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Title: Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe

Abstract

While near-zero thermal expansion (NZTE) in YbGaGe is sensitive to stoichiometry and defect concentration, the NZTE mechanism remains elusive. We present x-ray absorption spectra that show unequivocally that Yb is nearly divalent in YbGaGe and the valence does not change with temperature or with nominally 1% B or 5% C impurities, ruling out a valence-fluctuation mechanism. Moreover, substantial changes occur in the local structure around Yb with B and C inclusion. Together with inelastic neutron scattering measurements, these data indicate a strong tendency for the lattice to disorder, providing a possible explanation for NZTE in YbGaGe.

Authors:
 [1]; ;  [2];  [3];  [4];  [5]
  1. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  2. Department of Physics and Astronomy, University of California, Irvine, California 92697-4575 (United States)
  3. Physics Department, University of California, Davis, California 95616 (United States)
  4. Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  5. Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634 (United States)
Publication Date:
OSTI Identifier:
20976629
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevB.75.012301; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORON; CARBON; DEFECTS; GALLIUM COMPOUNDS; IMPURITIES; INELASTIC SCATTERING; NEUTRON DIFFRACTION; NEUTRON REACTIONS; STOICHIOMETRY; THERMAL EXPANSION; VALENCE; X-RAY SPECTRA; YTTERBIUM; YTTERBIUM COMPOUNDS

Citation Formats

Booth, C. H., Christianson, A. D., Lawrence, J. M., Pham, L. D., Lashley, J. C., and Drymiotis, F. R.. Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.012301.
Booth, C. H., Christianson, A. D., Lawrence, J. M., Pham, L. D., Lashley, J. C., & Drymiotis, F. R.. Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe. United States. doi:10.1103/PHYSREVB.75.012301.
Booth, C. H., Christianson, A. D., Lawrence, J. M., Pham, L. D., Lashley, J. C., and Drymiotis, F. R.. Mon . "Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe". United States. doi:10.1103/PHYSREVB.75.012301.
@article{osti_20976629,
title = {Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe},
author = {Booth, C. H. and Christianson, A. D. and Lawrence, J. M. and Pham, L. D. and Lashley, J. C. and Drymiotis, F. R.},
abstractNote = {While near-zero thermal expansion (NZTE) in YbGaGe is sensitive to stoichiometry and defect concentration, the NZTE mechanism remains elusive. We present x-ray absorption spectra that show unequivocally that Yb is nearly divalent in YbGaGe and the valence does not change with temperature or with nominally 1% B or 5% C impurities, ruling out a valence-fluctuation mechanism. Moreover, substantial changes occur in the local structure around Yb with B and C inclusion. Together with inelastic neutron scattering measurements, these data indicate a strong tendency for the lattice to disorder, providing a possible explanation for NZTE in YbGaGe.},
doi = {10.1103/PHYSREVB.75.012301},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}