Heat capacities and thermodynamic properties of CuxZn1-xSiF6·6H2O (x=1, 0.06, and 0) from 14 to 300 K

A. M. Bykov; V. E. Ganenko; V. I. Markovich; F. A. Shteingart; G. A. Tsintsadze

doi:10.1016/0021-9614(79)90137-X

Heat capacities and thermodynamic properties of Cu_xZn_1-xSiF₆·6H₂O (x=1, 0.06, and 0) from 14 to 300 K

A. M. Bykov, V. E. Ganenko, V. I. Markovich, F. A. Shteingart, G. A. Tsintsadze

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

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Abstract

The heat capacities of CuSiF₆·6H₂O, ZnSiF₆·6H₂O, and their solid solution Cu_0.06Zn_0.94 SiF₆·6H₂O were determined by adiabatic calorimetry in the temperature range 14 to 300 K. The heat capacity at constant pressure C_p^o(298.15 K), the entropy difference {S^o(298.15 K)-S^o(0)}, the enthalpy difference {H^o(298.15 K)-H^o(0)}, and the function -{G^o(298.15 K)-H^o(0)} 298.15 K were found to be 373.5 J K^-1 mol^-1, 367.3 J K^-1 mol^-1, 59240 J mol^-1, and 168.6 J K^-1 mol^-1, respectively, for CuSiF₆·6H₂O. For ZnSiF₆·6H₂O these functions are 428.6 J K^-1 mol^-1, 437.0 J K^-1 mol^-1, 69330 J mol^-1, and 204.5 J K^-1 mol^-1, respectively. Thermodynamic properties of the solution Cu_0.06Zn_0.94SiF₆·6H₂O coincide with those for ZnSiF₆·6H₂O within experimental error. An anomaly in the heat capacity of CuSiF₆·6H₂O was observed at T = (294.9±0.2) K. The origin of the anomaly seems to be a phase transition (cooperative Jahn-Teller effect).

Original language	English
Pages (from-to)	1065-1073
Number of pages	9
Journal	Journal of Chemical Thermodynamics
Volume	11
Issue number	11
DOIs	https://doi.org/10.1016/0021-9614(79)90137-X
State	Published - 1 Jan 1979
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science (all)
Physical and Theoretical Chemistry

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10.1016/0021-9614(79)90137-X

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@article{a07f453c39174d12bb21f7cc95b7103d,

title = "Heat capacities and thermodynamic properties of CuxZn1-xSiF6·6H2O (x=1, 0.06, and 0) from 14 to 300 K",

abstract = "The heat capacities of CuSiF6·6H2O, ZnSiF6·6H2O, and their solid solution Cu0.06Zn0.94 SiF6·6H2O were determined by adiabatic calorimetry in the temperature range 14 to 300 K. The heat capacity at constant pressure Cpo(298.15 K), the entropy difference {So(298.15 K)-So(0)}, the enthalpy difference {Ho(298.15 K)-Ho(0)}, and the function -{Go(298.15 K)-Ho(0)} 298.15 K were found to be 373.5 J K-1 mol-1, 367.3 J K-1 mol-1, 59240 J mol-1, and 168.6 J K-1 mol-1, respectively, for CuSiF6·6H2O. For ZnSiF6·6H2O these functions are 428.6 J K-1 mol-1, 437.0 J K-1 mol-1, 69330 J mol-1, and 204.5 J K-1 mol-1, respectively. Thermodynamic properties of the solution Cu0.06Zn0.94SiF6·6H2O coincide with those for ZnSiF6·6H2O within experimental error. An anomaly in the heat capacity of CuSiF6·6H2O was observed at T = (294.9±0.2) K. The origin of the anomaly seems to be a phase transition (cooperative Jahn-Teller effect).",

author = "Bykov, {A. M.} and Ganenko, {V. E.} and Markovich, {V. I.} and Shteingart, {F. A.} and Tsintsadze, {G. A.}",

year = "1979",

month = jan,

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doi = "10.1016/0021-9614(79)90137-X",

language = "English",

volume = "11",

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journal = "Journal of Chemical Thermodynamics",

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TY - JOUR

T1 - Heat capacities and thermodynamic properties of CuxZn1-xSiF6·6H2O (x=1, 0.06, and 0) from 14 to 300 K

AU - Bykov, A. M.

AU - Ganenko, V. E.

AU - Markovich, V. I.

AU - Shteingart, F. A.

AU - Tsintsadze, G. A.

PY - 1979/1/1

Y1 - 1979/1/1

N2 - The heat capacities of CuSiF6·6H2O, ZnSiF6·6H2O, and their solid solution Cu0.06Zn0.94 SiF6·6H2O were determined by adiabatic calorimetry in the temperature range 14 to 300 K. The heat capacity at constant pressure Cpo(298.15 K), the entropy difference {So(298.15 K)-So(0)}, the enthalpy difference {Ho(298.15 K)-Ho(0)}, and the function -{Go(298.15 K)-Ho(0)} 298.15 K were found to be 373.5 J K-1 mol-1, 367.3 J K-1 mol-1, 59240 J mol-1, and 168.6 J K-1 mol-1, respectively, for CuSiF6·6H2O. For ZnSiF6·6H2O these functions are 428.6 J K-1 mol-1, 437.0 J K-1 mol-1, 69330 J mol-1, and 204.5 J K-1 mol-1, respectively. Thermodynamic properties of the solution Cu0.06Zn0.94SiF6·6H2O coincide with those for ZnSiF6·6H2O within experimental error. An anomaly in the heat capacity of CuSiF6·6H2O was observed at T = (294.9±0.2) K. The origin of the anomaly seems to be a phase transition (cooperative Jahn-Teller effect).

AB - The heat capacities of CuSiF6·6H2O, ZnSiF6·6H2O, and their solid solution Cu0.06Zn0.94 SiF6·6H2O were determined by adiabatic calorimetry in the temperature range 14 to 300 K. The heat capacity at constant pressure Cpo(298.15 K), the entropy difference {So(298.15 K)-So(0)}, the enthalpy difference {Ho(298.15 K)-Ho(0)}, and the function -{Go(298.15 K)-Ho(0)} 298.15 K were found to be 373.5 J K-1 mol-1, 367.3 J K-1 mol-1, 59240 J mol-1, and 168.6 J K-1 mol-1, respectively, for CuSiF6·6H2O. For ZnSiF6·6H2O these functions are 428.6 J K-1 mol-1, 437.0 J K-1 mol-1, 69330 J mol-1, and 204.5 J K-1 mol-1, respectively. Thermodynamic properties of the solution Cu0.06Zn0.94SiF6·6H2O coincide with those for ZnSiF6·6H2O within experimental error. An anomaly in the heat capacity of CuSiF6·6H2O was observed at T = (294.9±0.2) K. The origin of the anomaly seems to be a phase transition (cooperative Jahn-Teller effect).

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U2 - 10.1016/0021-9614(79)90137-X

DO - 10.1016/0021-9614(79)90137-X

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AN - SCOPUS:49249147494

SN - 0021-9614

VL - 11

SP - 1065

EP - 1073

JO - Journal of Chemical Thermodynamics

JF - Journal of Chemical Thermodynamics

IS - 11

ER -

Heat capacities and thermodynamic properties of Cu_xZn_1-xSiF₆·6H₂O (x=1, 0.06, and 0) from 14 to 300 K

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