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Enthalpies of formation of alloys in the pseudobinaryLaAlxNi5 − x system

✍ Scribed by R. Klein; P.A.G. O’Hare; I. Jacob

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
128 KB
Volume
32
Category
Article
ISSN
0021-9614

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✦ Synopsis

The pseudobinary system LaAl x Ni 5-x has a composition limit at x ≈ 1.4. The standard molar enthalpies of formation f H o m (298.15 K) for this system were determined by solution calorimetry in HCl (c = 6 mol • dm -3 ) to be: -(129.4 ± 6.5) kJ • mol -1 for x = 0; -(159.5 ± 15.9) kJ • mol -1 for x = 0.25; -(185.9 ± 6.7) kJ • mol -1 for x = 0.375; -(191.8±12.4) kJ • mol -1 for x = 0.5; and -(283.2±8.9) kJ • mol -1 for x = 1. Uncertainties correspond to twice the standard deviation of the mean and include contributions from the scatter of the calorimetric results and electrical calibrations, as well as analytical uncertainties. Previous results for f H o m (LaNi 5 ) fall into two groups; they are compared with the present determination. The plot of f H o m against x is linear within experimental error.

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