Abstract
Theoretical predictions make the Bi x Pd 1− x system a promising candidate for studying the possibility of amorphization by an enforced extension of the solubility into a metastable regime. By quench-condensation of Bi 30Pd 70, the existence of a previously unknown amorphous (a–) phase is proven, which above 520 K crystallizes into the monoclinic Bi 2Pd 5 phase. Ar +-irradiation of this crystalline phase at low temperatures leads back into the a-phase in accordance with a general amorphization rule. Experimentally, this behaviour is demonstrated by applying in situ resistance measurements and ex situ XRD. A surprising result is found for supersaturated Pd 70Bi 30 solid solutions, which can be prepared by exploiting interface reactions in Pd/Bi multilayers. Ion irradiation performed on these cubic metastable solid solutions under exactly the same conditions as above, result only in a segregation of the surplus Bi towards the equilibrium solubility limit. No irradiation induced amorphization can be obtained starting with a stable or metastable cubic solid solution.
Published Version
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