Sound velocities, densities, and lattice parameters of hot‐pressed bodies of the solid‐solution series Al2O3−Cr2O3 were investigated. Measured lattice parameters deviated slightly from Vegard's law. The compositional dependence of the longitudinal sound velocity agreed well with the predictions of Birch; the observed dependence of the bulk modulus on ionic volume did not agree with the relation of Anderson and Nafe.
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