کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1592578 | 1515640 | 2013 | 4 صفحه PDF | دانلود رایگان |

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.
Journal: Solid State Communications - Volume 155, February 2013, Pages 45–48