THE HOMOGENEITY RANGES OF THE DELTA (DELTA)-PHASE AND GAMMA (GAMMA)-PHASE OF THE NI-ZN BINARY-SYSTEM GROWN BY THE REACTION COUPLE METHOD

When investigating the diffusion layers grown by the reaction couple m ethod at the Ni-Zn interface at 350 and 400 degrees C, the homogeneity ranges of the delta and gamma phases were found to be 87.5 +/- 0.2 to 89.0 +/- 0.2 at.% Zn and 73.1 +/- 0.3 to 86.2 +/- 0.3 at.% Zn, respec tively. Chemical compositions of the phases investigated can therefore be expressed in the simplest form as delta NiZn7 to 8 and gamma NiZn3 to 6.