Thermal expansion of the disordered form of 2-fluoronaphthalene (form I)

The thermal-expansion tensor of the disordered form of 2-fluoronaphthalene (C₁₀H ₇F) was calculated from the changes of the lattice constants with temperature (273-323 K) as measured with X-ray and neutron diffraction. The results show that the thermal-expansion anisotropy is significant. The structural interpretation of this property is not trivial.