Millimeter wave dielectric properties of single crystal strontium barium niobate (Sr0.61Ba0.39Nb2O6) at cryogenic temperatures

摘要

The dielectric properties of single crystal SBN were measured for a number of samples at 30–50 GHz and at 90–100 GHz. Because of the recent availability of large high quality crystal samples from the ferroelectric materials development effort at the Science Center, we were able to make the first determination of the nonlinear coefficients dn3/dE3 and dn1/dE3 at liquid nitrogen temperature. The results are extremely encouraging, as it was demonstrated that these coefficients did not substantially decrease in value at low temperatures. In addition, the data provided the basis for a model to describe the fundamental mechanism controlling the susceptibility in this class of material.