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High-Temperature Molecular Ferroelectric Tris(2-hydroxyethyl) Ammonium Bromide with Dielectric Relaxation.
- Source :
-
The journal of physical chemistry letters [J Phys Chem Lett] 2019 Nov 07; Vol. 10 (21), pp. 6650-6655. Date of Electronic Publication: 2019 Oct 16. - Publication Year :
- 2019
-
Abstract
- We obtained one new molecular ferroelectric material tris(2-hydroxyethyl) ammonium bromide ( TAB ) that crystallizes in aqueous solution at room temperature with a space group of R 3 m which belongs to ten polar space groups. There is a paraelectric-to-ferroelectric phase transition at 424 K (from hexagonal R 3̅ m to hexagonal R 3 m phase). Such a high transition temperature is close to that of diisopropylamine bromide (426 K) and higher than that of many other molecular ferroelectrics, such as triethylmethylammonium tetrabromoferrate(III) (360 K); some of the organic-inorganic perovskite ferroelectrics, such as (cyclohexylammonium) <subscript>2</subscript> PbBr <subscript>4</subscript> (363 K); and some inorganic ferroelectrics, including BaTiO <subscript>3</subscript> (393 K). The saturated polarization and the coercive field of TAB measured from the ferroelectric hysteresis loop are about 0.54 μC·cm <superscript>-2</superscript> and 0.62 kV/cm, respectively. Given its superior performance, including high phase transition temperature, room-temperature ferroelectricity, small coercive electric field, and adjustable ladder-shaped dielectric constant, TAB will have many potential applications.
Details
- Language :
- English
- ISSN :
- 1948-7185
- Volume :
- 10
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- The journal of physical chemistry letters
- Publication Type :
- Academic Journal
- Accession number :
- 31602977
- Full Text :
- https://doi.org/10.1021/acs.jpclett.9b02875