engleski

An assessment of a new type of capacitance dilatometer for measurement of the thermal expansion of solids between 273 and 620 K

The construction of an apparatus for measuring the thermal expansion of solids, based on the three-terminal capacitor method, in the temperature range between 273 and 620 K is described. The device enables measurements to be made on samples regardless of their shape, size, conductivity or dielectric constant. The operating range can easily be extended down to 77 K requiring no changes in essential parts. Replacement of the sample is easy and fast with no need to dismantle the capacitor. The minimal change in length of the sample that can be resolved is 0.3 nm, which yields the sensitivity of 2 x IO^(-6) for a 100 micro-m long sample. The dilatometer has been calibrated using silicon, palladium and copper as the reference materials. The thermal exDansion coefficient can be determined with an accuracy of +/- 1.5%

capacitance dilatometer; thermal expansion

nije evidentirano