|
This article is cited in 3 scientific papers (total in 3 papers)
Phase transitions
Raman spectra of polycrystalline lithium, sodium and potassium sulfates in the pretransition temperature region below the structural phase transition
A. R. Aliev, I. R. Akhmedov, M. G. Kakagasanov, Z. A. Aliev Daghestan Institute of Physics after Amirkhanov, Makhachkala, Republic of Dagestan, Russia
Abstract:
Molecular relaxation processes in lithium sulfate (Li$_{2}$SO$_{4}$), sodium sulfate (Na$_{2}$SO$_{4}$), and potassium sulfate (K$_{2}$SO$_{4}$) are studied using Raman spectroscopy (RS). The order parameter decreases in the low-temperature phase as it approaches the phase transition. For example, this is typical of a first-order phase transition close to a second-order phase transition. The existence of the pretransition region in the investigated sulfates Li$_{2}$SO$_{4}$, Na$_{2}$SO$_{4}$, and K$_{2}$SO$_{4}$ is proven.
Keywords:
Raman scattering, ionic crystals, molecular spectroscopy, vibrational relaxation, pretransition, diffuse phase transition.
Received: 27.02.2019 Revised: 11.04.2019 Accepted: 11.04.2019
Citation:
A. R. Aliev, I. R. Akhmedov, M. G. Kakagasanov, Z. A. Aliev, “Raman spectra of polycrystalline lithium, sodium and potassium sulfates in the pretransition temperature region below the structural phase transition”, Fizika Tverdogo Tela, 61:8 (2019), 1513–1518; Phys. Solid State, 61:8 (2019), 1464–1470
Linking options:
https://www.mathnet.ru/eng/ftt8735 https://www.mathnet.ru/eng/ftt/v61/i8/p1513
|
Statistics & downloads: |
Abstract page: | 41 | Full-text PDF : | 8 |
|