Simultaneous measurements of heat capacity and pressure coefficient of liquid He4 and He3 - He4 mixtures

✍ Scribed by T. Takada; M. Okaji; J. Yuyama; H. Suzuki; T. Watanabe

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 470 KB
• Volume: 21
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(81)90230-7

✦ Synopsis

An apparatus for simultaneous measurements of heat capacities and pressure coefficients was designed and constructed for experimental studies of critical phenomena near the lambda points of liquid He 4 and He 3 -He 4 mixtures.

The pressure was measured with a capacitance pressure sensor involving a copperberyllium thin plate (0.4 mm thickness). An oscillator circuit, including the capacitance pressure sensor, and driven by a tunnel diode was attached to the bottom of the calorimeter. The resolutions of temperature and pressure in this apparatus are ~2 x 10 -7 K and ~2 x 10-s bar ('~2 x 10 -1 N m -2) respectively.