Accurate measurement of thermal expansion of solids between 77 K and 350 K by 3-terminal capacitance method
- 46 Downloads
The construction of a three-terminal capacitance cell and a bath type cryostat to measure thermal expansion of solids in the temperature range 77 K to 350 K is described. Calculation of the thermal expansion coefficients by using spline approximation is discussed along with the various errors involved in the measurement. The capacitance cell is calibrated by using aluminium and germanium as standard reference materials. The cell has an accuracy of 4% in the measurement of thermal expansion coefficient and a resolution of 1 Å change in length of sample of length 1 cm.
KeywordsThermal expansion low temperature three-terminal capacitance method
PACS Nos07.20 65.70
Unable to display preview. Download preview PDF.
- Krishnan R S, Srinivasan R and Devanarayanan S 1979Thermal expansion of crystals (Oxford: Pergamon)Google Scholar
- Krishnapur P P 1983Development of three-terminal capacitance bridge system for thermal expansion studies between 77K and 350K, Ph.D. thesis, Indian Institute of Science, Bangalore, IndiaGoogle Scholar
- Thompson A M 1958IRE Trans. Instrum. 17 245Google Scholar
- Touloukian Y S, Kirby R K, Taylor R E and Lee T Y R 1975TPRC Data Series, Thermophysical properties of matter (London: Plenum) Vol. 13Google Scholar