netically fully saturated material. Unmagnetized specimens could not be measured because the attenuation was too high.We therefore determined the longitudinal wave velocity of a 99.6% dense polycrystalline specimen of Mno.49Zno.4sF%.o604. The measured value of 7.190kmsec -1 agrees very well with the one calculated from the single crystal elastic constants (7.157 km sec-1) according to the Voigt-Reuss-Hill or Hashin-Shtrikman averaging scheme. In our case too, excessive damping prevented the measurement of the shear-wave velocity in polycrystalline ferrite.

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