The Raman intensity behavior of the nitrate modes during phase transitions is analyzed via the power law \T-T-c\(beta) for (F-, Cl-, Br-)-doped NH4NO3 and (Na+, Rb+, Cs+, Ag+)-doped KNO3 crystals. The exponent beta is shown to be highly dependent on the degree of doping. This observation is based on the resonance behavior of the resident dopant. The spatial extent of the resonance mode is shown to be the characteristic dimension for the crystal domains during phase transition. This extent is demonstrated to be proportional to d(c), the characteristic average distance between dopant ions at which beta values of the nitrate nu(1) and nu(4) modes are the same. The scaling property as evidenced by beta of the nu(1) mode is analyzed via the (mass of the dopant)(-1/2) scaled average distance between dopant ions which is an important parameter for characterizing the doping effect. Previous results for the (Na+, K+, Ag+, Pb2+)-doped NH4NO3 crystals are also employed to complete the analysis [S. Ma, G. Wu, and H. Wang, J. Chem. Phys. 108, 7758 (1998)].