A Preliminary X-Ray Study of Binary Alloys of Platinum with Cobalt, Molybdenum and Tungsten

Abstract
At the composition PtCo there exists a tetragonal superlattice with the AuCu structure. It is stable at 600°C, but forms a face-centered-cubic disordered phase at 1000°C. It is the incipient formation of this superlattice which is responsible for the superlative remanence and coercivity reported by Jellinghaus. At 400°C a body-centered-cubic phase begins to form. More than 50 atomic percent molybdenum and more than 35 atomic percent tungsten are soluble in platinum at 1000°C.

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