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A cell has been designed and built for measurement of the dielectric constant and dissipation factor of thin films. The principle employed is the two-fluid, three-terminal scheme, 1,2, 3 adapted to thin film measurements. Measurements of dielectric constant, dissipation factor and thickness can be obtained on films ranging from about 250 μm (10 mil) down to 1 μm (0. 04 mil). Agreement is in general...
Accurate measurements of dielectric properties of materials by the three-terminal air-gap method require accurate knowledge of the area of the electrodes. The expression giving the dielectric constant can be put in the form equation (1) where equation Equation (1) can be solved for A, giving equation The two fluid method enables us to measure the dielectric constant of a specimen without knowledge...
The study of the long-time effects of humidity change on the dielectric properties of dielectric materials was for the most part made on disk specimens from 2 to 5 mm thick which were cut down to a diameter of about 4 cm for measurement in micrometer electrode holders and on which evaporated metal (usually gold) electrodes were applied. Most of the results described in this paper were obtained on...
Recently developed transformer bridges have made it possible to easily make measurements of capacitance to a few ppm (parts per million), particularly at audio frequencies. The question naturally arises: can dielectric constant and phase angle measurements be made with comparable accuracy?
The Standards Group within the Dielectrics Section of the National Bureau of Standards has undertaken an investigation with the object of producing a set of Standard Specimens with well-defined dielectric constant and loss index. An important attribute of such a group of specimens is that their electrical properties should not be subject to unpredictable change as a function of environment or time...
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