تقرير
Experimental and theoretical confirmation of an orthorhombic phase transition in niobium at high pressure and temperature
| العنوان: | Experimental and theoretical confirmation of an orthorhombic phase transition in niobium at high pressure and temperature |
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| المؤلفون: | Errandonea, Daniel, Burakovsky, Leonid, Preston, Dean L., MacLeod, Simon G., Santamaria-Perez, David, Chen, Shaoping, Cynn, Hyunchae, Simak, Sergey I., McMahon, Malcolm I., Proctor, John E., Mezouar, Mohamed |
| المصدر: | COMMUNICATIONS MATERIALS (2020) 1:60 |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | Compared to other body-centered cubic (bcc) transition metals Nb has been the subject of fewer compression studies and there are still aspects of its phase diagram which are unclear. Here, we report a combined theoretical and experimental study of Nb under high pressure and temperature. We present the results of static laser-heated diamond anvil cell experiments up to 120 GPa using synchrotron-based fast x-ray diffraction combined with ab initio quantum molecular dynamics simulations. The melting curve of Nb is determined, and evidence for a solid-solid phase transformation in Nb with increasing temperature is found. The high-temperature phase of Nb is orthorhombic Pnma. The bcc-Pnma transition is clearly seen in the experimental data on the Nb principal Hugoniot. The bcc-Pnma coexistence observed in our experiments is explained. Agreement between the measured and calculated melting curves is very good except at 40-60 GPa where three experimental points lie below the theoretical melting curve by 250 K (or 7%); a possible explanation is given. Comment: 33 pages, 10 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s43246-020-00058-2 |
| URL الوصول: | http://arxiv.org/abs/2401.13818 |
| رقم الأكسشن: | edsarx.2401.13818 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/s43246-020-00058-2 |
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