β Scribed by A.T. Donaldson; Rees D. Rawlings
No coin nor oath required. For personal study only.
Experimental density and lattice parameter measurements have been made on the B2 compound NiGa, covering the composition range 47.2-54.6 at.?/, Ni. Theoretical densities were calculated for several types of constitutional defect model based on the experimentally determined lattice parameter values. A comparison of the compositional dependence of the theoretical density with the experimentally observed trend showed that the constitutional defect structure of NiGa was best represented by a model which consisted of nickel anti-structure atoms Nior and nickel vacancies &. The model prechcts that these defects are present simultaneously in varying fractions in all alloy compositions throughout the phase field of the compound and that no abrupt changeover in defect type occurs at the stoichiometric composition. The compositional dependence of a theoretical lattice parameter, calculated from the defect model, was found to be in good agreement with the experimental observations. showing the proposed defect model to be self-consistent.
π SIMILAR VOLUMES
## Abstract Nd~2~PdSi~3~ single crystals were grown by a vertical floating zone method with radiation heating at a zone traveling rate of 3 mm/h. The compound exhibits congruent melting behavior at a liquidus temperature of about 1790 Β°C. The actual crystal composition (35.3 Β± 0.5) at.% Nd, (16.2 Β±