Колебательные спектры ионно-молекулярных кристаллов карбонатов в предпереходной области вблизи структурных фазовых переходов

Molecular relaxation processes in lithium carbonate (Li2CO3), sodium carbonate (Na2CO3) and potassium carbonate (K2CO3) were studied by Raman spectroscopy. It has been established that in crystalline carbonates Li2CO3, Na2CO3 and K2CO3, the structural phase transition of the first kind is stretched (diffuse phase transition). The existence of the pretransition region in the studied carbonates Li2CO3, Na2CO3 and K2CO3 was found.

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Предпереходные явления в области фазовых переходов первого рода в ионно-молекулярных кристаллах

Физика твердого тела ◽

10.21883/ftt.2020.06.49344.34m ◽

2020 ◽

Vol 62 (6) ◽

pp. 890

Author(s):

А.Р. Алиев ◽

И.Р. Ахмедов ◽

М.Г. Какагасанов ◽

З.А. Алиев

Keyword(s):

Phase Transition ◽

Raman Spectroscopy ◽

Phase Transitions ◽

Transition Region ◽

Diffuse Phase Transition ◽

Structural Phase ◽

Study Phase ◽

Relaxation Processes ◽

Structural Phase Transitions ◽

Diffuse Phase

Raman spectroscopy was used to study the molecular relaxation processes in sulfates Li2SO4, Na2SO4, K2SO4, carbonates Li2CO3, Na2CO3, K2CO3, perchlorates NaClO4, KClO4 and nitrates Ca(NO3)2, Sr(NO3)2, Ba(NO3)2. It has been established that in the systems under study, phase transitions of the first kind are stretched in nature (diffuse phase transition): in sulfates, carbonates and perchlorates they are structural phase transitions, and in nitrates this is a crystal-melt phase transition. The existence of a pre-transition region was found in all the crystals studied.

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Raman spectroscopy study of the behavior of the soft mode in a structural phase transition in the Pr3Sb5O12 crystal

Physics of the Solid State ◽

10.1134/s1063783415110256 ◽

2015 ◽

Vol 57 (11) ◽

pp. 2286-2289 ◽

Cited By ~ 1

Author(s):

A. S. Oreshonkov ◽

A. K. Khodzhibaev ◽

A. S. Krylov ◽

M. F. Umarov ◽

A. N. Vtyurin

Keyword(s):

Phase Transition ◽

Raman Spectroscopy ◽

Structural Phase Transition ◽

Soft Mode ◽

Structural Phase ◽

Spectroscopy Study

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High-pressure structural phase transition and metallization in Ga2S3 under non-hydrostatic and hydrostatic conditions up to 36.4 GPa

Journal of Materials Chemistry C ◽

10.1039/d0tc06004f ◽

2021 ◽

Author(s):

Linfei Yang ◽

Jianjun Jiang ◽

Lidong Dai ◽

Haiying Hu ◽

Meiling Hong ◽

...

Keyword(s):

Phase Transition ◽

Raman Spectroscopy ◽

High Pressure ◽

Structural Properties ◽

Structural Phase Transition ◽

First Principles ◽

Theoretical Calculations ◽

Structural Phase

The vibrational, electrical and structural properties of Ga2S3 were explored by Raman spectroscopy, EC measurements, HRTEM and First-principles theoretical calculations under different pressure environments up to 36.4 GPa.

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