Preparation, characterization, and some thermodynamic properties of lanthanum oxide carbide, La2O2C2

A. Duane Butherus; Harry A. Eick

doi:10.1016/0022-1902(73)80128-9

Preparation, characterization, and some thermodynamic properties of lanthanum oxide carbide, La₂O₂C₂

A. Duane Butherus, Harry A. Eick

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Abstract

A lanthanum oxide carbide of the general formula La₂O₂C₂ has been prepared in a carbon monoxide atmosphere by a variety of techniques. Preparations which were zone refined by slow passage of an arc over the sample yielded a crystalline phase which was monophasic both by X-ray diffraction and micrographic analysis. Vapor phase chromatographic analysis indicates the principal species of the acid hydrolysis product of this phase is acetylene. From a carbon monoxide equilibration study of the reaction, La₂O₃(s) + 3 C(s) = La₂O₂C₂(s) + CO(g) effected in a constant volume system the following data were obtained: ΔH°₂₉₈ = 82.₂±1.₉ kcal/gfw ΔS°₂₉₈ = 36.₇±3.₆ eu. Combination of these values with the appropriate thermodynamic data yields an elthalpy of formation of -320.₀±2.₀ kcal/gfw for La₂O₂C₂. A third law enthalpy is also calculated.

Original language	English (US)
Pages (from-to)	1925-1930
Number of pages	6
Journal	Journal of Inorganic and Nuclear Chemistry
Volume	35
Issue number	6
DOIs	https://doi.org/10.1016/0022-1902(73)80128-9
State	Published - Jun 1973
Externally published	Yes

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@article{c206bbb12dd744cabef9db8816e8faba,

title = "Preparation, characterization, and some thermodynamic properties of lanthanum oxide carbide, La2O2C2",

abstract = "A lanthanum oxide carbide of the general formula La2O2C2 has been prepared in a carbon monoxide atmosphere by a variety of techniques. Preparations which were zone refined by slow passage of an arc over the sample yielded a crystalline phase which was monophasic both by X-ray diffraction and micrographic analysis. Vapor phase chromatographic analysis indicates the principal species of the acid hydrolysis product of this phase is acetylene. From a carbon monoxide equilibration study of the reaction, La2O3(s) + 3 C(s) = La2O2C2(s) + CO(g) effected in a constant volume system the following data were obtained: ΔH°298 = 82.2±1.9 kcal/gfw ΔS°298 = 36.7±3.6 eu. Combination of these values with the appropriate thermodynamic data yields an elthalpy of formation of -320.0±2.0 kcal/gfw for La2O2C2. A third law enthalpy is also calculated.",

author = "{Duane Butherus}, A. and Eick, {Harry A.}",

note = "Funding Information: Acknowledgement-The authors acknowledge gratefully the support of the U.S. Atomic Energy Commission, contract AT( 11 - 1)-716.",

year = "1973",

month = jun,

doi = "10.1016/0022-1902(73)80128-9",

language = "English (US)",

volume = "35",

pages = "1925--1930",

journal = "Journal of Inorganic and Nuclear Chemistry",

issn = "0022-1902",

publisher = "Elsevier Limited",

number = "6",

}

TY - JOUR

T1 - Preparation, characterization, and some thermodynamic properties of lanthanum oxide carbide, La2O2C2

AU - Duane Butherus, A.

AU - Eick, Harry A.

N1 - Funding Information: Acknowledgement-The authors acknowledge gratefully the support of the U.S. Atomic Energy Commission, contract AT( 11 - 1)-716.

PY - 1973/6

Y1 - 1973/6

N2 - A lanthanum oxide carbide of the general formula La2O2C2 has been prepared in a carbon monoxide atmosphere by a variety of techniques. Preparations which were zone refined by slow passage of an arc over the sample yielded a crystalline phase which was monophasic both by X-ray diffraction and micrographic analysis. Vapor phase chromatographic analysis indicates the principal species of the acid hydrolysis product of this phase is acetylene. From a carbon monoxide equilibration study of the reaction, La2O3(s) + 3 C(s) = La2O2C2(s) + CO(g) effected in a constant volume system the following data were obtained: ΔH°298 = 82.2±1.9 kcal/gfw ΔS°298 = 36.7±3.6 eu. Combination of these values with the appropriate thermodynamic data yields an elthalpy of formation of -320.0±2.0 kcal/gfw for La2O2C2. A third law enthalpy is also calculated.

AB - A lanthanum oxide carbide of the general formula La2O2C2 has been prepared in a carbon monoxide atmosphere by a variety of techniques. Preparations which were zone refined by slow passage of an arc over the sample yielded a crystalline phase which was monophasic both by X-ray diffraction and micrographic analysis. Vapor phase chromatographic analysis indicates the principal species of the acid hydrolysis product of this phase is acetylene. From a carbon monoxide equilibration study of the reaction, La2O3(s) + 3 C(s) = La2O2C2(s) + CO(g) effected in a constant volume system the following data were obtained: ΔH°298 = 82.2±1.9 kcal/gfw ΔS°298 = 36.7±3.6 eu. Combination of these values with the appropriate thermodynamic data yields an elthalpy of formation of -320.0±2.0 kcal/gfw for La2O2C2. A third law enthalpy is also calculated.

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U2 - 10.1016/0022-1902(73)80128-9

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AN - SCOPUS:0004742012

SN - 0022-1902

VL - 35

SP - 1925

EP - 1930

JO - Journal of Inorganic and Nuclear Chemistry

JF - Journal of Inorganic and Nuclear Chemistry

IS - 6

ER -

Preparation, characterization, and some thermodynamic properties of lanthanum oxide carbide, La₂O₂C₂

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