Growth of (1 - X)NaNbO3-xBaTiO3 single crystals by slow-cooling and flux methods

Takayuki Watanabe, Hisato Yabuta, Miki Ueda, Masatoshi Watanabe, Tatsuya Suzuki, Kaoru Miura, Naoko Ito, Nobuhiro Kumada

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Abstract

(1 - x)NaNbO3-xBaTiO3 single crystals were grown by slow-cooling and flux methods. In the slow-cooling method, 0.88NaNbO 3-0.12BaTiO3 powder was melted in a platinum crucible at 1500 °C and cooled down to 1000 °C. Slow cooling at less than 21 °C/h led to a bulky single crystal, and the BaTiO3/NaNbO 3 ratio was graded inside the single crystal as expected from the phase diagram. Further slow cooling at 5 °C/h with the aim of improving the compositional uniformity increased the level of contamination of platinum in the single crystals from the crucible. Cuboidal single crystals with a (100) facet were grown in Na2B4O7 flux through a cooling process from 1200 to 1000 °C at 1 °C/h. There was no compositional gradient inside the cuboidal crystals, and the BaTiO3 content of the single crystals remained within 2-3% irrespective of the raw powder/flux ratio and the BaTiO3 composition in the raw powder. The obtained single crystals were orthorhombic ferroelectrics with a phase transition temperature of 310-330 °C.

Original languageEnglish
Article number09KC02
JournalJapanese journal of applied physics
Volume52
Issue number9 PART2
DOIs
Publication statusPublished - Sep 1 2013
Externally publishedYes

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All Science Journal Classification (ASJC) codes

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

Cite this

Watanabe, T., Yabuta, H., Ueda, M., Watanabe, M., Suzuki, T., Miura, K., ... Kumada, N. (2013). Growth of (1 - X)NaNbO3-xBaTiO3 single crystals by slow-cooling and flux methods. Japanese journal of applied physics, 52(9 PART2), [09KC02]. https://doi.org/10.7567/JJAP.52.09KC02