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We investigate the thermal diffusivity of nano-structured TiO2 and TiO2 with 3% ZnFe2O4 ceramic films (nm films) sputtered on a <111> cut Si substrates by using the Mirage effect method. Two series of films are prepared by the magneto-rf-spurt method. The investigation results show that: The thermal diffusivity of nano-structured film depends on the thickness of film and the annealing temperature. The thicker the film, the lower thermal diffusivity of the sample is. The value of thermal diffusivity increases with the increasing of the annealing temperature. It means that the thermal diffusivity depends on the phase structure of the film. The detail results, analyses and discussions will be presented in this paper. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

We investigate the influence of the grain size on the thermal diffusivity of pure Al[sub 2]O[sub 3] ceramics by using mirage effect. Results show that the value of thermal diffusivity decreases with increasing grain size, when the grain size of the sample is smaller than 200 nm, and the value of that increases with increasing grain size when the grain size is larger than 200 nm. The detailed experiments, the results, analyses, discussions are presented in this paper. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Energetic [sup 3]He particle mean free paths are calculated using in-situ wave amplitudes. The wave polarization (outward propagating, arc-polarized, spherical) and wave k directions (outward hemispherical) are included in a firstorder cyclotron resonant calculation. Values for λ[sub W-P] are ∼ 0.2 AU. This is roughly ∼ 5 times smaller than the particle mean free path as determined from modeling applied to measured front-to-back [sup 3]He particle anisotropies. It is suggested that this difference is due to much slower pitch angle diffusion through 90°. [ABSTRACT FROM AUTHOR]