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Hydrothermal synthesis of new alkali silicates II. Sodium neodymium and sodium yttrium phases

Haile, S. M. and Wuensch, B. J. and Laudise, R. A. (1993) Hydrothermal synthesis of new alkali silicates II. Sodium neodymium and sodium yttrium phases. Journal of Crystal Growth, 131 (3-4). pp. 373-386. ISSN 0022-0248. https://resolver.caltech.edu/CaltechAUTHORS:20131125-162532325

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Abstract

Hydrothermal techniques have been utilized to synthesize three sodium neodymium and seven sodium yttrium silicates as potential new fast ion conductors (FICs). We describe here the conditions which led to the crystallization of NaNdSi_6O_(14), Na_3NdSi_6O_(15)· 5H_2O, NaNd_9(SiO_4)_6O_2, Na_3YSi_6O_(15), Na_3YSi_7O_(17), Na_7YSi_(12)O_(29), Na_3YSi_3O_9, Na_5YSi_4O_(12), Na_6YSi_(13)O_(29)(OH)_3, and NaYSi_6O_(14), six of which are previously unreported. The compositions of new phases were determined from electron microprobe measurements and flame spectroscopy. Syntheses were carried out in aqueous solutions of NaOH, Na_2CO_3, NaF, NaHF_2, at pressures, temperatures, and molarities ranging from 0.5 to 1.4 kbar, from 350 to 600°C, and from 0 to 10M, respectively. Results obtained in these sodium systems are compared with those of the potassium neodymium silica system, reported in Part I. Consistent with the earlier observations, crystallization at high temperatures, high solution molarities and, to some extent, high pressures tended to yield phases of low silica content and low silicon to oxygen ratios, and hence low structural connectivity of the tetrahedra in the silica framework.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0022-0248(93)90186-ZDOIArticle
http://www.sciencedirect.com/science/article/pii/002202489390186ZPublisherArticle
ORCID:
AuthorORCID
Haile, S. M.0000-0002-5293-6252
Additional Information:Copyright © 1993 Elsevier. Received 27 March 1993. Accepted 20 April 1993. Many thanks are due to Anthony J. Caporaso (AT&T Bell Laboratories) for instruction and guidance in the hydrothermal technique and Bill Grodkiewicz (AT&T Bell Laboratories) for aid in glass preparation. We are indebted to Mike Jercinovic (Massachusetts Institute of Technology) and Ortrud Buresch (Max-Planck-Institut für Festkörperforschung) for assistance with composition determinations from WDX and flame spectroscopy measurements, respectively. The authors are also grateful to Dr. Karl Peters (Max-Planck-Institut für Festkörperforschung), who has kindly provided single crystal intensity data for some phases. S. Haile additionally acknowledges the generous financial support of the AT&T Cooperative Fellowship Research Program.
Funders:
Funding AgencyGrant Number
AT&T Cooperative FellowshipUNSPECIFIED
Issue or Number:3-4
Record Number:CaltechAUTHORS:20131125-162532325
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131125-162532325
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42721
Collection:CaltechAUTHORS
Deposited By: Jonathan Gross
Deposited On:03 Dec 2013 01:05
Last Modified:03 Oct 2019 06:01

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