Scattering intensity and related measurements have established the tricritical exponents for the divergences of the concentration susceptibility, $\gamma$, and of the correlation length for concentration fluctuations, $\nu$, have indicated a probable value for the exponent $\eta$, and have established a region of tricritical scaling.

• Received 8 July 1974

DOI:https://doi.org/10.1103/PhysRevLett.33.483