Accession Number:

AD0601675

Title:

DEFECT STRUCTURE FERROELECTRICS (DIELECTRIC AND STRUCTURAL INVESTIGATIONS OF FERROELECTRICS POSSESSING DEFECT STRUCTURES).

Descriptive Note:

Technical rept. no. 1, Sep 61-May 64.

Corporate Author:

ILLINOIS UNIV URBANA

Personal Author(s):

Report Date:

1964-06-20

Pagination or Media Count:

73.0

Abstract:

The dielectric and X-ray structural properties of the system NaNb03-Sr0.5Nb03 were determined from the end member NaNb03 to the limit of the solid solution at Na0.50Sr0.25Nb03. A ferroelectric phase was found to exist in this system beyond a concentration of 10 mole percent of SrNb206. No distinct morphotropic phase boundary between this ferroelectric phase and the antiferroelectric phase of NaNb03 was observed. The crystalline symmetry of the perovskite sub-cell of pure NaNb03 was determined as a function of temperature using CuK alpha radiation. The sub-cell symmetries of the compositions studied in the system were determined as functions of temperature. It was determined that the ferroelectric phase in this system possesses a multiple cell perovskite structure which is related to the antiferroelectric structure of pure NaNb03. The weak superstructure lines exhibited in the X-ray patterns of NaNb03 and these solid solutions vanished when the perovskite sub-cell edge attained a value of 3.941A.

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE