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New applications for the world’s smallest high-precision capacitance dilatometer and its stress-implementing counterpart

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We introduce a new stress dilatometer with exactly the same size and mass as the world’s smallest miniature capacitance dilatometer (height × width × depth = 15 × 14 ×… Click to show full abstract

We introduce a new stress dilatometer with exactly the same size and mass as the world’s smallest miniature capacitance dilatometer (height × width × depth = 15 × 14 × 15 mm3, mass: 12 g). To develop this new device, only a single part of the most recently developed mini-dilatometer, the so-called “body,” needs to be replaced. Therefore, the new mini-dilatometer with an interchangeable body can be used for high-resolution measurements of thermal expansion and magnetostriction with and without large stress. We also report two novel applications of both mini-dilatometer cell types. Our new setup was installed for the first time in a cryogen-free system (PPMS DynaCool). The first new setup allows the rotation of both dilatometers in situ at any angle between −90° ≥ μ ≥ +90° in the temperature range from 320 to 1.8 K. We also installed our mini-cells in a dilution refrigerator insert of a PPMS DynaCool, in which dilatometric measurements are now possible in the temperature range from 4 to 0.06 K. Because of the limited sample space, such measurements could not be performed so far. For both new applications, we can resolve the impressive length changes to 0.01 Å.

Keywords: stress; dilatometer; world smallest; new applications; capacitance dilatometer

Journal Title: Review of Scientific Instruments
Year Published: 2023

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