Klein, R.
, O'Hare, P.
and Jacob, I.
(2000),
Enthalpies of Formation in the Pseudobinary LaAl<sub>x</sub>Ni<sub>5-x</sub> System, Journal of Chemical Thermodynamics
(Accessed April 20, 2024)
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Enthalpies of Formation in the Pseudobinary LaAlxNi5-x System
Published
Author(s)
, P A. O'Hare, I Jacob
Abstract
The pseudobinary system LaAlxNi5-x has a composition limit at x {nearly equal to} 1.3. The standard molar enthalpies of formation fHm (298.15 K) were determined by solution calorimetry in HCl (c = 6 mol dm-3) to be -(129.4 +6.5) kJ mol-1 for x = 0.25; -(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. Previous results for δfHm (LaNi5) fall into two groups; they are compared with the present determination. The plot of δfHm against x is linear within experimental error. A minimum in the bond strength of Ni at x {nearly equal to} 0.2 shown by other techniques is not indicated by the δfHm s from the present measurements which, presumably, are not sufficiently sensitive to reveal it.Citation
Journal of Chemical Thermodynamics
Volume
32
Issue
No. 12
Pub Type
Journals
Keywords
aluminum, enthalpy, lanthanum, nickel
Citation
Created December 1, 2000, Updated February 17, 2017