Abstract
The α-α′ phase transition of hydrogen in niobium closely resembles a gas-liquid transition of a real gas and is attributed to the elastic interaction via the lattice distortions due to the hydrogen atoms. Because of the range of the interaction, the critical fluctuations at the critical point of the α-α′ transition are drastically suppressed in a coherent lattice. X-ray scattering studies of Nb crystals, loaded in situ with hydrogen, show that, below the critical point, coherent inhomogeneous hydrogen density fluctuations exist. They are due to a smooth density variation over the whole sample size and depend sensitively on its shape through the fulfilment of the elastic boundary condition.
Published Version
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