Compositionally graded epitaxial barium strontium titanate thin films derived from pulsed laser deposition

S. G. Lu, X. H. Zhu, Chee Leung Mak, K. H. Wong, H. L W Chan, C. L. Choy

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

Epitaxial graded barium strontium titanate (BaxSr1-x)TiO3(x = 0.75, 0.8, 0.9, 1.0) thin films were prepared through pulsed laser deposition method on the (La0.7Sr0.3)MnO3(LSMO)/LaAlO3(LAO) substrate. XRD analysis indicated the graded film had a broadened 2θ peak at 45° for the (2 0 0) peak. The energy dispersive analysis of X-ray (EDAX) showed a gradient change of Ba/Sr composition. P-E loop measurement gave a remnant polarization about 2μC cm-2, and without big up offset observed. A big room temperature dielectric constant as high as 1600 was obtained and has an approximately linear relationship with temperature from room temperature to 130°C. All these results can be ascribed to the epitaxial and graded structure of BST thin films.
Original languageEnglish
Pages (from-to)164-168
Number of pages5
JournalMaterials Chemistry and Physics
Volume79
Issue number2-3
DOIs
Publication statusPublished - 10 Apr 2003

Keywords

  • BST
  • Compositional gradient
  • Dielectric constant
  • PLD
  • Thin films

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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