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吴国祯

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Raman intensity study of scaling properties of Na+, K+, Ag+, and Pb2+ doped NH4NO3 crystals during phase transitions

吴国祯Shuguo Ma Guozhen Wua) and Huanru Wangb)

J. Chem. Phys., Vol. 108, No.18, 8 May 1998,-0001,():

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摘要/描述

It is observed that, for molecular crystals, during phase transitions the Raman intensities of the vibrational modes obey the power law |T-Tc|β. The exponent bcontains much critical information and is mode dependent. The scaling properties of the doped materials are imbedded in bwhich is found to be very sensitive to very small degrees of doping. One of the eminent phenomena is the so-called crossover point where bof the totally symmetric ν1 mode equals the nonsymmetric ν4 mode of the nitrate ion. The scaling is expressed through the scaled coordinate d/M1/2 where d is the averaged interdoped-cationic distance and Mis the mass of the cation. β of the ν1 mode behaves as (d/M1/2)γ with exponent γ rather independent of the transitions and the kinds of doping. Resonant modes due to doped cations are employed to explain the origin of the scaling.

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