Abstract 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.

中文翻译：

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α-硼和一些富硼 pnictides 的热膨胀

摘要 通过高温同步加速器 X 射线衍射研究了 α-菱形硼 (α-B12) 和两种同构的富硼 pnictides (B12P2 和 B12As2) 在 298 和 1280 K 之间的热膨胀。对于所有研究的相，没有观察到温度引起的相变。发现观察到的晶格参数和晶胞体积的温度依赖性是准线性的。分析了富硼 pnictides (B13N2 – B12P2 – B12As2) 组中热膨胀系数的变化。