TY  - JOUR
AU  - Solozhenko, Vladimir
AU  - Kurakevych, Oleksandr
TI  - Equilibrium p-T Phase Diagram of Boron: Experimental Study and Thermodynamic Analysis
JO  - Scientific reports
VL  - 3
SN  - 2045-2322
CY  - London
PB  - Nature Publishing Group
M1  - PUBDB-2015-05293
SP  - 2351
PY  - 2013
AB  - Solid-state phase transformations and melting of high-purity crystalline boron have been in situ and ex situ studied at pressures to 20 GPa in the 1500–2500 K temperature range where diffusion processes become fast and lead to formation of thermodynamically stable phases. The equilibrium phase diagram of boron has been constructed based on thermodynamic analysis of experimental and literature data. The high-temperature part of the diagram contains p-T domains of thermodynamic stability of rhombohedral β-B<sub>106</sub>, orthorhombic γ-B<sub>28</sub>, pseudo-cubic (tetragonal) t'-B<sub>52</sub>, and liquid boron (L). The positions of two triple points have been experimentally estimated, i.e. β–t'–L at   8.0 GPa and   2490 K; and β–γ–t' at   9.6 GPa and   2230 K. Finally, the proposed phase diagram explains all thermodynamic aspects of boron allotropy and significantly improves our understanding of the fifth element.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000322698700001
C6  - pmid:23912523
DO  - DOI:10.1038/srep02351
UR  - https://bib-pubdb1.desy.de/record/289178
ER  -