NDLI: Electrical conductivity, DSC, XRD, and 7Li NMR studies of rotator crystals n-C21H43COOLi x K(1 − x) (0.33 ≤ x ≤ 0.50), n-C m H(2m + 1)COOLi, and n-C m H(2m + 1)COOK (m = 13, 15, 17, 19, and 21)

Content Provider	Springer Nature Link
Author	Hayasaki, Tomoyuki Honda, Hisashi Hirakawa, Satoru
Copyright Year	2012
Abstract	Differential scanning calorimetry (DSC) thermograms, X-ray diffraction (XRD) analysis, electrical conductivity (σ), and 7Li NMR spectroscopy characterization of n-C m H(2m + 1)COOM solids (M = Li, Na, K; m = 13, 15, 17, 19, 21) and mixed crystals n-C21H43COOLi x K(1 − x) (0.25 ≤ x ≤ 0.75) was performed as a function of temperature. DSC thermograms of n-C m H(2m + 1)COOM revealed several solid-solid phase transitions with large entropy changes. Electrical conductivity studies established that n-C m H(2m + 1)COOLi crystals are poor electrical conductors. In contrast, n-C m H(2m + 1)COOK salts were found to have σ values of 10 − 7–10 − 8 S·cm − 1. Since the crystal structures and phase-transition temperatures of both n-C m H(2m + 1)COOLi and n-C m H(2m + 1)COOK crystals were similar, they were able to form mixed crystals with the structure n-C x H(2m + 1)COOLi x K(1 − x). DSC thermograms of the mixed crystals showed a small entropy change at the melting point (ΔS mp < 13 J K − 1 mol − 1), in addition, large ΔS values at the solid-solid phase transition temperature. The σ values obtained for mixed crystals were roughly one order of magnitude greater than those determined for n-C21H43COOK crystals. 7Li NMR spectra of the mixed crystals recorded at various temperatures suggested that the self-diffusion of Li + ions was excited in the highest-temperature solid phase. Based on these results, we have classified these mixed crystals as rotator crystals.
Starting Page	27
Ending Page	42
Page Count	16
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	222
Issue Number	1-3
e-ISSN	15729540
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-10-25
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Rotator phase Ion conductor 7Li NMR Mixed crystal Nuclear Physics, Heavy Ions, Hadrons Atomic, Molecular, Optical and Plasma Physics Condensed Matter Physics Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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