Thermal expansion of pyrazine

The thermal expansion tensor of pyrazine(1,4-diazabenzene, C₄H₄N₂) has been calculated from the changes of the lattice constants with temperature, as measured with X-ray diffraction. The elements of the thermal expansion tensor at 293 K are α_a = −14 (3), α_b = 111 (5) and α_c = 246 (3) x 10⁻⁶°K⁻¹