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Proceedings Paper

Temperature- and magnetic-field-induced phase transformation in bulk and composite Gd5Si2Ge2
Author(s): Nersesse Nersessian; Siu Wing Or; Gregory Paul Carman; Wonyoung Choe; Harry B. Radousky; Vitalij K. Pecharsky; Alexandra O. Pecharsky
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Paper 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.

Paper Details

Date Published: 13 August 2003
PDF: 6 pages
Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.484719
Show Author Affiliations
Nersesse Nersessian, Univ. of California, Los Angeles (United States)
Lawrence Livermore National Lab. (United States)
Siu Wing Or, Univ. of California, Los Angeles (United States)
Gregory Paul Carman, Univ. of California, Los Angeles (United States)
Wonyoung Choe, Lawrence Livermore National Lab. (United States)
Harry B. Radousky, Lawrence Livermore National Lab. (United States)
Vitalij K. Pecharsky, Iowa State Univ. (United States)
Alexandra O. Pecharsky, Iowa State Univ. (United States)


Published in SPIE Proceedings Vol. 5053:
Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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