Phase transitions and transport properties in tetra-n-butylammonium iodide

Phase transitions and transport properties in tetra-n-butylammonium iodide Full article

Journal

Solid State Ionics
ISSN: 0167-2738

Output data

Year: 2019, Volume: 336, Pages: 26-30 Pages count : 5 DOI: 10.1016/j.ssi.2019.02.024

Authors

Iskakova A.A. ¹ , Asanbaeva N.B. ¹ , Gerasimov K.B. ¹ , Uvarov N.F. ^1,2,3 , Slobodyuk A.B. ⁴ , Kavun V.Ya. ⁴

Affiliations

1	Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences
2	Федеральное государственное автономное образовательное учреждение высшего образования «Новосибирский национальный исследовательский государственный университет»
3	Федеральное государственное бюджетное образовательное учреждение высшего образования «Новосибирский государственный технический университет»
4	Institute of Chemistry of the Far-Eastern Division of the Russian Academy of Sciences

A remarkable feature of organic salts is easy reorientation of organic groups, especially in high-temperature phases. It would be expected that the reorientational motion of organic groups promotes also ion transport processes within the crystal structure. In this work thermal and transport properties of solid organic salt (nC4H9)4NI were investigated by methods of DSC, dilatometry, conductivity measurements and NMR spectroscopy. It was proposed that three low-temperature phases, II, III and IV, along to the high-temperature phase I appear in this salt after heat treatment. The conductivity and temperature stability range of the low-temperature phases depend on conditions of the heat treatment of the salt. Temperature intervals of stability of phases II and III considerably increases after prolonged heating in the melt. In parallel, the conductivity of all low-temperature phases increases in contrast to the conductivity of the phase I. These facts may be explained by the formation of extrinsic iodine vacancies as a result of the dissolution of tributylanine formed at partial thermal decomposition of the salt. According to 1 H NMR data, in high-temperature phase TBA cations are mobile. No information on anionic diffusion in this phase was obtained due to a low intensity of 127I NMR spectra. The most mobile defects in low-temperature phases of (n-C4H9)4NI seem to be iodine vacancies.

Iskakova A.A. , Asanbaeva N.B. , Gerasimov K.B. , Uvarov N.F. , Slobodyuk A.B. , Kavun V.Y.
Phase transitions and transport properties in tetra-n-butylammonium iodide
Solid State Ionics. 2019. V.336. P.26-30. DOI: 10.1016/j.ssi.2019.02.024 WOS Scopus РИНЦ OpenAlex

Submitted:	Sep 30, 2018
Published online:	Feb 26, 2019

Web of science:	WOS:000470951300004
Scopus:	2-s2.0-85063077165
Elibrary:	38671149
OpenAlex:	W2922882737

DB	Citing
OpenAlex	8
Web of science	6
Scopus	6