AI Article Synopsis
- Researchers studied cobalt phosphides under high pressure and temperature to understand their structural properties in Earth and planetary interiors.
- They discovered a new cobalt phosphide, CoP, synthesized at high pressures and temperatures, which has a unique structure involving CoP square pyramids and tetrahedra.
- Upon returning to normal conditions, the material exhibited instability, as indicated by peak broadening and loss of reflections in X-ray diffraction data.
Article Abstract
The structural properties of cobalt phosphides were investigated at high pressures and temperatures to better understand the behavior of metal-rich phosphides in Earth and planetary inter-iors. Using single-crystal X-ray diffraction synchrotron data and a laser-heated diamond anvil cell, we discovered a new high pressure-temperature () cobalt phosphide, CoP, dodeca-cobalt hepta-phosphide, synthesized at 27 GPa and 1740 K, and at 48 GPa and 1790 K. CoP adopts a structure initially proposed for CrP (space-group type , =1), consisting of chains of edge-sharing CoP square pyramids and chains of corner-sharing CoP tetra-hedra. This arrangement leaves space for trigonal-prismatic channels running parallel to the axis. Coupled disordering of metal and phospho-rus atoms has been observed in this structure for related P ( = Cr, V) compounds, but all Co and P sites are ordered in CoP. All atomic sites in this crystal structure are situated on special positions. Upon decompression to ambient conditions, peak broadening and loss of reflections at high angles was observed, suggesting phase instability.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7534243 | PMC |
| http://dx.doi.org/10.1107/S2056989020012657 | DOI Listing |
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