Abstract
The local hydrogen concentration in NbH x was determined by means of neutron radiography and computerized tomography. A slowly varying hydrogen distribution over the whole volume of the samples was found in the coherent state of the host lattice inside the α-α′ miscibility gap. These fluctuations had been predicted by theory as a consequence of the elastic interaction between interstitials. Comparison with theory of the spatial hydrogen distribution strongly supports the concept of the elastic density modes in the spinodal region. A dependence on sample shape owing to the long range of the elastic interaction is reflected in the experimental results.
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