"Internal friction." . . "Sodium compounds." . . "Crystal defects." . . "Dielectric properties." . . "UTAH UNIV SALT LAKE CITY INST OF MATERIALS RESEARCH." . . "Dipole moments)" . . "Solid State Physics." . . "Atomic orbitals." . . . . . . . . . . "A loss peak caused by addition of NaF to CaF2 was studied by dielectric loss and internal friction methods. Equations for the observed relaxation times of the sodium ion-fluorine vacancy dipole in electrical and mechanical fields are given. It is proposed that the dipole relaxation occurs by fluorine vacancy jumps in the <100> direction of the first coordination shell of the sodium impurity. A possible explanation of the observed peak broadening as a function of dipole concentration is offered. (Author)."@en . . . . . "Electrical and mechanical relaxation in caf2 doped with naf"@en . . . . . . . . . . . "Fluorides." . . "Doping." . . "Electric fields." . . "Relaxation time." . . "(Calcium fluorides." . . "Solid solutions." . .