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Title: Electron spin resonance and magnetic characterization of the Gd{sub 5.09}Ge{sub 2.03}Si{sub 1.88}

Abstract

Electron spin resonance was applied on samples of Gd{sub 5.09}Ge{sub 2.03}Si{sub 1.88}. The results are discussed under the scope of magnetization measurements, optical metallography, and wavelength dispersive spectroscopy. Polycrystalline arc-melted samples submitted to different heat treatments were investigated. The correlation of the electron spin resonance and magnetization results permitted a characterization of the present phases and their transitions. Two coexisting phases in the temperature range between two phase transitions have been identified and associated to distinct crystallographic phases. Additionally, the magnetic moment at high temperatures has been estimated from the measured effective g factor. A peak value of 21.5 J/kg K for the magnetocaloric effect was obtained for a sample heat treated at 1500 deg. C for 16 h.

Authors:
; ; ; ; ;  [1]
  1. Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, Unicamp, Cx. P. 6165, 13083-970, Campinas, Sao Paulo (Brazil)
Publication Date:
OSTI Identifier:
20787759
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 72; Journal Issue: 22; Other Information: DOI: 10.1103/PhysRevB.72.224435; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CORRELATIONS; ELECTRON SPIN RESONANCE; GADOLINIUM ALLOYS; GERMANIUM ALLOYS; HEAT TREATMENTS; LANDE FACTOR; MAGNETIC MOMENTS; MAGNETIZATION; PARAMAGNETISM; PHASE TRANSFORMATIONS; POLYCRYSTALS; SILICON ALLOYS; SPECTROSCOPY; WAVELENGTHS

Citation Formats

Pires, M.J.M., Carvalho, A. Magnus G., Gama, S., Silva, E.C. da, Coelho, A.A., and Mansanares, A.M. Electron spin resonance and magnetic characterization of the Gd{sub 5.09}Ge{sub 2.03}Si{sub 1.88}. United States: N. p., 2005. Web. doi:10.1103/PHYSREVB.72.2.
Pires, M.J.M., Carvalho, A. Magnus G., Gama, S., Silva, E.C. da, Coelho, A.A., & Mansanares, A.M. Electron spin resonance and magnetic characterization of the Gd{sub 5.09}Ge{sub 2.03}Si{sub 1.88}. United States. doi:10.1103/PHYSREVB.72.2.
Pires, M.J.M., Carvalho, A. Magnus G., Gama, S., Silva, E.C. da, Coelho, A.A., and Mansanares, A.M. Thu . "Electron spin resonance and magnetic characterization of the Gd{sub 5.09}Ge{sub 2.03}Si{sub 1.88}". United States. doi:10.1103/PHYSREVB.72.2.
@article{osti_20787759,
title = {Electron spin resonance and magnetic characterization of the Gd{sub 5.09}Ge{sub 2.03}Si{sub 1.88}},
author = {Pires, M.J.M. and Carvalho, A. Magnus G. and Gama, S. and Silva, E.C. da and Coelho, A.A. and Mansanares, A.M.},
abstractNote = {Electron spin resonance was applied on samples of Gd{sub 5.09}Ge{sub 2.03}Si{sub 1.88}. The results are discussed under the scope of magnetization measurements, optical metallography, and wavelength dispersive spectroscopy. Polycrystalline arc-melted samples submitted to different heat treatments were investigated. The correlation of the electron spin resonance and magnetization results permitted a characterization of the present phases and their transitions. Two coexisting phases in the temperature range between two phase transitions have been identified and associated to distinct crystallographic phases. Additionally, the magnetic moment at high temperatures has been estimated from the measured effective g factor. A peak value of 21.5 J/kg K for the magnetocaloric effect was obtained for a sample heat treated at 1500 deg. C for 16 h.},
doi = {10.1103/PHYSREVB.72.2},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 22,
volume = 72,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 2005},
month = {Thu Dec 01 00:00:00 EST 2005}
}