Interface structure of Pb(Zr,Ti)O3/MgO(001) epitaxial thin film in early stage of Stranski-Krastanov growth mode

Takanori Kiguchi, Yumiko Kodama, Takumi Shimizu, Takahisa Shiraishi, Naoki Wakiya, Toyohiko J. Konno

Research output: Contribution to journalArticle

Abstract

This study investigated structural changes of Pb(Zr,Ti)O3/MgO(001) thin films prepared using MOCVD in the early stage of the Stranski-Krastanov growth mode. The strain state of the interface layer and the island region of PZT changes accompanied by a downward climb motion of misfit dislocations into the PZT/MgO interface with crystal growth. The local strain field around the misfit dislocation core formed in-plane compressive strain in the in-plane direction in the interface layer, which was strained tetragonally, but the island region had a pseudocubic structure. These results suggest that the residual strain induced phase stability modulation as well as Zr/Ti compositional gradient. A proposed model structure involves consequently dislocations with 110MgO slip on MgO can account for a stable interface without stacking fault. These results indicate the misfit strain-induced modulation of the interface structure and the phase stability in the early stage of the crystal growth on an atomic scale.

Original languageEnglish
Article numberSLLA08
JournalJapanese journal of applied physics
Volume58
Issue numberSL
DOIs
Publication statusPublished - 2019 Jan 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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