Lattice Distortions and Phase Transitions of Hydrogen in Niobium

Lattice distortion due to hydrogen in niobium have been studied by various X-ray and neutron scattering methods. All the important quantities describing the lattice distortions have been determined: The defect volume, the long-range displacement field described by the force dipole tensor, the local displacements of the hydrogen neighbors and the Kanzaki forces necessary to create the observed lattice distortions.