Thermal expansion of α-boron and some boron-rich pnictides. (December 2019)

• Record Type: Journal Article
• Authors: Cherednichenko, Kirill A.; Solozhenko, Vladimir L.
• Is Part Of: Solid state communications. Volume 303/304(2019)
• Publication Date: 2019-12
• Subjects: A. Boron -- A. Boron pnictides -- C. X-ray diffraction -- D. Thermal expansion; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2019.113735
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: Thermal expansion of α-rhombohedral boron (α-B12 ) and two isostructural boron-rich pnictides (B12 P2 and B12 As2 ) 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 (B13 N2 – B12 P2 – B12 As2 ) was analyzed. Highlights: 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.