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A study of the specific heat of high-purity single-phase dhcp La shows that this material is an intrinsic type-II superconductor with a K of about 2.4. The temperature dependence of the free energy is characteristic of an intermediate coupling superconductor with 2b/k8 T, = 3.7.

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Self-diffusion in chromium single crystals has been measured over the temperature range 1073 to 1446 K. These data, when combined with earlier measurements from this laboratory over the. range 1370 -2090 K, yield a plot of lnD vs 1/T, which is straight over ten orders of magnitude in the diffusion coefficient D. The high values of the preexponential factor (1280+ 230 cm's ') and activation enthalpy (4.58+ 0.03 eV) are not readily interpreted in terms of a specific diffusion mechanism. They appear to be too high to be interpreted in terms of a monovacancy mechanism. The possible contribution of divacancies and self-interstitials are discussed.

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