Author(s)

Hamit Yurtseven, Sukran Aslan

Department of Physics, Middle East Technical University, Ankara, Turkey.

We analyze the temperature dependence of the Raman intensity using the experimental data according to a power-law formula close to the order-disorder transition (Tc = 549 K) in NaNO ₃. From this analysis, we extract the value of β = 0.26 as the critical exponent for the order parameter, which indicates a tricritical phase transition in this crystalline system. Using the temperature dependence of the order parameter, the Raman bandwidth is calculated at various temperatures in NaNO₃. Our calculated bandwidths describe adequately the observed behaviour of the order-disorder transition in this crystal.

Raman Intensity; Bandwidth; NaNO3

H. Yurtseven and S. Aslan, "Temperature Dependence of the Raman Intensity and the Bandwidth Close to the Order-Disorder Phase Transition in NaNO₃," Optics and Photonics Journal, Vol. 2 No. 3A, 2012, pp. 249-253. doi: 10.4236/opj.2012.223038.