Report of Investigations 8973: Electrochemical Determination of Thermodynamic Properties of MnF₂ and CoF₂

Details

• Journal Article:
  Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8973
• Personal Author:
  Schaefer, Seth C.
• Description:
  The Bureau of Mines investigated the standard Gibbs energies of formation, AGF deg., for MnF2 (manganese difluoride) and CoF2 (cobalt difluoride). High-temperature galvanic cells employing CaF2 (calcium difluoride) as the solid electrolyte were used to measure the open-circuit potentials for the cell reactions Mn(c) + NiF2(c) = MnF2(c) + Ni(c) and Co(c) + NiF2(c) = CoF2(c) + Ni(c). Combination of the standard Gibbs energy changes for these reactions with the standard Gibbs energy of formation of NiF2 yielded the following: AGF deg. (MnF2) = (-203,008 + 30.96T)+/-560(745.7-1,078.3 K) and AGF deg. (CoF2) = (-159,090 + 32.13T)+/-420 (769.5-1,026.8 K), where AGF deg. is expressed in calories per mol (1 cal = 4.184J) and T is expressed in kelvins. The standard enthalpies of formation deltaHF deg., Derived by the third-law method, are deltaHF deg. 298(Mnf2) = -204, 633+/-560 cal/mol and deltaHF deg. 298(Cof2) = -161,166+/-420 cal/mol. [Description provided by NIOSH]
• Subjects:
  Chemistry Mining Occupational Health Safety
• Source:
  Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8973, 1985 Jan; :1-8
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Publisher:
  U.S. Department of the Interior, Bureau of Mines
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  Oregon ; OSHA Region 10
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  ALRC - Albany Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  13 pdf pages
• NIOSHTIC Number:
  nn:10004725
• Federal Fiscal Year:
  1985
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:371890790138bf24addb7861d2b1045171d3bec9431f5e14f33b87eaaf5c501ca4760a59c2d5f907f108d9accc9742118a374628a8577de76bfa89c3581d2808
• Download URL:
  https://stacks.cdc.gov/view/cdc/10450/cdc_10450_DS1.pdf
• File Type:
  [PDF - 545.75 KB ]