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2019•Physics of the Solid StateOpen access

Raman Spectra of Polycrystalline Lithium Sulfate, Sodium Sulfate, and Potassium Sulfate in the Pretransition Temperature Range Lower the Structural Phase Transition

A. �. Aliev, I. R. Akhmedov, M. G. Kakagasanov, Z. A. Aliev

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Abstract

Abstract Molecular relaxation processes in lithium sulfate (Li2SO4), sodium sulfate (Na2SO4), and potassium sulfate (K2SO4) 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 Li2SO4, Na2SO4, and K2SO4 is proven.

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Abstract Molecular relaxation processes in lithium sulfate (Li2SO4), sodium sulfate (Na2SO4), and potassium sulfate (K2SO4) 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 Li2SO4, Na2SO4, and K2SO4 is proven.

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Available abstract

Abstract Molecular relaxation processes in lithium sulfate (Li2SO4), sodium sulfate (Na2SO4), and potassium sulfate (K2SO4) 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 Li2SO4, Na2SO4, and K2SO4 is proven.

Key concepts: Lithium sulfate, Sulfate, Raman spectroscopy, Potassium sulfate, Sodium sulfate, Materials science, Lithium (medication), Phase transition

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