Abstract
In recent years, the residual resistivity ratio has been widely used as a sensitive indicator of chemical purity in high purity metals. The conventional four terminal measurement of resistivity becomes difficult either with large or irregular specimens or with increasing purity and decreasing temperature. This paper describes an alternative technique, called the eddy current decay method, which greatly reduces the above difficulties. The eddy current measurements do not require any attachment of leads, and in fact, the measurement process is totally non-destructive to the specimen. The eddy current apparatus is described, and some typical applications are presented.
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