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The structure of vapour deposited alloys of iron with platinum and palladium.

Rangiha, J. (1989) The structure of vapour deposited alloys of iron with platinum and palladium. Doctoral thesis, University of Surrey (United Kingdom)..

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The structure of Fe[x] - Pd[1-x] (0.85>x>0.5) and Fe[x] - Pt[1-x] (0.85>x>0.3) thin film alloys co-deposited from the vapour phase over substrate temperatures (T[s]) ranging over 200-700°C have been examined at room temperature, using X-Ray, Microprobe, TEM and SEM techniques. The sequence of phases developed as T[s] is changed have been explained in terms of three factors: a) The structure of the initial phase, which in turn is a function of the T[o] temperature where DeltaG[bcc-fcc]=0 b) Diffusion at the designated temperature, which depends on both T[s] and the rate of deposition. c) Further transformations which occur on cooling through critical ordering or martensite start temperatures. Based on the co-deposited thin film results, a model is proposed which facilitates the determination of alloy phase diagrams. A direct determination of T[o] temperature in certain composition ranges is also possible through vapour deposition techniques. Preliminary calculation of T[o] confirms the experimental results and the role played by magnetic contributions. The combined experimental data for Fe-Pt alloys confirm the earlier assumption of a eutectoid transformation at about 17at% Pt at around 600°C and provides evidence of the efficacy of thin films for the rapid assessment of low temperature equilibria.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
Rangiha, J.
Date : 1989
Contributors :
Additional Information : Thesis (Ph.D.)--University of Surrey (United Kingdom), 1989.
Depositing User : EPrints Services
Date Deposited : 22 Jun 2018 14:25
Last Modified : 06 Nov 2018 16:53

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