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Heat capacity and entropy at the temperatures 5 K to 720 K and thermal expansion from the temperatures 298 K to 573 K of synthetic enargite (Cu3AsS4)

✍ Scribed by Robert R. Seal; II; Richard A. Robie; Bruce S. Hemingway; Howard T. Evans; Jr.

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
374 KB
Volume
28
Category
Article
ISSN
0021-9614

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✦ Synopsis

The heat capacity of synthetic Cu3AsS4 (enargite) was measured by quasi-adiabatic calorimetry from the temperatures 5 K to 355 K and by differential scanning calorimetry from T=339 K to T=720 K. Heat-capacity anomalies were observed at T=(58.520.5)

The causes of the anomalies are unknown. At T=298.15 K, C°p,m and S°m(T ) are (190.4 2 0.2) J•K -1 •mol -1 and (257.6 2 0.6) J•K -1 •mol -1 , respectively. The superambient heat capacities are described from T=298.15 K to T=944 K by the least-squares regression equation: C°p,m/(J•K -1 •mol -1 ) = (196.7 2 1.2) + (0.0499 2 0.0016)•(T/K) -(1918 000284 000)•(T/K) -2 . The thermal expansion of synthetic enargite was measured from T=298.15 K to T=573 K by powder X-ray diffraction. The thermal expansion of the unit-cell volume (Z=2) is described from T=298.15 K to T=573 K by the least-squares equation: V/pm 3 =10 6 •(288.220.2)+10 4 •(1.4920.04)•(T/K).

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