Preparation and characterization of compositionally graded epitaxial barium strontium titanate thin films via scanning probe microscopy

S. G. Lu, Haydn Chen, Chee Leung Mak, K. H. Wong, H. L.W. Chan, C. L. Choy, J. J. Xu, San-Qiang Shi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Epitaxially graded barium strontium titanate (BaxSr1-x)TiO3(x = 0.75,0.8,0.9,1.0, abbreviated as BST75, BST80, BST90 and BTO respectively) thin films were fabricated by pulsed laser deposition method on the (La0.7Sr0.3)MnO3(LSMO)/LaAlO3(LAO) single crystal substrate. Scanning probe microscopy with a contact mode was used to characterize the temperature dependence of polarization from room temperature to 140°C. Results indicated that the piezo-response signal of the BST graded films had an obvious change with temperature, and that the graded structures had a flatter temperature dependence of permittivity. Furthermore, the contrasts of the SPM images were lower for the ferroelectric - paraelectric (F-P) phase transition temperatures of BST 75, BST 80, and BST90, but higher for the F-P transition temperature of BTO.
Original languageEnglish
Pages (from-to)1903-1908
Number of pages6
JournalKey Engineering Materials
Volume280-283
Issue numberII
Publication statusPublished - 1 Dec 2005

Keywords

  • Barium strontium titanate
  • Scanning force microscopy
  • Thin film

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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