P Bloembergen et al 2007 Metrologia 44 279 doi:10.1088/0026-1394/44/5/004
P Bloembergen1, Y Yamada1, N Sasajima1, Y Wang1 and T Wang2
Show affiliationsThis paper deals with the evaluation of the uncertainty in the equilibrium value of the eutectic temperature of the eutectic systems Fe–C and Co–C in their pure state. The first step towards this is deriving the equilibrium value of the liquidus temperature of the actual impure system and its associated uncertainty, the second estimating the uncertainty in the correction for the effect of impurities. The derivation of liquidus temperature and its uncertainty from the observed melting behaviour forms the core of this study. It involves the extrapolation of the measured melting plateaus, obtained at finite growth rates of the preceding freezes, towards the plateau related to zero growth rate, i.e. to the state of structural thermodynamic equilibrium. The uncertainty in the correction for the effect of impurities will be evaluated by means of 'the sum of individual estimates' and 'the overall maximum estimate', earlier shown to be applicable to eutectic systems.
81.30.Dz Phase diagrams of other materials
Issue 5 (October 2007)
Received 27 February 2007
Published 12 September 2007
P Bloembergen et al 2007 Metrologia 44 279
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