Coherency strain enhanced dielectric-temperature property of rare-earth doped BaTiO3

Core/shell-grained BaTiO3 samples were prepared with addition of rare earth elements. The core/shell interface was semi-coherent, and many misfit dislocations formed in Dy-doped samples. In contrast, a coherent interface and few dislocations were observed in Ho- and Er-doped samples. Dy-doped sample...

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Bibliographic Details
Published in:Applied physics letters 2013-03, Vol.102 (11)
Main Authors: Jeon, Sang-Chae, Kang, Suk-Joong L.
Format: Article
Language:English
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Summary:Core/shell-grained BaTiO3 samples were prepared with addition of rare earth elements. The core/shell interface was semi-coherent, and many misfit dislocations formed in Dy-doped samples. In contrast, a coherent interface and few dislocations were observed in Ho- and Er-doped samples. Dy-doped samples exhibited poor temperature stability, showing a peak with no frequency dispersion. Ho- and Er-doped samples exhibited a broad curve with frequency dispersion. This improved temperature stability is attributed to the coherency strain, which leads to the formation of polar nano-regions in the shell. Coherency at the core/shell interface is critical to improve the temperature stability of core/shell-structured BaTiO3.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4798273