Nuclear Magnetic Susceptibility of Solid and of Dilute Solid Mixtures of in
- 1 May 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 7 (5), 1709-1723
- https://doi.org/10.1103/physreva.7.1709
Abstract
Continuous-wave NMR was used to study the temperature dependence of the static nuclear magnetic susceptibility of solid and solid mixtures of in . Measurements were performed in the purest sample (3.7× in ) at four molar volumes (21, 22, 23, and 24 /mole) in the bcc phase, and at several concentrations ranging from 3.7× to 2.0× at 21 and 23 /mole. The temperature range of the measurements was from 0.95 to 0.32 K. The data were fitted to a Curie-Weiss law with an rms deviation from best fit of less than and best values of the Weiss constant were obtained. Susceptibilities and temperatures were measured to better than 0.1%. The temperature scale was based upon the susceptibility of the purest, most-dense sample. The desired accuracy in the susceptibility measurements necessitated a new method of data reduction. The accuracy in the extracted values of was better than ±1 mk. The values of in the purest sample (-0.24±0.82 mK at 21 /mole, -1.03±1.06 mK at 22 /mole, -1.49±0.27 mK at 23 /mole, and -3.07±0.78 mK at 24 /mole) agreed within experimental uncertainty with those of earlier workers, operating at lower temperatures. They provide a high-temperature check on those measurements. The measured effects on of the impurity are consistent with the work of Richards and Homer, but the measurements show an improved accuracy. The data, as a function of , the atomic fraction of , have been fitted to the equation . Values of of -430±450 and -19±10 were obtained at 21 and 23 /mole, respectively.
Keywords
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