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Pressure-induced structural transitions in Tb-pyrochlore oxides

Appl. Phys. Lett. 88, 031903 (2006); doi:10.1063/1.2165212

Published 17 January 2006

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Ravhi S. Kumar, Andrew L. Cornelius, and Malcolm F. Nicol
High Pressure Science and Engineering Center (HiPSEC) and Department of Physics, University of Nevada Las Vegas, Las Vegas, Nevada 89154

Kinson C. Kam and Anthony K. Cheetham
Materials Research Laboratory, University of California, Santa Barbara, California 93106

Jason S. Gardner
NIST, Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562 and Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000
The structure of Tb2Ti2O7, Tb2Sn2O7, and Tb2TiSnO7 were studied at high pressures (P<1  Mbar) using synchrotron radiation and angular dispersive x-ray diffraction. The cubic lattice was shown to distort into a monoclinic phase before exhibiting total structural disorder (amorphization) in all three samples. Our experiments demonstrate that partial replacement of Sn with Ti significantly enhances the bulk modulus and increases the structural stability (crystalline state) to much higher pressures. Furthermore, pressure induces anion before cation disorder during the order-disorder transition. These results are compared to radiation damage studies that show order-disorder transitions. ©2006 American Institute of Physics
History: Received 5 October 2005; accepted 28 November 2005; published 17 January 2006
Permalink: http://link.aip.org/link/?APPLAB/88/031903/1
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KEYWORDS and PACS

Keywords
PACS
  • 62.50.+p
    High-pressure and shock wave effects in solids and liquids
  • 64.70.Kb
    Solid–solid transitions
  • 81.30.Hd
    Constant-composition solid–solid phase transformations: polymorphic, massive, and order–disorder
  • 81.40.Jj
    Elasticity and anelasticity, stress-strain relations
  • 62.20.Dc
    Elasticity, elastic constants
  • YEAR: 2006

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ISSN:
0003-6951 (print)   1077-3118 (online)
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