High-pressure structural studies of LixLa1/3NbO3(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

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1 Scopus citations


The high-pressure behavior of LixLa1/3NbO3(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 B0′ ~4) when in the crystalline phase, whereas La1/3NbO3shows a linear volume contraction versus pressure, i.e., B0′ ~(-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 NbO6octahedra. The pressure evolution of the Nb oxidation state is discussed.

Original languageEnglish
Pages (from-to)333-340
Number of pages8
JournalPhysics and Chemistry of Minerals
Issue number5
StatePublished - 1 May 2014


  • Lanthanide oxides
  • Perovskite
  • Pressure-induced amorphization

ASJC Scopus subject areas

  • General Materials Science
  • Geochemistry and Petrology


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