Accession Number : AD0615930

Title :   DIELECTRIC DISPERSION IN FERROELECTRIC ROCHELLE SALT.

Descriptive Note : Interim scientific rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MASS CRUFT LAB

Personal Author(s) : Sandy,Frank

Report Date : 11 JAN 1965

Pagination or Media Count : 185

Abstract : The real and imaginary parts of the dielectric constant of Rochelle salt have been measured at frequencies from 2.5 Gc/sec to 17.12Gc/sec and at 155 Mc/sec. The measurements were made in the temperature range from 50C to 45C which includes both Curie temperatures. Measurements were made both with and without dc biases. The dielectric constant was found to undergo a relaxation of the Debye type whose relaxation time is proportional to the difference between the low-frequency, clamped, differential dielectric constant and its limiting highfrequency value. It was also found to have a small additional temperature dependence approximately proportional to T(5/4) and to increase slightly with polarization. Mitsui's model for the ferroelectric effect in Rochelle salt has been extended to cover its highfrequency dielectric behavior and has been shown to be consistent with these experimental results. (Author)

Descriptors :   (*DIELECTRIC PROPERTIES, FERROELECTRIC MATERIALS), (*FERROELECTRIC MATERIALS, DIELECTRIC PROPERTIES), POTASSIUM COMPOUNDS, SODIUM COMPOUNDS, TARTRATES

Distribution Statement : APPROVED FOR PUBLIC RELEASE