Role of reaction atmosphere in preparation of potassium tantalate through sol–gel method

Abstract

Potassium tantalate (KT) thin films and powders of both K2Ta2O6 (KT pyrochlore) and KTaO3 (KT perovskite) structures were prepared by means of chemical solution deposition method using Si(111) with ZnO and MgO buffer layers as a substrate. The influence of reaction atmosphere on reaction pathway and phase composition for both KT powders, and KT thin films has been studied mainly by means of powder diffraction and infrared spectroscopy. When an oxygen flow instead of static air atmosphere has been used the process of pyrolysis in oxygen runs over much narrower temperature interval (200–300 °C), relatively to air atmosphere (200–600 °C) and almost no (in case of powders), or no (in case of thin films) pyrochlore intermediate phase has been detected in comparison with treatment in air, where the pyrochlore phase is stable at temperatures 500–600 °C (powders). KT perovskite phase starts to crystallize at temperatures 50° and 150 °C lower compared to air atmosphere in case of powders and thin films, respectively. Microstructure formed by near-columnar grains and small grains of equiaxed shape was observed in films treated in oxygen and air atmosphere, respectively.

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Acknowledgments

This work was supported by the Projects of the Grant Agency of Academy of Sciences of the Czech Republic No. 13-03708S, ALISI (EU Commission) and Ministry of Education, Youth, and Sports of the Czech Republic No. CZ.1.05/2.1.00/01.0017. The authors are grateful to the following collaborators: A. Petřina, K. Knížek and P. Bezdička for XRD measurements, and E. Večerníková, M. Maříková for FTIR measurements.

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Correspondence to Josef Buršík.

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Buršík, J., Vaněk, P. & Mika, F. Role of reaction atmosphere in preparation of potassium tantalate through sol–gel method. J Sol-Gel Sci Technol 68, 219–233 (2013). https://doi.org/10.1007/s10971-013-3158-7

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Keywords

  • Potassium tantalate
  • Thin films
  • Sol–gel
  • Crystallization
  • Reaction atmosphere