Elastic relaxations associated with the Pm̄3m-R̄3c transition in LaAlO3: I. Single crystal elastic moduli at room temperature

M. A. Carpenter, S. V. Sinogeikin, J. D. Bass, D. L. Lakshtanov, S. D. Jacobsen

Research output: Contribution to journalArticle

Abstract

Values for all six independent components of the ̄3m elastic modulus tensor of LaAlO3 perovskite are reported. These were determined by means of Brillouin scattering measurements of acoustic velocities in single crystal plates cut parallel to (110) and (100), as defined with respect to the cubic parent structure, and by pure-mode longitudinal and transverse sound velocity measurements along [100], [110] and [111] directions using GHz pulse-echo ultrasonics. The crystals contained intimate intergrowths of twins arising from the Pm̄3m→R̄3c transition at higher temperature but, in combination with a careful analysis of twin orientation relationships, the two sets of data have allowed a unique solution to be obtained for individual twin components. The new data set represents an important contribution to the characterization of LaAlO3 single crystals which are widely used as the substrate for a plethora of different thin films with technological applications.

Original languageEnglish (US)
Article number035403
JournalJournal of Physics Condensed Matter
Volume22
Issue number3
DOIs
StatePublished - Jan 29 2010

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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