Temperature Dependence of the Raman Intensity and the Bandwidth Close to the Order-Disorder Phase Transition in NaNO3

Hamit Yurtseven, Sukran Aslan
2012 Optics and Photonics Journal  
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 (T c = 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 NaNO 3 . Our
more » ... ulated bandwidths describe adequately the observed behavior of the order-disorder transition in this crystal.
doi:10.4236/opj.2012.223038 fatcat:afxe52gw6jeb7plzq5koapu3pu