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Excerpt from Electrical Properties of Materials and Their Measurement at Low Temperatures
Some general Statements can be made: Impurity elements in solution always cause the resistivity to increase. 'the increase appears to be always linear with concentration as long an; the impurity remains in solution. The contributions of solute elements are additive, allowing calculation of low temperature resistivity from a good chemical anal ysis. In nearly all instances, the resistive contribution of an impurity measured at room temperature is within about 5% of the value found at 4 K. The low temperature value is usually higher.
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