13 August 2003 Temperature- and magnetic-field-induced phase transormation in bulk and cmoposite Gd5Si2Ge2
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Abstract
A -1300ppm strain has been obtained in a [0-3], resin binder, Gd5Si2Ge2 particulate composite. The strain is a result of a temperature 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 were sieved to obtain a size distribution of <600micron. Bulk Gd5Si2Ge2 was manufactured via arc melting and subsequently annealed at 1300°C for 1 hour to produce a textured, 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 bulk sample was 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 -8000ppm volume magnetostriction, agreeing well with measured unit cell parameters of the different phases.
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Nersesse Nersessian, Siu Wing Or, Gregory Paul Carman, Wonyoung Choe, Harry B. Radousky, Vitalij K. Pecharsky, and Alexandra O. Pecharsky "Temperature- and magnetic-field-induced phase transormation in bulk and cmoposite Gd5Si2Ge2", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.484719; https://doi.org/10.1117/12.484719
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