National Technical Reports Library - NTRL

National Technical Reports Library


Details
Actions:
Download PDFDownload XML
Download

High-Temperature Enthalpies and Entropies of Chalcopyrite and Bornite.


PB196683

Publication Date 1970
Personal Author Pankratz, L. B.; King, E. G.
Page Count 14
Abstract Enthalpies were determined for synthetic chalcopyrite (CuFeS2) between 298 and 1,050K and for synthetic bornite (Cu5FeS4) between 298 and 1,100K by copper-block drop calorimetry. Two transitions were found for each compound. The lower transitions were both crystal transformations from tetragonal (low-temperature form) to cubic (high-temperature form). The chalcopyrite transformation occurred at 830K with a heat of transformation of 2,405 cal/mole; the bornite transformation was at 485K with a heat of 1,430 cal/mole. The other transitions were of the second order and were presumed to be magnetic in character. Enthalpy increments, entropy increments, and heat capacities are tabulated at even temperatures above 298.15K. Equations of enthalpy are also given. (Author)
Keywords
  • Copper ores
  • Thermodynamic properties
  • Chalcopyrite
  • Iron ores
  • Sulfide minerals
  • Iron sulfides
  • Enthalpy
  • Entropy
  • Tables(Data)
  • Bornite
  • Copper sulfides
Source Agency
  • Invalid Source Agency Code
NTIS Subject Category
  • 99D - Basic & Synthetic Chemistry
  • 99F - Physical & Theoretical Chemistry
  • 48F - Geology & Geophysics
Corporate Authors BUREAU OF Mines, Washington, D.C.
Document Type Technical Report
Title Note Rept. of investigations.
NTIS Issue Number 197105
High-Temperature Enthalpies and Entropies of Chalcopyrite and Bornite.
High-Temperature Enthalpies and Entropies of Chalcopyrite and Bornite.
PB196683

  • Copper ores
  • Thermodynamic properties
  • Chalcopyrite
  • Iron ores
  • Sulfide minerals
  • Iron sulfides
  • Enthalpy
  • Entropy
  • Tables(Data)
  • Bornite
  • Copper sulfides
  • Invalid Source Agency Code
  • 99D - Basic & Synthetic Chemistry
  • 99F - Physical & Theoretical Chemistry
  • 48F - Geology & Geophysics
Loading