The growth of highly crystalline, idiomorphic potassium titanoniobate crystals by the cooling of a potassium chloride flux

Katsuya Teshima, Sunhyung Lee, Akiko Yamaguchi, Sayaka Suzuki, Kunio Yubuta, Takahiro Ishizaki, Toetsu Shishido, Shuji Oishi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Highly crystalline, well-developed potassium titanoniobate (KTiNbO 5 and KTi3NbO9) crystals were successfully grown at temperatures ranging from 700 to 1000 °C by a KCl flux cooling method. Colourless and transparent KTiNbO5 crystals with a smallest average size of 750 nm were grown at a relatively low temperature of 700 °C. The sizes of grown crystals were observed to greatly dependent on the holding temperature and solute concentration. HRTEM observations indicated that the flux-grown KTiNbO5 crystals were of high quality. The band gap energies of the fabricated KTiNbO5 and KTi3NbO9 crystals, as estimated from their absorption edges in UV-vis diffuse reflectance spectra, were approximately 3.54 and 3.35 eV, respectively. Furthermore, these crystals exhibited good photocatalytic activities under UV light irradiation. The photodecomposition of TCE gas occurred via a photocatalytic process under UV light irradiation. This study demonstrates that KCl flux cooling is an environmentally friendly and nature-mimetic process for growing high-quality, well-developed, and photocatalytic KTiNbO5 and KTi3NbO9 crystals.

Original languageEnglish
Pages (from-to)1190-1196
Number of pages7
JournalCrystEngComm
Volume13
Issue number4
DOIs
Publication statusPublished - 2011 Feb 21
Externally publishedYes

Fingerprint

potassium chlorides
Potassium Chloride
Potassium
potassium
Fluxes
Crystalline materials
Cooling
cooling
Crystals
crystals
Ultraviolet radiation
Irradiation
photodecomposition
irradiation
Temperature
solutes
Energy gap
Gases
reflectance
temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

The growth of highly crystalline, idiomorphic potassium titanoniobate crystals by the cooling of a potassium chloride flux. / Teshima, Katsuya; Lee, Sunhyung; Yamaguchi, Akiko; Suzuki, Sayaka; Yubuta, Kunio; Ishizaki, Takahiro; Shishido, Toetsu; Oishi, Shuji.

In: CrystEngComm, Vol. 13, No. 4, 21.02.2011, p. 1190-1196.

Research output: Contribution to journalArticle

Teshima, K, Lee, S, Yamaguchi, A, Suzuki, S, Yubuta, K, Ishizaki, T, Shishido, T & Oishi, S 2011, 'The growth of highly crystalline, idiomorphic potassium titanoniobate crystals by the cooling of a potassium chloride flux', CrystEngComm, vol. 13, no. 4, pp. 1190-1196. https://doi.org/10.1039/c0ce00080a
Teshima, Katsuya ; Lee, Sunhyung ; Yamaguchi, Akiko ; Suzuki, Sayaka ; Yubuta, Kunio ; Ishizaki, Takahiro ; Shishido, Toetsu ; Oishi, Shuji. / The growth of highly crystalline, idiomorphic potassium titanoniobate crystals by the cooling of a potassium chloride flux. In: CrystEngComm. 2011 ; Vol. 13, No. 4. pp. 1190-1196.
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