NMR relaxation study of ion dynamics in nanocrystalline and polycrystalline LiNbO3

Article Abstract:

Experiments were performed to investigate the dynamic behavior of nanocrystalline and polycrystalline LiNbO3. Temperature-dependent nuclear magnetic resonance studies were performed. The diffusion-induced 7lithium (7Li) spin-lattice relaxation rate was measured. In addition, the activation energy and jump rate of ionic motion were also examined. A higher ion mobility was observed in the n-system and was attributed to the reduced activation energy of 0.27 eV. An improvement in Li diffusivity was observed and attributed to the higher ion mobility in the interfacial regions.

Lattice dynamics, Crystals, Thermal analysis

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Preparation by high-energy milling, characterization, and catalytic properties of nanocrystalline TiO(sub 2)

Article Abstract:

The investigation of the influence of mechanical attrition on structure and photocatalytic activity of titanium dioxide (TiO(sub 2)) reveals that the surface structure is influenced by the bulk reduction state of TiO(sub 2). High-energy milling causes reduction in the grain size and a corresponding increase and modification of the surface structure.

Titanium dioxide, Catalysis, Structure, Chemical properties

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NMR investigations on ion dynamics and structure in nanocrystalline and polycrystalline LiNbO3

Article Abstract:

Nanocrystalline (n-) LiNbO3 samples with average grain sizes between 16 and 105 nm are prepared from polycrystalline (p-) material. NMR investigations of the (super 7)Li spin-lattice relaxation (SLR) rate T1(super -1) are presented to study the dynamic behavior of Li ions.

Usage, Nuclear magnetic resonance

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