The novel high-pressure/high-temperature compound Co12P7 determined from synchrotron data
| Autor: | Stella Chariton, Claire Zurkowski, Andrew J. Campbell, Barbara Lavina, Sergey N. Tkachev, Vitali B. Prakapenka |
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| Rok vydání: | 2020 |
| Předmět: |
Diffraction
crystal structure chemistry.chemical_element 02 engineering and technology Crystal structure Type (model theory) 010402 general chemistry 01 natural sciences Diamond anvil cell Research Communications law.invention Metal law synchrotron General Materials Science Crystallography high-pressure synthesis General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Synchrotron 0104 chemical sciences M12P7 phase chemistry QD901-999 cobalt phosphide visual_art visual_art.visual_art_medium 0210 nano-technology Cobalt Earth (classical element) |
| Zdroj: | Acta Crystallographica Section E: Crystallographic Communications Acta Crystallographica Section E: Crystallographic Communications, Vol 76, Iss 10, Pp 1665-1668 (2020) |
| ISSN: | 2056-9890 |
| DOI: | 10.1107/s2056989020012657 |
| Popis: | Co12P7, synthesized at high pressure/temperature conditions, crystallizes isotypically with ordered Cr12P7 in space-group type P . 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 interiors. Using single-crystal X-ray diffraction synchrotron data and a laser-heated diamond anvil cell, we discovered a new high pressure–temperature (HP–HT) cobalt phosphide, Co12P7, dodecacobalt heptaphosphide, synthesized at 27 GPa and 1740 K, and at 48 GPa and 1790 K. Co12P7 adopts a structure initially proposed for Cr12P7 (space-group type P , Z =1), consisting of chains of edge-sharing CoP5 square pyramids and chains of corner-sharing CoP4 tetrahedra. This arrangement leaves space for trigonal–prismatic channels running parallel to the c axis. Coupled disordering of metal and phosphorus atoms has been observed in this structure for related M 12P7 (M = Cr, V) compounds, but all Co and P sites are ordered in Co12P7. 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. |
| Databáze: | OpenAIRE |
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