Article ID Journal Published Year Pages File Type
1592578 Solid State Communications 2013 4 Pages PDF
Abstract

Particle swarm optimization technique was applied to a structural search, yielding a high-pressure phase of BaCrO4, i.e. orthorhombic P212121 phase (stable>16 GPa). The P212121 structure consists of [CrO4] tetrahedra and ionized Ba, and can be viewed as a strong distortion of the low-pressure Pnma structure. Analysis of X-ray diffraction spectrum suggested that P212121 structure might be the experimentally observed high-pressure phase at pressures above 9 GPa, which was previously identified as monoclinic P21/m structure. Moreover, the calculated electronic structure suggests that P212121 structure is a semi-conductor with a band gap of 2.63 eV.

► We predicted a pressure-induced Pnma→P212121 phase transition for BaCrO4. ► The P212121 structure is possibly the recently observed new phase. ► The P212121 structure is a strong distortion of the low-pressure Pnma structure. ► The P212121 structure is a semiconductor with a band gap of 2.63 eV.

Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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