Calorimetric studies and thermodynamic properties of liquid Ag-Ca alloys
PBN-AR
Instytucja
Instytut Metalurgii i Inżynierii Materiałowej im. Aleksandra Krupkowskiego Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
JOURNAL OF CHEMICAL THERMODYNAMICS
ISSN
0021-9614
EISSN
Wydawca
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI
Rok publikacji
2014
Numer zeszytu
Strony od-do
159-166
Numer tomu
77
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0,44
Autorzy
(liczba autorów: 2)
Słowa kluczowe
EN
Molar mixing enthalpy; Silver–calcium system; Ag–Ca; Calorimetry; Thermochemistry
Streszczenia
Język
EN
Treść
Integral molar enthalpies of mixing were determined by drop calorimetric method for Ag–Ca liquid alloys at temperatures (1254 and 1131) K using a Setaram MHTC 96 Line evo calorimeter. Measurements were conducted for alloys of concentrations between 0.0642 ⩽ XCa ⩽ 0.9396 at T = 1254 K and at 1131 K between 0.7564 ⩽ XCa ⩽ 0.9647. The obtained values are negative in the entire range of concentrations and the minimum of the integral enthalpy of mixing equal –24609 J/mol of atoms was observed for 0.4634 mol fraction of calcium at T = 1254 K. The analysis of experimental data showed that most probably ΔHm of Ag–Ca liquid alloys is independent of temperature and that they are almost twice less exothermic than those ones by the partial pressure measurements. Based on the data of this study and that available in the literature, the interaction parameters of Redlich–Kister equation for the liquid Ag–Ca phase were evaluated. The concentration fluctuation structure factor Scc(0) calculated using drawn up in this study equation showed the swallow minimum between Ca concentrations appropriate for Ag9Ca2 and AgCa intermetallic phases what can suggest at two kind of associates in liquid solutions.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
669570
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