Accession Number:

AD0617993

Title:

DIELECTRIC DISPERSION OF SOME PEROVSKITE ZIRCONATES,

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE SPECTROSCOPY LAB

Report Date:

1965-01-06

Pagination or Media Count:

2.0

Abstract:

The dielectric properties of perovskites have been the subject of many investigations, but a direct correlation between the dielectric constant and a normal optically active lattice mode has been convincingly established only in the case of the paraelectric strontium titanate. The identification of this so-called soft mode is still debated. Such an assignment of the normal-mode spectrum in perovskites is now achieved by a comparison of the normal modes of titanates and zirconates. In addition, evidence is presented that also in the case of an antiferroelectric material, lead zirconate, the low-frequency dielectric constant is the result of a low-frequency optically active mode, at K O, whose contribution tothe dielectric constant accounts for about 90 of its value at room temperature. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE