahertz vibration induced through the piezoelectricity of AlN itself. We observed significant shear elastic softening in a highly tilted fiber nanostructure, but only a slight decrease in compressive elasticity. Abnormal 1/4 wavelength thickness mode resonance, indicating the decrease in the shear acoustic wave velocity, is reproducibly observed. We attribute this phenomenon to the weak fiber-to-fiber connection seen in a cross-sectional scanning electron microscopy image.

Original languageEnglish
Pages (from-to)724-727
Number of pages4
JournalScripta Materialia
Volume69
Issue number10
DOIs
Publication statusPublished - 2013 Nov
Externally publishedYes

Fingerprint

self shadowing
softening
shear
Thin films
fibers
Fibers
thin films
piezoelectricity
Piezoelectricity
Shear waves
Acoustic wave velocity
Elasticity
Nanostructures
elastic properties
mechanical properties
Wavelength
vibration
Mechanical properties
Scanning electron microscopy
scanning electron microscopy

Keywords

  • Acoustic methods
  • Nanocrystalline microstructure
  • Piezoelectricity
  • Shear mechanical properties
  • Sputtering

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Significant shear mode softening in a c-axis tilt nanostructured hexagonal thin film induced by a self-shadowing effect. / Yanagitani, Takahiko; Suzuki, M.

In: Scripta Materialia, Vol. 69, No. 10, 11.2013, p. 724-727.

Research output: Contribution to journalArticle

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