Volume 255, Issue 6 1700666
Original Paper

Stability and Pressure Dependent Properties of Ternary Lithium Borides of Gold and Silver

Sezgin Aydin

Sezgin Aydin

Faculty of Sciences, Department of Physics, Gazi University, 06500 Teknikokullar, Ankara, Turkey

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Mehmet Şimşek

Corresponding Author

Mehmet Şimşek

Faculty of Sciences, Department of Physics, Gazi University, 06500 Teknikokullar, Ankara, Turkey

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First published: 14 April 2018

Abstract

The structural, electronic, and mechanical properties, and dynamic stabilities of LiAu3B and LiAg3B ternary borides, and those of related LixAu9B3 (x = 0, 1, 2) sub-structures have been investigated by density functional first-principles calculations. By using ultrasoft and norm-conserving pseudopotentials, it is presented that LiAu3B is thermodynamically, mechanically, and dynamically stable at the ambient conditions, while LiAg3B is mechanically stable only. Pressure-dependent properties of LiAu3B are also studied, and it is shown that the mechanical stability is maintained in the whole pressure range (0–50 GPa), but the dynamic stability diminishes at about 20 GPa. Due to the extraordinary deviation of the lattice parameters (a and c) in the range of 25–30 GPa and the dynamic instability, a pressure-induced phase transition may be expected. By comparing the structural, electronic and mechanical properties of LixAu9B3 (x = 0, 1, 2, and 3) structures, the effects of the Li-concentration on the physical properties of the structure are discussed.

Conflict of Interest

The authors declare no conflict of interest.

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