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A miniature capacitance dilatometer for thermal expansion and magnetostriction

Rev. Sci. Instrum. 69, 2742 (1998); doi:10.1063/1.1149009

Issue Date: July 1998

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M. Rotter, H. Müller, and E. Gratz
Institut für Experimentalphysik, Technical University Vienna, Wiedner Hauptstr 8-10, 1040 Wien, Austria

M. Doerr and M. Loewenhaupt
Institut für Angewandte Physik und Didaktik, University of Technology Dresden, Mommsenstr 13, 01069 Dresden, Germany
A very small capacitive sensor for measuring thermal expansion and magnetostriction of small and irregular shaped samples has been developed. A capacitive method with tilted plates is used. The tilted plate capacitance formula is used for the calculation of the capacitor gap, the calibration is performed by measuring the signal of a standard material. The active length of the sample can be less than 1 mm. The absolute resolution is about 1 Å. All mechanical connections of the dilatometer are carried out by tiny Cu–Be springs, enabling the small force on the sample to be adjusted (50–500 mN) and no additional sample fixing is necessary. The cell has been tested in the temperature range 0.3–200 K and in static magnetic fields up to 15 T. The zero signal of the dilatometer has been determined by measuring a silver sample. The correct operation and reproducibility has been verified by measuring the thermal expansion of Cu. The thermal expansion and magnetostriction of a DyCu2 single crystal has been determined. The advantage of this method compared to specific heat measurements is that a large temperature range can be covered with one equipment. This high static and dynamic range of sample length, temperature, and magnetic field suggests a number of possible applications, like the investigation of crystal field effects on the magnetoelastic properties of single crystals or structural phase transitions. ©1998 American Institute of Physics.
History: Received 15 December 1997; accepted 9 April 1998
Permalink: http://link.aip.org/link/?RSINAK/69/2742/1
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KEYWORDS and PACS

Keywords
PACS
  • 06.30.Bp
    Metrology, measurements, and laboratory procedures Measurements common to several branches of physics and astronomy Spatial dimensions (e.g., position, lengths, volume, angles, displacements, including nanometer-scale displacements)
  • 07.20.Ym
    Instruments, apparatus, components, and techniques common to several branches of physics and astronomy Thermal instruments, apparatus, and techniques Other thermal instruments and techniques
  • 07.55.Yv
    Instruments, apparatus, components, and techniques common to several branches of physics and astronomy Magnetic components, instruments and techniques Other magnetic instruments and techniques
  • 07.07.Df
    Instruments, apparatus, components, and techniques common to several branches of physics and astronomy General equipment and techniques Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
  • 65.70.+y
    Thermal properties of condensed matter Thermal expansion and density changes; thermomechanical effects
  • 75.80.+q
    Magnetic properties and materials Magnetomechanical and magnetoelectric effects, magnetostriction
  • YEAR: 1998

PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
Publisher:
AIP is a member of CrossRef AIP

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