Pressure-induced amorphization of A-site-deficient double perovskite Ln1/3MO3 (Ln = Pr, Nd, M = Nb, Ta)

O. Noked; A. Melchior; R. Shuker; R. Steininger; B. J. Kennedy; E. Sterer

doi:10.1007/s00269-013-0622-4

Pressure-induced amorphization of A-site-deficient double perovskite Ln_1/3MO₃ (Ln = Pr, Nd, M = Nb, Ta)

O. Noked, A. Melchior, R. Shuker, R. Steininger, B. J. Kennedy, E. Sterer

Department of Physics

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

5 Scopus citations

Abstract

High-pressure X-ray diffraction measurements have demonstrated that the cation-deficient perovskites Pr_1/3NbO₃, Pr_1/3TaO₃, Nd_1/3NbO₃, and Nd_1/3TaO₃ undergo irreversible pressure-induced amorphization (PIA). This occurs near 14.5 GPa for the niobates and 18.5 GPa for the tantalates. The unit cell volumes of the four oxides show an almost linear decrease as the pressure is increased. It is concluded that the PIA transition occurs at higher pressures in the tantalates due to the lower MO₆ initial tilting at ambient conditions, which is associated with the larger atomic mass of the tantalum. The behavior of these oxides is compared to that of CaTiO₃, and the role of both the weakening of the M-O-M π-bonding and the cation vacancies on the observed structural changes is discussed.

Original language	English
Pages (from-to)	439-447
Number of pages	9
Journal	Physics and Chemistry of Minerals
Volume	41
Issue number	6
DOIs	https://doi.org/10.1007/s00269-013-0622-4
State	Published - 1 Jan 2014

Keywords

High pressure
Perovskite
Pressure-induced amorphization

ASJC Scopus subject areas

Materials Science (all)
Geochemistry and Petrology

Access to Document

10.1007/s00269-013-0622-4

Cite this

@article{c89b413d805641b3921017876ee2ca7b,

title = "Pressure-induced amorphization of A-site-deficient double perovskite Ln1/3MO3 (Ln = Pr, Nd, M = Nb, Ta)",

abstract = "High-pressure X-ray diffraction measurements have demonstrated that the cation-deficient perovskites Pr1/3NbO3, Pr1/3TaO3, Nd1/3NbO3, and Nd1/3TaO3 undergo irreversible pressure-induced amorphization (PIA). This occurs near 14.5 GPa for the niobates and 18.5 GPa for the tantalates. The unit cell volumes of the four oxides show an almost linear decrease as the pressure is increased. It is concluded that the PIA transition occurs at higher pressures in the tantalates due to the lower MO6 initial tilting at ambient conditions, which is associated with the larger atomic mass of the tantalum. The behavior of these oxides is compared to that of CaTiO3, and the role of both the weakening of the M-O-M π-bonding and the cation vacancies on the observed structural changes is discussed.",

keywords = "High pressure, Perovskite, Pressure-induced amorphization",

author = "O. Noked and A. Melchior and R. Shuker and R. Steininger and Kennedy, {B. J.} and E. Sterer",

note = "Funding Information: The authors acknowledge ANKA for granting beamtime at SUL-X. The research at ANKA received funding from the European Community{\textquoteright}s Seventh Framework Programme under Grant Agreement No 226716 (ELISA) for proposal CM 68. This work was partially supported by the Australian Research Council.",

year = "2014",

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doi = "10.1007/s00269-013-0622-4",

language = "English",

volume = "41",

pages = "439--447",

journal = "Physics and Chemistry of Minerals",

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T1 - Pressure-induced amorphization of A-site-deficient double perovskite Ln1/3MO3 (Ln = Pr, Nd, M = Nb, Ta)

AU - Noked, O.

AU - Melchior, A.

AU - Shuker, R.

AU - Steininger, R.

AU - Kennedy, B. J.

AU - Sterer, E.

N1 - Funding Information: The authors acknowledge ANKA for granting beamtime at SUL-X. The research at ANKA received funding from the European Community’s Seventh Framework Programme under Grant Agreement No 226716 (ELISA) for proposal CM 68. This work was partially supported by the Australian Research Council.

PY - 2014/1/1

Y1 - 2014/1/1

N2 - High-pressure X-ray diffraction measurements have demonstrated that the cation-deficient perovskites Pr1/3NbO3, Pr1/3TaO3, Nd1/3NbO3, and Nd1/3TaO3 undergo irreversible pressure-induced amorphization (PIA). This occurs near 14.5 GPa for the niobates and 18.5 GPa for the tantalates. The unit cell volumes of the four oxides show an almost linear decrease as the pressure is increased. It is concluded that the PIA transition occurs at higher pressures in the tantalates due to the lower MO6 initial tilting at ambient conditions, which is associated with the larger atomic mass of the tantalum. The behavior of these oxides is compared to that of CaTiO3, and the role of both the weakening of the M-O-M π-bonding and the cation vacancies on the observed structural changes is discussed.

AB - High-pressure X-ray diffraction measurements have demonstrated that the cation-deficient perovskites Pr1/3NbO3, Pr1/3TaO3, Nd1/3NbO3, and Nd1/3TaO3 undergo irreversible pressure-induced amorphization (PIA). This occurs near 14.5 GPa for the niobates and 18.5 GPa for the tantalates. The unit cell volumes of the four oxides show an almost linear decrease as the pressure is increased. It is concluded that the PIA transition occurs at higher pressures in the tantalates due to the lower MO6 initial tilting at ambient conditions, which is associated with the larger atomic mass of the tantalum. The behavior of these oxides is compared to that of CaTiO3, and the role of both the weakening of the M-O-M π-bonding and the cation vacancies on the observed structural changes is discussed.

KW - High pressure

KW - Perovskite

KW - Pressure-induced amorphization

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