Table of Dielectric Constants

1 NBS CIRCULAR 514AD-A278 9561111 IIIliii 11111 11111111111111111 lltlTable of Dielectric Constantsof Pure LiquidsDTICELECTESAPR 2 81994 UNITED STATES DEPARTMENT OF COMMERCENATIONAL BUREAU OF OF THE NATIONAL BUREAU OF STANDARDSAs the principal agency of the Federal Government for fundamental research in physics, chemistry,mathematics, and engineering, the National Bureau of Standards conducts projects in fourteen fields:electricity, optics, metrology, heat and power, atomic and radiation physics, chemistry, mechanics,organic and fibrous materials, metallurgy, mineral products, building technology, applied mathematics,electronics, and radio propagation. The Bureau has custody of the national standards of measurement,and conducts research leading to the improvement of scientific and engineering standards and of tech-niques and methods of measurement.

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4 Each issue, covering aperiod of one month, is released three months in advance and contains 16 large pages, including pertinentcharts, drawings, and tables. Annual subscription: domestic, $ ; foreign, $ all publications from the Superintendent of DocumentsU. S. Government Printing Office, Washington 25, D. ) STA ES) 'NEN'r OF COMMERCE *Charles Sawyer, SrcretaryNATIONAL. BUF AU OF STANDARD)S e E. U. Condon,, Dirtelo, Table of Dielectric Constantsof Pure LiquidsArthur A. Maryott and Edgar R. SmithAccesion ForNTIS CRAMiOTIC TABU nannouncedJustificationBy ..Distr ibution IAvailability CodesDist Avail and/ or-SpecialNational Bureau of Standards Circular 514 Issued August 10, 195194-12769 For ale by the S n n fDcu a.

5 O it e t a o ino2,V~~ 062 ContentsPage1. Introduction ------------- --------------------------------2. Description of Table List of svmhol .. Standard liquids ---------------------- Chemical formulas and the order of listing of substances Estimated accuracy of the values of fiielectric constant_- Variation of Dielectric constant with temperature ---------- Literature references in Table --------------------------Iv3. Table of Dielectric Constants ----------------------------A. Standard liquids- 7B. Inorganic liquids- ------------------- 8C. Organic liquids ---------------- ----------------------- 154. Bibliography ---------------------------------------- ----- 40I! Table of Dielectric Constants of Pure LiquidsArthur A.

6 Maryott and Edgar R. SmithThe "static" Dielectric Constants of more than 800 substances in the liquid state werecritically examined and tabulated ini concise form. Tihe Table consists of three sections: A,Standard Liquids; 13, Inorganic liquids; and (', Organic Liquids. An indication of the prob-able accuracy of the data is given. Wherever feasible, a simple analytical fuinction is em-ployed to express the variation of Dielectric constant with Introduction quency is given in a footnote. Temperature isthe only variable considered explicitly. UsuallyThis tabulation of the Dielectric Constants of the pressure is atmospheric or insignificantly differ-pure liquids is part of a program for a critical ex- ent with respect to its effect on Dielectric of the data of physics and chemistry, However, where data are listed at temperaturessponsored by the National Bureau of Standards in above the normal boiling point, the pressure cor-cooperation with the Committee on Tables of responds to the vapor pressure of the liquid unlessConstants and Numerical Data of the National indicated otherwise in a Council and the Commission on Tablesof Constants of the International Union of List of SymbolsChemistry.)

7 The preparation of additional tablesof the Dielectric Constants of gases, solids, aqueous I= Dielectric constant . (' C = I)t1= temperature, Celsius ( C)and nonaqueous solutions and mixtures, and of T=temperature, absolute (0K)dipole moments is in progress. a=-de/tThe assemblage and evaluation of the data a=-dlogio e/dthave been made entirely at the National Bureau f=frequency of alternating current in cycles perSbsecondof Standards with the assistance of 'I. Eden t1, t2=the limits of temperature between which a orduring the preliminary stages. However, helpful a is considered applicablesuggestions from M. E. Hobbs of Duke University, mp = melting pointC. P. Smyth of Princeton University, and the bp=boiling pointCommittees of the National Research Council Standard Liquidsand International Union of Chemistry are grate-fully acknowledged.

8 The compilations of P. Section A contains values of the Dielectric con-Debye and H. Sack (Tables de Constantes et stant at selected temperatures for 10 substancesDonn6es Numdriques XI, Fasicule 2, 1931-34; that are recommended as reference liquids becauseXII, Fasicule :32, 1935-:36 and earlier volumes of of their chemical stability, availability, and theTables Annuelles), International Critical Tables, reliability of the data. The probable 'accuracy isand Landolt-Bornstein Tabellen have been useful estimated to be about percent for methanolin checking the tables for accuracy and complete- and nitrobenzene and about percent in theness. In several instances data have been obtained remaining cases.

9 Values of a or a are includedfrom the Tables of Dielectric Materials, volume for interpolating or for extrapolating over aIII, prepared by the Laboratory of Insulation limited range of temperature without materiallyResearch, Massachusetts Institute of Technology, altering the accuracy. Additional (lata for theseCambridge, Mass., 1948. substances are contained in sections B or Description of the Table Chemical Formulas and the Order ofThe Table consists of three sections: A, Standard Listing SubstancesLiquids, B, Inorganic Liquids, C, Organic Liquids. Formulas for the inorganic substances areThe ( Dielectric Constants are intended to be the written in the usual manner. The order of listinglimiting values at low frequencies, the so-called compounds in section B is alphabetical according"static" values.))

10 Data obtained at such high fre- to the symbols for the elements in these formulasquencies that anomalous dispersion was evident with consideration also given to the number ofare not included. In questionable cases the fre- atoms of each INTRODUCTIONF ormulas for the organic compounds are written Variation of Dielectric constant Withwith carbon first and hydrogen, if present, second. TemperatureSymbols for all remaining elements then follow illalphabetical sequence The arrangement of these Where feasible, the variation of dielectriccompounds in section C is determined first by the constant with temperature is represented by onenumber of carbon atoms, secondliv b% tile nulnber of the following equations:of hydrogen atoms, and finally by thle symbols forthe remaining helements in alphal)etical order.