Theoretical study of metal borides stability

Details Theoretical study of metal borides stability Theoretical study of metal borides stability

2006-07-25

arxiv.org/abs/cond-mat/0607654v1

PUBLISHED: Phys. Rev. B 74, 224507 (2006)

Physics

Condensed Matter

Superconductivity

14 pages, 15 figures

Scientific paper

10.1103/PhysRevB.74.224507

We have recently identified metal-sandwich (MS) crystal structures and shown with ab initio calculations that the MS lithium monoboride phases are favored over the known stoichiometric ones under hydrostatic pressure [Phys. Rev. B 73, 180501(R) (2006)]. According to previous studies synthesized lithium monoboride tends to be boron-deficient, however the mechanism leading to this phenomenon is not fully understood. We propose a simple model that explains the experimentally observed off-stoichiometry and show that compared to such boron-deficient phases the MS-LiB compounds still have lower formation enthalpy under high pressures. We also investigate stability of MS phases for a large class of metal borides. Our ab initio results suggest that MS noble metal borides are less unstable than the corresponding AlB$_2$-type phases but not stable enough to form under equilibrium conditions.

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