guder_2009

C. Guder and W. Wagner, “A Reference Equation of State for the Thermodynamic Properties of Sulfur Hexafluoride (SF6) for Temperatures from the Melting Line to 625 K and Pressures up to 150 MPa”, J. Phys. Chem. Ref. Data 38, 33 (2009)

Source record · Catalogue · Review register

DOI: 10.1063/1.3037344

Source kind: fit

Recorded technique: A reference Helmholtz-energy equation of state for sulfur hexafluoride from the melting line to 625 K and 150 MPa, fitted to selected thermodynamic data, with an ideal-gas part fitted to statistical-mechanics heat capacities.

Materials in structured entries: SF6

Dataset quantities: None recorded.

Contents: 0 datasets; 1 formula.

Curation notes

Identity VALIDATED_WITH_WARNINGS by the library: its text layer has 269 unmapped glyphs, and the tables of pdf pp. 25 and 39-58 are not certified by the extraction. Nothing is taken from those pages. Pages cited are pdf pages.

IDEAL GAS AND CONSTANTS: M = 146.0554192 g/mol (Loss et al. 2003) and R = 8.314472 J/(mol K) (pdf p. 60); T_c = 318.7232 K. The ideal-gas heat capacity (Eq. 15, pdf p. 21; Table 21, pdf p. 22, checked against the table image) is c_p0/R = 1 + n3 + sum_{i=4}^{6} n_i (theta_i tau)^2 exp(theta_i tau)/(exp(theta_i tau) - 1)^2, tau = T_c/T, with n3 = 3, n4..n6 = 3.661182320, 7.878851030, 3.459816790 and theta4..theta6 = 1.617282065, 2.747115139, 4.232907175. It reproduces its input data to 6000 K within 0.001 %.

AGAINST COOLPROP 8.0.0 (reference key Guder-JPCRD-2009): the same M and R, and Eq. (15) to 2e-16 at 230-625 K (computed 2026-09-30).

Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets

No datasets are recorded.

Formulas

guder_2009/eq15

{
  "id": "eq15",
  "material": "SF6",
  "equation": "Eq. (15), pdf p. 21; Table 21, pdf p. 22",
  "printed": "c_p0/R = 1 + n3 + sum_{i=4}^{6} n_i (theta_i tau)^2 exp(theta_i tau)/(exp(theta_i tau) - 1)^2",
  "variable": "tau = T_c/T, T_c = 318.7232 K",
  "range": "the melting line to 625 K",
  "coefficients": {
    "n3": "3.000000000",
    "n4": "3.661182320",
    "n5": "7.878851030",
    "n6": "3.459816790",
    "theta4": "1.617282065",
    "theta5": "2.747115139",
    "theta6": "4.232907175",
    "critical_temperature": "318.7232"
  },
  "check": "CoolProp 8.0.0 equals it to 2e-16 (tests/test_transport.py)."
}

Corrections

No dataset errata are recorded in this source record.

Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the review register for the checks and decisions.