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Conductivity and crystallography of new alkali rare-earth silicates synthesized as possible fast-ion conductors

Haile, S. M. and Wuensch, B. J. and Siegrist, T. and Laudise, R. A. (1992) Conductivity and crystallography of new alkali rare-earth silicates synthesized as possible fast-ion conductors. Solid State Ionics, 53 (Pt. 2). pp. 1292-1301. ISSN 0167-2738. doi:10.1016/0167-2738(92)90328-M.

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Eight potassium neodymium silicates have been synthesized as possible fast-ion conductors. Hydrothermal growth experiments in the high-silica region of the SiO_2·H_2O·Nd_2O_3·K_2O system yielded crystals of the following phases (five of which are previously unreported): K_3NdSi_6O_(15), K_3Nd_3Si_(12)O_(32)OH, K_(10)Nd)4Si_(14)O_(39), K_4Nd_2Si_8O_(21), K_3NdSi_8O_(19), K_(12)Nd_2Si_(18)O_(45), K_5Nd_3Si_(20)O_(47), and KNd_9(SiO_4)_6O_2. The compositions and crystallographic data were determined using electron microprobe measurements and precession X-ray photographs, respectively. Single-crystal intensity data for phases K_3NdSi_6O_(15) and K_8Nd_3Si_(12)O_(32)OH were obtained with a four-circle diffractometer. Of these eight phases, six have been obtained as crystals large enough to permit conductivity measurements along at least one crystallographic axis. Conductivities were measured from 300 to 900 °C in an air atmosphere using either complex impedance techniques or single-frequency ac methods. Our results show that activation energies range from 0.3 to 2.2 eV, that the conduction process does not strictly follow the Arrhenius equation, and that these silicates are significantly anisotropic with respect to conductivity. In the K_3NdSi_6O_(15) phase this anisotropy corresponds well to expectations based on structural considerations.

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Haile, S. M.0000-0002-5293-6252
Additional Information:© 1992 Elsevier. We are indebted to A.J. Caporaso for assistance with hydrothermal synthesis, to M. Jercinovic and R. Opila for aid with the compositional analyses, and to Prof. H.L. Tuller and M. Spears for guidance in the conductivity measurements. We are pleased to acknowledge the support by an AT&T Cooperative Research Fellowship (S.M. Haile) and by the TDK Chair in Materials Science and Engineering (B.J. Wuensch).
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AT&T Cooperative ResearchUNSPECIFIED
TDK Chair in Materials Science and EngineeringUNSPECIFIED
Issue or Number:Pt. 2
Record Number:CaltechAUTHORS:20131125-162532644
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42723
Deposited By: Jonathan Gross
Deposited On:02 Dec 2013 21:52
Last Modified:01 Jun 2023 22:37

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