Piezoelectric-based uniaxial pressure cell with integrated force and displacement sensors

Area of Science:

• Materials Science
• Condensed Matter Physics
• Mechanical Engineering

Background:

• Accurate mechanical characterization of materials under stress is essential for understanding their properties.
• Existing stress cells may have limitations in temperature range or force/displacement measurement precision.

Purpose of the Study:

• To design and present a piezoelectric-driven uniaxial stress cell for materials testing.
• To incorporate both displacement and force sensors for precise mechanical analysis.
• To enable testing at both ambient and cryogenic temperatures.

Main Methods:

• A piezoelectric actuator was used to drive uniaxial stress application.
• Integrated displacement and force sensors were incorporated into the cell design.
• The stress cell was tested using the oxide metal Sr2RuO4 at room and cryogenic temperatures (5 K).

Main Results:

• The stress cell has a diameter of 46 mm and height of 13 mm.
• It can apply a displacement of up to ~45 μm and a force of up to ~245 N.
• For Sr2RuO4, plastic deformation initiated at ~0.2 GPa at room temperature, but remained elastic up to ~2 GPa at 5 K.

Conclusions:

• The developed stress cell allows for precise determination of material elastic limits by combining force and displacement data.
• The in situ tuning capability, applying force after cooling, is highlighted as a key advantage for cryogenic experiments.
• The results demonstrate significant temperature-dependent changes in the elastic and plastic behavior of Sr2RuO4.