Spectroscopic modifications of the pippard relations for NaNO2 in the paraelectric phase

2002-02-01
We examine here our spectroscopic modification of the first Pippard relation for the paraelectric phase of NaNO2. By establishing a linear variation of the specific heat C-P with the frequency shifts 1/nu 2nu/deltaT for the q[010], q[001] and q[100] modes of NaNO2, we are able to calculate dT/dP values for the paraelectric phase in this crystalline system. Our calculated dT/dP values agree with those given in the literature.
Chinese Journal of Physics

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The Pippard relations have been reformulated in terms of the spectroscopic parameters and applied to the NH4Cl system in the vicinity of its lambda-transition. We have effectively tested some of these relations in an earlier study where we have used, for the frequency shift, data for the nu5 lattice mode of NH4Cl. Here, using our observed frequency shifts for the internal mode, nu2 of NH4+, we have obtained a good fit to the Pippard relations for temperatures below T(lambda) for the NH4Cl system. We have th...
Citation Formats
H. H. Yurtseven, “Spectroscopic modifications of the pippard relations for NaNO2 in the paraelectric phase,” Chinese Journal of Physics, pp. 96–104, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52669.