Effect of Ti concentration on the growth of chemically-ordered regions of Pb(Mg1/3Nb2/3)O3-PbTiO3 epitaxial thin films

Cangyu Fan, Takanori Kiguchi, Akihiro Akama, Toyohiko J. Konno

Research output: Contribution to journalArticle

Abstract

(1-x)Pb(Mg1/3Nb2/3)O3xPbTiO3 (PMNPT) (x = 01) epitaxial thin films with high crystallinity have been prepared by using metallo-organic decomposition (MOD) processes at a temperature half of the crystallization temperature of the corresponding bulk crystals. X-ray diffraction patterns show that Ti-poor and Ti-rich PMNPT thin films have perovskite-type structure with a single phase of pseudocubic and/or tetragonal phase, respectively. The morphotropic phase boundary (MPB) is located around x = 0.6. Chemically-ordered regions (CORs), where Mg and Nb ions at B-sites show 1:1 ordered structure in the 111 directions, are clearly detected by using aberration-corrected high angle annular dark field-scanning transmission electron microscopy (HAADFSTEM) images taken along the 110 directions, while it is difficult to analyze the detailed structure of the CORs by the electron or X-ray diffraction methods owing to the small volume. It showed that the density of COR rapidly decreases with increasing the Ti concentration, keeping the size of each COR, which infers that the COR may vanish at the Ti composition less than MPB. STEM analysis around the film/substrate interface shows the elastic interaction between CORs and local strain fields would be weak.

Original languageEnglish
Pages (from-to)565-569
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume123
Issue number1439
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Chemical solution deposition (CSD)
  • Chemically ordered region (COR)
  • Elastic interaction
  • HAADF-STEM
  • PMN-PT
  • Thin film

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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