ISSN:
1432-0630
Keywords:
66.30
;
76.60
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract The relaxation timesT 1,T 1q,T 1D, andT 2 for1H in the tetragonal-A phase of HxWO3 have been measured over the temperature range 190 to 490 K. The1H relaxation behaviour appears to be governed by diffusion over inequivalent jump distances, approximating to a short range planar diffusion and a long range isotropic diffusion. Parameters for the latter motion are estimated asE a = 68 kJ/mol andτ 0=2.5×10−13 s. The powder X-ray diffraction pattern for this phase of HxWO3 has been studied over the temperature range 300–470 K. The tetragonal distortion diminishes with temperature and H0.43 WO3 becomes cubic at about 435 K. Volumetric studies of hydrogen evolution show that decomposition accelerates at approximately this temperature.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00615466
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