Enthalpies of formation of alloys in the pseudobinary LaAlxNi5-x system

R. Klein; P. A.G. O’Hare; I. Jacob

doi:10.1006/jcht.2000.0701

Enthalpies of formation of alloys in the pseudobinary LaAl_xNi_5-x system

R. Klein, P. A.G. O’Hare, I. Jacob

Unit of Nuclear Engineering

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The pseudobinary system LaAl_xNi_5-x has a composition limit at x ≈ 1.4. The standard molar enthalpies of formation Δ_fH_m^o(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 Δ_fH_m^o(LaNi₅) fall into two groups; they are compared with the present determination. The plot of Δ_fH_m^o against x is linear within experimental error.

Original language	English
Pages (from-to)	1607-1615
Number of pages	9
Journal	Journal of Chemical Thermodynamics
Volume	32
Issue number	12
DOIs	https://doi.org/10.1006/jcht.2000.0701
State	Published - 1 Jan 2000

Keywords

Alloy
Aluminum
Formation enthalpy
Lanthanum
Nickel

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
General Materials Science
Physical and Theoretical Chemistry

Access to Document

10.1006/jcht.2000.0701

Cite this

@article{6272e8f889b24688ad26c26f02f2cf97,

title = "Enthalpies of formation of alloys in the pseudobinary LaAlxNi5-x system",

abstract = "The pseudobinary system LaAlxNi5-x has a composition limit at x ≈ 1.4. The standard molar enthalpies of formation ΔfHmo(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 ΔfHmo(LaNi5) fall into two groups; they are compared with the present determination. The plot of ΔfHmo against x is linear within experimental error.",

keywords = "Alloy, Aluminum, Formation enthalpy, Lanthanum, Nickel",

author = "R. Klein and O{\textquoteright}Hare, {P. A.G.} and I. Jacob",

note = "Funding Information: This work was partly supported by the Israeli Council of Higher Education.",

year = "2000",

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doi = "10.1006/jcht.2000.0701",

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volume = "32",

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T1 - Enthalpies of formation of alloys in the pseudobinary LaAlxNi5-x system

AU - Klein, R.

AU - O’Hare, P. A.G.

AU - Jacob, I.

N1 - Funding Information: This work was partly supported by the Israeli Council of Higher Education.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - The pseudobinary system LaAlxNi5-x has a composition limit at x ≈ 1.4. The standard molar enthalpies of formation ΔfHmo(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 ΔfHmo(LaNi5) fall into two groups; they are compared with the present determination. The plot of ΔfHmo against x is linear within experimental error.

AB - The pseudobinary system LaAlxNi5-x has a composition limit at x ≈ 1.4. The standard molar enthalpies of formation ΔfHmo(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 ΔfHmo(LaNi5) fall into two groups; they are compared with the present determination. The plot of ΔfHmo against x is linear within experimental error.

KW - Alloy

KW - Aluminum

KW - Formation enthalpy

KW - Lanthanum

KW - Nickel

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