Temperature and Magnetic Field Induced Phase Transformation in Bulk and Composite Gd5Si2Ge2

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

Research output: Journal article publicationConference articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

A -1300ppm strain has been obtained in a [0-3], resin binder, Gd5Si2Ge2participate 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 ≤ 600μm. Bulk Gd5Si2Ge2was 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.
Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5053
DOIs
Publication statusPublished - 27 Nov 2003
Externally publishedYes
EventPROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Smart Structures and Materials 2003 Active Materials: Behavior and Mechanics - San Diego, CA, United States
Duration: 3 Mar 20036 Mar 2003

Keywords

  • [0-3] Composites
  • Gd Si Ge 5 2 2
  • Phase transformationy
  • Volume Magnetostriction

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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