Forced volume magnetostriction in composite Gd5Si2Ge2

Nersesse Nersessian; Siu Wing Or; Gregory P. Carman; Scott McCall; Wonyoung Choe; Harry B. Radousky; Vitalij K. Pecharsky; Alexandra O. Pecharsky

doi:10.1117/12.540176

21 July 2004 Forced volume magnetostriction in composite Gd₅Si₂Ge₂

Nersesse Nersessian, Siu Wing Or, Gregory P. Carman, Scott McCall, Wonyoung Choe, Harry B. Radousky, Vitalij K. Pecharsky, Alexandra O. Pecharsky

Author Affiliations +

Proceedings Volume 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics; (2004) https://doi.org/10.1117/12.540176
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

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.

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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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