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Spectroscopic modifications of the pippard relations for NaNO2 in the paraelectric phase
Date
2002-02-01
Author
Yurtseven, Hasan Hamit
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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.
Subject Keywords
Incommensurate phase
,
Sodium-Nitrite
,
Dynamics
URI
https://hdl.handle.net/11511/52669
Journal
Chinese Journal of Physics
Collections
Department of Physics, Article
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We study here the Pippard relations modified spectroscopically for the NH4Cl crystal. By relating the specific heat C-P to the frequency shift (1/v)(partial derivative v/partial derivative T)(P) for the disorder-allowed Raman modes of v(7) (93 cm(-1)) and v(5) (144 cm(-1)) in NH4Cl close to the tricritical point (P = 1.6 kbar, T-C = 257 K), we show that the first Pippard relation is valid for this crystalline system.
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Spectroscopic modifications of Pippard relations: first-order and second-order phase transitions in NH4Cl
Yurtseven, Hasan Hamit (2001-01-01)
In this study we introduce the spectroscopic modifications of Pippard relations and apply them to the disorder-induced Raman modes of NH4Cl in the first-order (P = 0) and second-order (2.8 kbar) phase regions in this crystalline system. We obtain Linear variations of the specific heat C-p with out observed frequency shifts [(l/nu)(partial derivative nu/partial derivativeT)(p)] of those Raman modes studied for the first-order and second-order phase transitions in NH4Cl. This will be discussed in detail.
SPECTROSCOPIC MODIFICATIONS OF PIPPARD RELATIONS AND THEIR APPLICATION TO NH4CL
Yurtseven, Hasan Hamit (1994-07-01)
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...
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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.