Numéro
J. Phys. Colloques
Volume 33, Numéro C2, Avril 1972
2e CONGRÈS EUROPÉEN DE FERROÉLECTRICITÉ
Page(s) C2-44 - C2-48
DOI https://doi.org/10.1051/jphyscol:1972210
2e CONGRÈS EUROPÉEN DE FERROÉLECTRICITÉ

J. Phys. Colloques 33 (1972) C2-44-C2-48

DOI: 10.1051/jphyscol:1972210

NOISE MEASUREMENTS IN FERROELECTRICS

L. GODEFROY


Abstract
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.