Thermodynamics of the Lanthanide Trifluorides. I. The Heat Capacity of Lanthanum Trifluoride, LaF₃ from 5 to 350°K and Enthalpies from 298 to 1477°K

William G. Lyon; Darrell W. Osborne; Howard E. Flotow; Fernande Grandjean; Ward N. Hubbard; Gerald K. Johnson

doi:10.1063/1.436381

Thermodynamics of the Lanthanide Trifluorides. I. The Heat Capacity of Lanthanum Trifluoride, LaF₃ from 5 to 350°K and Enthalpies from 298 to 1477°K

William G. Lyon
, Darrell W. Osborne
, Howard E. Flotow
, Fernande Grandjean
, Ward N. Hubbard
, Gerald K. Johnson

Chemistry

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

Abstract

The heat capacity of a sample of LaF ₃ was determined in the temperature range 5-350°K by aneroid adiabatic calorimetry and the enthalpy from 298.15 to 1477°K by drop calorimetry. The heat capacity at constant pressure C° _p (298.15°K), the entropy S°(298.15°K), the enthalpy [H°(298.15°K)-H°(0)] and the Planck function -[G°(298.15°K)-H°(0)]/298.15°K; were found to be (90.29±0.09) J °K ^-1 ·mole ^-1 , (106.98±0.11) J °K ^-1 ·mole ^-1 , (16717±17) J mole ^-1 , and (50.91±0.05) J °K ^-1 ·mole ^-1 . The thermal functions from the present research were extended up to the melting temperature (1766°K) by combination with previously published results. The anomalously high heat capacity from about 1100 to 1766°K is discussed.

Original language	American English
Journal	Journal of Chemical Physics
Volume	69
DOIs	https://doi.org/10.1063/1.436381
State	Published - Jul 1 1978

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Chemistry

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@article{20b1cabddaa3422396b34e6677a20537,

title = "Thermodynamics of the Lanthanide Trifluorides. I. The Heat Capacity of Lanthanum Trifluoride, LaF₃ from 5 to 350°K and Enthalpies from 298 to 1477°K",

abstract = " The heat capacity of a sample of LaF 3 was determined in the temperature range 5-350°K by aneroid adiabatic calorimetry and the enthalpy from 298.15 to 1477°K by drop calorimetry. The heat capacity at constant pressure C° p (298.15°K), the entropy S°(298.15°K), the enthalpy [H°(298.15°K)-H°(0)] and the Planck function -[G°(298.15°K)-H°(0)]/298.15°K; were found to be (90.29±0.09) J °K -1 ·mole -1 , (106.98±0.11) J °K -1 ·mole -1 , (16717±17) J mole -1 , and (50.91±0.05) J °K -1 ·mole -1 . The thermal functions from the present research were extended up to the melting temperature (1766°K) by combination with previously published results. The anomalously high heat capacity from about 1100 to 1766°K is discussed.",

author = "Lyon, \{William G.\} and Osborne, \{Darrell W.\} and Flotow, \{Howard E.\} and Fernande Grandjean and Hubbard, \{Ward N.\} and Johnson, \{Gerald K.\}",

year = "1978",

month = jul,

day = "1",

doi = "10.1063/1.436381",

language = "American English",

volume = "69",

journal = "Journal of Chemical Physics",

}

TY - JOUR

T1 - Thermodynamics of the Lanthanide Trifluorides. I. The Heat Capacity of Lanthanum Trifluoride, LaF₃ from 5 to 350°K and Enthalpies from 298 to 1477°K

AU - Lyon, William G.

AU - Osborne, Darrell W.

AU - Flotow, Howard E.

AU - Grandjean, Fernande

AU - Hubbard, Ward N.

AU - Johnson, Gerald K.

PY - 1978/7/1

Y1 - 1978/7/1

N2 - The heat capacity of a sample of LaF 3 was determined in the temperature range 5-350°K by aneroid adiabatic calorimetry and the enthalpy from 298.15 to 1477°K by drop calorimetry. The heat capacity at constant pressure C° p (298.15°K), the entropy S°(298.15°K), the enthalpy [H°(298.15°K)-H°(0)] and the Planck function -[G°(298.15°K)-H°(0)]/298.15°K; were found to be (90.29±0.09) J °K -1 ·mole -1 , (106.98±0.11) J °K -1 ·mole -1 , (16717±17) J mole -1 , and (50.91±0.05) J °K -1 ·mole -1 . The thermal functions from the present research were extended up to the melting temperature (1766°K) by combination with previously published results. The anomalously high heat capacity from about 1100 to 1766°K is discussed.

AB - The heat capacity of a sample of LaF 3 was determined in the temperature range 5-350°K by aneroid adiabatic calorimetry and the enthalpy from 298.15 to 1477°K by drop calorimetry. The heat capacity at constant pressure C° p (298.15°K), the entropy S°(298.15°K), the enthalpy [H°(298.15°K)-H°(0)] and the Planck function -[G°(298.15°K)-H°(0)]/298.15°K; were found to be (90.29±0.09) J °K -1 ·mole -1 , (106.98±0.11) J °K -1 ·mole -1 , (16717±17) J mole -1 , and (50.91±0.05) J °K -1 ·mole -1 . The thermal functions from the present research were extended up to the melting temperature (1766°K) by combination with previously published results. The anomalously high heat capacity from about 1100 to 1766°K is discussed.

UR - https://scholarsmine.mst.edu/chem_facwork/831

U2 - 10.1063/1.436381

DO - 10.1063/1.436381

M3 - Article

VL - 69

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

ER -

Thermodynamics of the Lanthanide Trifluorides. I. The Heat Capacity of Lanthanum Trifluoride, LaF₃ from 5 to 350°K and Enthalpies from 298 to 1477°K

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