An NMR Study of the Metal-insulator Transition in Tantalum-doped Sodium Tungsten Bronze |
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Page 56
... particles are covered by a fine dust . This fine dust of particles is removed by washing the sample in water and passing the water - particle slurry through filter paper . The very fine particles either pass through the paper or are ...
... particles are covered by a fine dust . This fine dust of particles is removed by washing the sample in water and passing the water - particle slurry through filter paper . The very fine particles either pass through the paper or are ...
Page 118
... particles and found that particles 50 angtroms in diameter and larger had essentially the same properites as bulk Pt . For smaller particles , surface effects became important , and the line shape and spin - lattice relaxation time were ...
... particles and found that particles 50 angtroms in diameter and larger had essentially the same properites as bulk Pt . For smaller particles , surface effects became important , and the line shape and spin - lattice relaxation time were ...
Page 152
... particles ) . Rhodes et al . found that particles 50Å ( 15 lattice constants ) in diameter have a Knight shift and relaxation rate given by the bulk values . Even for the smallest particles studied ( 10-15Å , 3-4 lattice constants ) ...
... particles ) . Rhodes et al . found that particles 50Å ( 15 lattice constants ) in diameter have a Knight shift and relaxation rate given by the bulk values . Even for the smallest particles studied ( 10-15Å , 3-4 lattice constants ) ...
Contents
Previous Work on the Tungsten Bronzes | 29 |
Sample Preparation and Analysis | 46 |
Experimental Techniques and Apparatus | 72 |
6 other sections not shown
Common terms and phrases
absorption line absorption line shape Altshuler Anderson localization Aronov baking Bohr radius boxcar bronze samples chapter Clark composition conduction band conduction electron conduction electron concentration contact interaction core polarization correlation coulomb cubic phase curves for samples density diffusion runs disorder distribution doped semiconductor Doumerc energy EPMA eq'n experimental Fermi level Fermi surface Figure homogeneous Hubbard model inhomogeneously insulating samples insulating side Knight shift Korringa relation Larmor frequency lattice constant Lett Lightsey linewidth M-I transition Magnetization recovery curves Marcus measured melt metal-insulator metallic samples micron Mott msec Na₂ WO4 Narath nearest neighbor NMR properties non-exponential nuclear magnetization nuclei orbitals particles Phys predicts pulse quartz ratio resonance rigid band model scaling theory scattering signal sodium content spectrometer spin diffusion spin echo spin-lattice relaxation spin-lattice relaxation rate T₁ T₂ Ta-doped samples tantalum tantalum-doped temperature dependence Thesis unpublished tungsten tungsten bronze Tunstall WO₂ x-ray