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Resonant frequency shifts related to the elastic constants near the alpha-beta transition in quartz
Date
2019-03-05
Author
Yurtseven, Hasan Hamit
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The resonant frequency shifts of vibrational modes are related to the elastic constants at various temperatures for the alpha-beta transition in quartz (T-c = 573.0 degrees C for alpha-quartz and 574.3 degrees C for beta-quartz). This correlation is constructed on the basis of the spectroscopic modifications of the Pippard relations near the alpha-beta transition in quartz by using the observed data from the literature.
Subject Keywords
Inorganic Chemistry
,
Organic Chemistry
,
Analytical Chemistry
,
Spectroscopy
URI
https://hdl.handle.net/11511/43558
Journal
JOURNAL OF MOLECULAR STRUCTURE
DOI
https://doi.org/10.1016/j.molstruc.2018.11.044
Collections
Department of Physics, Article
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We calculate here the specific heat of NH4Br using our Raman frequency shifts for the lattice mode Of nu(7) TA (56 cm(-1)) and the internal mode Of nu(2) (1684 cm(-1)) near its lambda-phase transition (T-lambda = 234 K, P = 0). By analyzing our Raman frequency shifts, values of alpha = 0. 19 (T < T-lambda, and T > T-lambda) for the lattice mode, and alpha = 0.45 (T < T-lambda) and alpha = 0.57 (T > T-lambda) for the internal mode, are used as the values of the critical exponent for the specific heat to pred...
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H. H. Yurtseven, “Resonant frequency shifts related to the elastic constants near the alpha-beta transition in quartz,”
JOURNAL OF MOLECULAR STRUCTURE
, pp. 421–424, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/43558.