Thermal expansion of α-boron and some boron-rich pnictides

• Published in: Solid state communications Vol. 303-304; p. 113735
• Main Authors: Cherednichenko, Kirill A., Solozhenko, Vladimir L.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2019; Elsevier
• Subjects: A. Boron; A. Boron pnictides; C. X-ray diffraction; Condensed Matter; D. Thermal expansion; Physics; A. Boron pnictides; A. Boron; C. X-ray diffraction; D. Thermal expansion; X-ray diffraction; Thermal expansion; Boron; Boron pnictides
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/j.ssc.2019.113735

Thermal expansion of α-rhombohedral boron (α-B12) and two isostructural boron-rich pnictides (B12P2 and B12As2) has been studied between 298 and 1280 K by high-temperature synchrotron X-ray diffraction. For all studied phases no temperature-induced phase transitions have been observed. The observed temperature dependencies of the lattice parameters and unit cell volumes were found to be quasi-linear. Variation of the thermal expansion coefficients in the group of boron-rich pnictides (B13N2 – B12P2 – B12As2) was analyzed.
•High-temperature behavior of α-B12 and boron-rich pnictides (B12P2, B12As2) was studied.•No temperature-induced phase transitions or decomposition were observed up to 1280 K.•Thermal expansion coefficients are 17.9 × 10^-6/K for B12P2 and 15.3 × 10^-6/K for B12As2.