Processes of Molecular Relaxation in Binary Crystalline Systems KNO3-KClO4, KNO3-KNO2, and K2CO3-K2SO4

被引：6

作者：

Aliev, A. R. ^{[1
]}

Akhmedov, I. R. ^{[1
,2
]}

Kakagasanov, M. G. ^{[1
,2
]}

Aliev, Z. A. ^{[1
]}

Gafurov, M. M. ^{[1
,2
]}

Rabadanov, K. Sh ^{[2
]}

Amirov, A. M. ^{[2
]}

机构：

[1] Russian Acad Sci, Amirkhanov Inst Phys, Dagestan Sci Ctr, Makhachkala 367003, Russia

[2] Russian Acad Sci, Analyt Resource Ctr, Dagestan Sci Ctr, Makhachkala 367025, Russia

来源：

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2018年 / 92卷 / 03期

基金：

俄罗斯基础研究基金会;

关键词：

molecular relaxation; binary systems; ionic crystals; Raman spectra; vibrational spectra; VIBRATIONAL-SPECTRA; SALT SYSTEMS; LIQUIDS; PERCHLORATE; NITRATES; EXCHANGE; LITHIUM; STATES;

D O I：

10.1134/S0036024418030020

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The processes of molecular relaxation in binary crystalline systems KNO3-KClO4, KNO3-KNO2, and K2CO3-K2SO4 are studied via differential thermal analysis and Raman spectroscopy. It is found that the relaxation time of the vibrations nu(1)(A) of anions NO- (3) and CO2- (3) in systems KNO3-KClO4, KNO3-KNO2, and K2CO3-K2SO4 is less than that in KNO3 and K2CO3, respectively. It is shown that the increased rate of relaxation is explained by an additional relaxation mechanism presented in the system. This mechanism is associated with the excitation of vibrations of anions ClO- (4), NO- (2), and SO2- (4) and the lattice phonons that emerge. It is found that this relaxation mechanism requires correspondence of the frequency difference of these vibrations to the region of sufficiently high density of states of the phonon spectrum.

引用

页码：470 / 474

页数：5

共 29 条

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