Articles you may be interested inEvidence of magnetoelectric coupling on calcium doped bismuth ferrite thin films grown by chemical solution deposition

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Measurements were made of the real part of the dielectric constant and loss tangent of 32 commercial ferrites at x-band at temperatures from 25 C to 250 C, but not exceeding the curie temperature. A modified perturbation technique was used for these measurements.' The principal modification included a correction based on the diameter and real part of the dielectric constant. For a sample diameter of 35 mils, the correction ranged from 4 to 10% for dielectric constants of 7 to 16, respectively. Expressions were also derived for'the correction due to the contribution of the irises and metal losses to the cavity Q, since the resonant frequency of the cavity changed when a sample was introduced. The accuracy in the measurement of the real part of the dielectric constant is ± 3%, where 1% is attributed to the taper and ellipticity of the samples and 2% to the electrical measurement. The accuracy in the measurement of the loss tangent is ± 0.0005. U. S. ARMY SIGNAL RESEARCH AND DEVELOPMENT LABORATORY FORT MONMOUTH, NEW JERSEY CONTENTS

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