J. Phys. Colloques
Volume 33, Numéro C2, Avril 19722e CONGRÈS EUROPÉEN DE FERROÉLECTRICITÉ
|Page(s)||C2-44 - C2-48|
J. Phys. Colloques 33 (1972) C2-44-C2-48
NOISE MEASUREMENTS IN FERROELECTRICSL. GODEFROY
Due to the strong non-linearity in the vicinity of the Curie temperature the classical bridge measurements of permittivity are irrelevant for ferroelectric materials. In order to avoid this difficulty several authors have suggested deducing the permittivity from noise measurements. The theoretical aspect of the problem and that of the experimental design are described : classically the crystal is loaded with a variable resistor ; more recently, an auxiliary noise generator has been used. This new method seems to allow a more accurate solution of the problem.