ANALYSIS OF INTERNAL-FRICTION PEAKS IN THE INTERMEDIATE TEMPERATURE-RANGE OF NACL

We measured internal friction, Young's modulus, ionic conductivity cor responding to the density of vacancies and the dielectric loss corresp onding to the dipole density at the same time by an automated Marx's c omposite oscillator method, in order to investigate the internal frict ion peaks of NaCl single crystal around 90-degrees-C. We observed peak s for both internal friction and dielectric loss, and interpreted the peaks to reflect relaxation by dipole reorientation.