Physics and Chemistry of Minerals

, Volume 41, Issue 5, pp 333–340 | Cite as

High-pressure structural studies of Li x La1/3NbO3 (x = 1/6, 1/3, 1/2, 2/3)

  • O. Noked
  • A. Melchior
  • R. Shuker
  • S. Chizawa
  • H. P. Liermann
  • B. J. Kennedy
  • M. Nakayama
  • E. Sterer
Original Paper

Abstract

The high-pressure behavior of Li x La1/3NbO3 (x = 1/6, 1/3, 1/2, 2/3) perovskites where Li cations were substituted for the existing vacancies was studied using synchrotron X-ray diffraction. It was shown that all these materials undergo irreversible pressure-induced amorphization around 14.5 GPa regardless of the Li concentration. The Li-inserted materials were found to exhibit a standard pressure response (bulk modulus pressure derivative B 0′ ~4) when in the crystalline phase, whereas La1/3NbO3 shows a linear volume contraction versus pressure, i.e., B 0′ ~(−1). These results suggest that the structural collapse is not a consequence of cation disorder resulting from the Nb atoms (B-site) migrating to the A-site vacancies. The observed pressure response can be understood by increased occupancy of the A-sites opposing the tilting of the NbO6 octahedra. The pressure evolution of the Nb oxidation state is discussed.

Keywords

Pressure-induced amorphization Perovskite Lanthanide oxides 

Notes

Acknowledgments

Portions of this research were carried out at beamline P02.2 of the light source PETRA III at DESY, a member of the Helmholtz Association (HGF).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • O. Noked
    • 1
    • 2
  • A. Melchior
    • 1
  • R. Shuker
    • 2
  • S. Chizawa
    • 3
  • H. P. Liermann
    • 4
  • B. J. Kennedy
    • 5
  • M. Nakayama
    • 3
  • E. Sterer
    • 1
    • 6
  1. 1.Physics Department, Nuclear Research CentreNegevBeer ShevaIsrael
  2. 2.Physics DepartmentBen-Gurion UniversityBeer ShevaIsrael
  3. 3.Department of Material Science and EngineeringNagoya Institute of TechnologyNagoyaJapan
  4. 4.Petra III, P02Deutsches Elektronen SynchrotronHamburgGermany
  5. 5.School of ChemistryThe University of SydneySydneyAustralia
  6. 6.Physics DepartmentHarvard UniversityCambridgeUSA

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