Comparative study of the phase transitions and spectral properties of NH2(CH3)2Me1-xCrx(SO4)2x6H2O (Me = Al, Ga) ferroelectrics

被引：3

作者：

Ostapenko, Natalya ^{[1
,2
]}

Kapustianyk, Volodymyr ^{[1
,2
]}

Eliyashevskyy, Yuriy ^{[1
]}

Rudyk, Victor ^{[2
]}

Czapla, Zbigniew ^{[3
,4
]}

Mokryi, Volodymyr ^{[5
]}

机构：

[1] Ivan Franko Natl Univ Lviv, Sci Tech & Educ Ctr Low Temp Studies, Dragomanova Str 50, UA-79005 Lvov, Ukraine

[2] Ivan Franko Natl Univ Lviv, Dept Phys, Dragomanova Str 50, UA-79005 Lvov, Ukraine

[3] Opole Univ Technol, Dept Phys, Ozimska 75, PL-45370 Opole, Poland

[4] Univ Wroclaw, Inst Expt Phys, Pl M Borna 9, PL-50204 Wroclaw, Poland

[5] Lviv Polytech Natl Univ, Dept Ecol Safety & Nat Protect Act, Heneral Chuprynka Str 130, UA-79057 Lvov, Ukraine

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 730卷

关键词：

Electronic band structure; Crystal and ligand fields; Phase transitions; Optical spectroscopy; RAMAN-SPECTRA; CRYSTALS; DISPERSION; CHROMIUM;

D O I：

10.1016/j.jallcom.2017.09.319

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：

This article is devoted to study of Cr3+ ion complexes in NH2(CH3)(2)Me1-xCrx(SO4)(2) x 6H(2)O, Me = Al, Ga (DMAMe(1-x)Cr(x)S) crystals. On the basis of spectroscopic data the energy diagram and the parameters of the crystal field corresponding to the above mentioned complexes were specified. It was shown that isomorphous substitution of the metal ion practically does not affect the temperature of ferroelectric-ferroelastic phase transition in NH2(CH3)(2)Ga1-xCrx(SO4)(2) x 6H(2)O contrary to the case of NH2(CH3)(2)Al1-xCrx(SO4)(2) x 6H(2)O crystal. The structure and temperature changes of the absorption spectra of the above mentioned solid solutions are explained in terms of the internal electronic transitions in [Cr(H2O)(6)](3+) octahedral complexes. The symmetry and distortion of the complexes within the structure of all investigated crystals were analyzed on the basis of the Raman spectroscopy data. (C) 2017 Published by Elsevier B.V.

引用

页码：417 / 423

页数：7

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