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

doi:10.1007/s00269-013-0652-y

High-pressure structural studies of Li_xLa_1/3NbO₃(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

Department of Physics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The high-pressure behavior of Li_xLa_1/3NbO₃(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 La_1/3NbO₃shows 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 language	English
Pages (from-to)	333-340
Number of pages	8
Journal	Physics and Chemistry of Minerals
Volume	41
Issue number	5
DOIs	https://doi.org/10.1007/s00269-013-0652-y
State	Published - 1 May 2014

Keywords

Lanthanide oxides
Perovskite
Pressure-induced amorphization

ASJC Scopus subject areas

General Materials Science
Geochemistry and Petrology

Access to Document

10.1007/s00269-013-0652-y

Cite this

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title = "High-pressure structural studies of LixLa1/3NbO3(x = 1/6, 1/3, 1/2, 2/3)",

abstract = "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.",

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author = "O. Noked and A. Melchior and R. Shuker and S. Chizawa and Liermann, {H. P.} and Kennedy, {B. J.} and M. Nakayama and E. Sterer",

year = "2014",

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doi = "10.1007/s00269-013-0652-y",

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T1 - High-pressure structural studies of LixLa1/3NbO3(x = 1/6, 1/3, 1/2, 2/3)

AU - Noked, O.

AU - Melchior, A.

AU - Shuker, R.

AU - Chizawa, S.

AU - Liermann, H. P.

AU - Kennedy, B. J.

AU - Nakayama, M.

AU - Sterer, E.

PY - 2014/5/1

Y1 - 2014/5/1

N2 - 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.

AB - 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.

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