Relationship between activation energy and bottleneck size for Li+ ion conduction in NASICON materials of composition LiMM'(PO4)3; M, M' = Ge, Ti, Sn, Hf
Article Abstract:
The activation energy involved in the Li+ ion conduction in NASICON materials of composition LiMM'(PO4)3; M, M' = Ge, Ti, Sn, Hf was investigated using electrical conductivity measurements. Two lithium sites inside the conduction channels can be identified and are joined through triangular bottlenecks of oxygen atoms. The size of the bottleneck was calculated from refined and simulated structures for each composition. Two regimes exist as shown by the plot of activation energy versus bottleneck size.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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FT-IR study of the nature of the proton and Li+ motions in gramicidin A and C
Article Abstract:
Research was conducted to examine gramicidin A and C and their proton and Lii+ complexes using FT-IR spectroscopy. Infrared continuous absorption is observed with an increasing number of hydrated and protonated channels. The Li+ channels in gramicidins reveal large Li+ polarizability due to the very fast Li+ ion fluctuations. Thus, the shifts of the Li+ ions cannot be responsible for the Li+ polarizability of the gramicidin channels.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Intramolecular proton transfer in inclusion complexes of cyclodextrins: role of water and highly polar nonaqueous media
Article Abstract:
The molecule 4-methyl-2,6-dicarbomethoxyphenol (CMOH) was used as a guest to investigate the excited-state intramolecular proton transfer within cyclodextrin cavity in aqueous and highly polar nonaqueous solvents. Results showed that CMOH forms 1:1 complex with alpha-cyclodextrin and 1:2 complex with beta-cyclodextrin. Moreover, enhancement of tautomer emission is much higher in water than in highly polar nonaqueous media.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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