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Hydrothermal synthesis of perovskite and pyrochlore powders of potassium tantalate

Goh, Gregory K. L. and Haile, Sossina M. and Levi, Carlos G. and Lange, Fred F. (2002) Hydrothermal synthesis of perovskite and pyrochlore powders of potassium tantalate. Journal of Materials Research, 17 (12). pp. 3168-3176. ISSN 0884-2914. https://resolver.caltech.edu/CaltechAUTHORS:20111101-161059152

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Abstract

Potassium tantalate powders were hydrothermally synthesized at 100 to 200 °C in 4 to 15 M aqueous KOH solutions. A defect pyrochlore, Kta_(2)O_(5)(OH). nH2O (n ≈ 1.4), was obtained at 4 M KOH, but at 7–12 M KOH, this pyrochlore was gradually replaced by a defect perovskite as the stable phase. At 15 M KOH, there was no intermediate pyrochlore, only a defect perovskite, K_(0.85)Ta_(0.92)O_(2.43)(OH)_(0.57) 0.15H_(2)O. Synthesis at higher KOH concentrations led to greater incorporation of protons in the perovskite structures. The potassium vacancies required for charge compensation of incorporated protons could accommodate water molecules in the perovskite structure.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1557/JMR.2002.0458 DOIArticle
http://journals.cambridge.org/abstract_S0884291400067108PublisherArticle
ORCID:
AuthorORCID
Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2002 Materials Research Society. Received 16 May 2002; accepted 17 September 2002. Published online by Cambridge University Press: 31 January 2011. This work was supported by the Materials Research Laboratory program of the National Science Foundation under Award No. DMR00-80034. G.K.L. Goh acknowledges the Institute of Materials Research and Engineering (Singapore) for the provision of a research scholarship. Dr. Sonjong Hwang of the California Institute of Technology kindly collected the NMR data.
Funders:
Funding AgencyGrant Number
NSFDMR00-80034
Institute of Materials Research and Engineering (Singapore)UNSPECIFIED
Issue or Number:12
Record Number:CaltechAUTHORS:20111101-161059152
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20111101-161059152
Official Citation: Gregory K. L. Goh, Sossina M. Haile, Carlos G. Levi and Fred F. Lange (2002). Hydrothermal synthesis of perovskite and pyrochlore powders of potassium tantalate. Journal of Materials Research, 17 , pp 3168-3176 doi:10.1557/JMR.2002.0458
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27566
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:03 Nov 2011 02:16
Last Modified:03 Oct 2019 03:24

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