phasenzentrum

Phasenzentrum refers to a specific point within a crystal lattice. In certain crystals, particularly ferroelectrics and superconductors, the centers of positive and negative charge do not coincide. The phasenzentrum is the location where these oppositely charged centers are displaced relative to each other. This displacement is often responsible for the macroscopic electrical polarization observed in ferroelectric materials and the Meissner effect in superconductors. The concept is crucial for understanding the dielectric and superconducting properties of these materials. The exact position of the phasenzentrum can depend on factors like temperature and applied electric fields. Its precise definition and location are determined through crystallographic analysis and experimental measurements. In some contexts, the term "center of symmetry" might be contrasted with the phasenzentrum, as the presence of a phasenzentrum implies a breaking of inversion symmetry within the unit cell.