copeland_1976

T. G. Copeland and R. H. Cole, “Dielectric and pressure virial coefficients of imperfect gases. VII. CF3H-Ar and CFH3-Ar mixtures”, J. Chem. Phys. 64, 1747 (1976)

Source record · Catalogue · Review register

DOI: 10.1063/1.432350

Source kind: measurement

Recorded technique: Relative permittivity of CF3H-Ar and CFH3-Ar mixtures (and pure argon) at 50.0 degrees C (NBS-calibrated thermometer, 0.1 degrees C absolute; gradients < 0.05 degrees C): three-terminal parallel-plate cells (Orcutt and Cole; 98 pF, stable to 2 ppm) and a transformer bridge (General Radio 1493, 0.1 ppm relative). B_eps/A_eps^2 from the cyclic expansion method with two or three cells from 40-200 atm; A_eps and B_p from low-pressure data (Texas Instruments 0-100 psi quartz spiral gauge), [(eps - 1)/(eps + 2)](RT/P) = A_eps + (B_eps - A_eps B_p)(P/RT) (Eq. 2). Mixture viscosities at 25 degrees C by a capillary viscometer (pp. 2-3).

Materials in structured entries: Ar

Dataset quantities: molar_refractivity, refractivity_virial_coefficient

Contents: 3 datasets; 0 formulas.

Curation notes

Identity checked against the first page (pdf page 1 is the publisher’s cover; journal pp. 1747-1751 = pdf pages 2-6). Page numbers below are pdf pages.

SCOPE. Argon only: CF3H and CFH3 are not curated species. Table I’s first row (mole fraction 0) is pure argon: this work’s A_eps = 4.1406 +- 0.0014 cm^3/mole and, in parentheses, Bose and Cole’s (1970) A_eps = 4.1396 +- 0.0006 and B_eps = 0.72 +- 0.12 cm^6/mole^2 (footnote a: ‘Values from T. K. Bose and R. H. Cole, J. Chem. Phys. 52, 140 (1970)’; bose_1970, whose A_eps is 4.1397 +- 0.0006: re-pointed 2026-09-27); this work’s pure-argon B_eps and C_eps are not given (’...’). The text (p. 2) uses ‘A_eps1 = 4.140 cm^3/mole for argon’ to compute the mixtures’ mole fractions. ‘The small differences are accounted for by slight irreproducibility of the cells used by Sutter and a suspected slight impurity of the CFH3 used in this work’ (p. 3; said of the pure components generally).

WHAT A_eps IS. f = (eps - 1)/(eps + 2) = A_eps (n/V) + B_eps (n/V)^2 + ... (Eq. 1), static (bridge frequency); for argon the electronic static polarizability. B_eps is the static dielectric second virial coefficient (for argon an induction term only, no orientation part).

UNCERTAINTY. The +- of Tables I and II are not described anywhere in the paper (level ‘not stated’); the group’s other papers quote three standard deviations.

Not extracted: the mixture rows of Tables I and II (A_eps, B_eps, C_eps, B_p), argon’s B_p (-11.6 +- 1.5 cm^3/mole, no quantity), the mixed B_eps12 and B_p12, the viscosities (Table III: argon 226.2 x 1e-6 P at 25 degrees C) and Table IV’s model parameters (argon alpha = 1.64e-24 cm^3, an input to the calculations; 4.1406 cm^3/mol is 1.6413e-24 cm^3, computed 2026-09-26).

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

Datasets

copeland_1976/A_eps_Ar

{
  "id": "A_eps_Ar",
  "material": "Ar",
  "file": "Ar/copeland_1976__A_eps_Ar.csv",
  "table": "tbl_a066d6e5d380",
  "quantity": "molar_refractivity",
  "unit": "cm3/mol",
  "abscissa_unit": "nm",
  "use": "check",
  "uncertainty": {
    "column": true,
    "level": "not stated"
  },
  "parameters": {
    "temperature_k": 323.15
  }
}

Table I, mole fraction 0 (pure argon): A_eps = 4.1406 +- 0.0014 cm^3/mole at 50 degrees C (row = temperature, K), this work, static dielectric: the electronic polarizability of argon. 0.03 % below schmidt_2003’s 4.14203 (19). A check. Level not stated.

copeland_1976/A_eps_bose_cole_Ar

{
  "id": "A_eps_bose_cole_Ar",
  "material": "Ar",
  "file": "Ar/copeland_1976__A_eps_bose_cole_Ar.csv",
  "table": "tbl_a066d6e5d380",
  "quantity": "molar_refractivity",
  "unit": "cm3/mol",
  "abscissa_unit": "nm",
  "use": "reproduced",
  "reproduced_from": [
    "bose_1970"
  ],
  "uncertainty": {
    "column": true,
    "level": "3 sigma"
  }
}

Table I, pure argon, in parentheses (footnote a): A_eps = 4.1396 +- 0.0006 cm^3/mole, Bose and Cole (1970) = bose_1970 (re-pointed 2026-09-27), static dielectric. The original prints 4.1397 +- 0.0006 at 49.7 degrees C: this reprint is one lower in the last digit (image of both tables checked; kept as printed). The original’s errors are three standard deviations: level corrected to ‘3 sigma’.

copeland_1976/B_eps_bose_cole_Ar

{
  "id": "B_eps_bose_cole_Ar",
  "material": "Ar",
  "file": "Ar/copeland_1976__B_eps_bose_cole_Ar.csv",
  "table": "tbl_a066d6e5d380",
  "quantity": "refractivity_virial_coefficient",
  "unit": "cm6/mol2",
  "abscissa_unit": "nm",
  "use": "reproduced",
  "reproduced_from": [
    "bose_1970"
  ],
  "uncertainty": {
    "column": true,
    "level": "3 sigma"
  },
  "parameters": {
    "order": 2
  }
}

Table I, pure argon, in parentheses (footnote a): B_eps = 0.72 +- 0.12 cm^6/mole^2, Bose and Cole (1970) = bose_1970 (re-pointed 2026-09-27; its 49.7 degrees C value, digit for digit): the static dielectric second virial coefficient (for argon, induction only). The original’s errors are three standard deviations: level corrected to ‘3 sigma’.

Formulas

No formulas are recorded.

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.