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The 9. 355 GHz complex permittivity of light and heavy water from 1 to 90 C using an improved high-precision instrumentation system

The 9. 355 GHz complex permittivity of light and heavy water from 1 to 90 C using an improved high-precision instrumentation system,10.1021/je00016a00

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The 9. 355 GHz complex permittivity of light and heavy water from 1 to 90 C using an improved high-precision instrumentation system   (Citations: 4)
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Recent improvements to a high-precision instrumentation system for measuring the complex permittivity of high loss liquids using a variable-length transmission sample cell at microwave frequencies are described. An error analysis for this system is given. These improvements have enabled the complex permittivity of heavy water and of double-distilled, deionized light water to be measured with a typical accuracy of [+-] 0.1% for [epsilon][prime] and [+-] 0.2% for [epsilon][double prime] and a precision of about 0.02% at 9.355 GHz in the temperature interval from approximately 1 to 90 C in increments of about 2.5 C. The values of [epsilon][prime](t) and [epsilon][double prime](t) have been fitted to empirical quintic polynomials in the temperature t ([degree]C). The temperature dependences of the Gibbs free energy, enthalpy, and entropy of activation parameters for the relaxation process as well as the relaxation time have been calculated from both the [epsilon][prime](t) and [epsilon][double prime](t) data sets for both light and heavy water.
Journal: Journal of Chemical and Engineering Data - J CHEM ENG DATA , vol. 39, no. 4, pp. 625-638, 1994
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