Küchler R, Bauer T, Brando M, Steglich F
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
Rev Sci Instrum. 2012 Sep;83(9):095102. doi: 10.1063/1.4748864.
We describe the design, construction, calibration, and two different applications of a miniature capacitance dilatometer. The device is suitable for thermal expansion and magnetostriction measurements from 300 K down to about 25 mK, with a resolution of 0.02 Å at low temperatures. The main body of the dilatometer is fabricated from a single block of a Be-Cu alloy by electrical discharge milling. This creates an extremely compact high-resolution measuring cell. We have successfully tested and operated dilatometers of this new type with the commonly used physical property measurement system by quantum design, as well as with several other cryogenic refrigeration systems down to 25 mK and in magnetic fields up to 20 T. Here, the capacitance is measured with a commercially available capacitance bridge. Using a piezoelectric rotator from Attocube Systems, the cell can be rotated at T = 25 mK inside of an inner vacuum chamber of 40 mm diameter. The miniaturized design for the one-axis rotation setup allows a rotation of 360°.
我们描述了一种微型电容膨胀仪的设计、构造、校准及两种不同应用。该装置适用于从300 K到约25 mK的热膨胀和磁致伸缩测量，在低温下分辨率为0.02 Å。膨胀仪的主体由一块铍铜合金通过电火花铣削加工而成。这造就了一个极其紧凑的高分辨率测量单元。我们已成功使用量子设计公司常用的物理性质测量系统以及其他几种低温制冷系统，在低至25 mK且磁场高达20 T的条件下对这种新型膨胀仪进行了测试和操作。在此，电容由商用电容电桥测量。使用阿托库伯系统公司的压电旋转器，该单元可在直径40 mm的内部真空腔室内于T = 25 mK时进行旋转。单轴旋转装置的小型化设计允许360°旋转。
