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21 July 2004 Forced volume magnetostriction in composite Gd5Si2Ge2
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Abstract
A -1200 ppm forced volume magnetostriction has been obtained in a [0-3], resin-bonded, Gd5Si2Ge2 particulate composite. The strain is a result of a magnetically induced phase transformation from a high volume (high temperature, low magnetic field) monoclinic phase to a low volume (low temperature, high magnetic field) orthorhombic phase. The particles used in the composite were ball-milled from a bulk sample and sieved to obtain a size distribution of ≤600 mm. Bulk Gd5Si2Ge2 was manufactured via arc melting and subsequently annealed at 1300°C for 1 hour to produce a homogenous, polycrystalline sample. The transformation temperatures of the bulk sample, as measured using a Differential Scanning Calorimeter (DSC), were Ms = -9.3°C, Mf = -14.6°C, As = -4.4°C, and Af = -1.2°C. The composite and the bulk samples were magnetically characterized using a SQUID magnetometer, and found to undergo a paramagnetic to ferromagnetic transition during the phase transformation, consistent with published results. The bulk sample was also found to possess a maximum linear magnetostriction of -2500 ppm.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nersesse Nersessian, Siu Wing Or, Gregory P. Carman, Scott McCall, Wonyoung Choe, Harry B. Radousky, Vitalij K. Pecharsky, and Alexandra O. Pecharsky "Forced volume magnetostriction in composite Gd5Si2Ge2", Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); https://doi.org/10.1117/12.540176
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