Abstract
A multi-purpose automated dilatometer has been developedfor simultaneous measurements of the expansion/contraction under theeffects of magnetic field and/or mechanical stress and/ortemperature. The differential capacitive position sensor, operatingtogether with the microprocessor controlled digital transformerbridge, is used as a displacement transducer with the resolution ofseveral tens of nanometres. Measurements are accomplished in thetemperature range from -150 to 200 °C. The automaticallycontrolled variation of the applied magnetic field is provided by theelectromagnet with the field homogeneity of 0.5×10-5 ofthe magnetic field strength (maximum 1.1 T). A special controllingsystem is developed for the automated mechanical loading of thesample under investigation. Some examples of the measurementscompleted on the magnetic shape memory alloy Ni2MnGa arepresented for three cases: (i) strain as a function of the appliedmagnetic field; (ii) creep under constant magnetic field ormechanical stress; and (iii) phase transformations duringheating/cooling with and without the applied magnetic field.
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