Betaine potassium iodide dihydrate: a new compound of betaine

• Type: Another Publication in an International Scientific Journal
• Date: 1998

Authors

Almeida, A (Author) FCUP; Chaves, MR (Author) FCUP; Moreira, JA (Author) Other; Pinto, F (Author) Other; Klopperpieper, A (Author) Other

Journal

Title: Journal of Physics Condensed Matter

Vol. 10

Pages: L773-L777

ISSN: 0953-8984

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 12 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-001-6HN

DOI: 10.1088/0953-8984/10/50/001

Abstract (EN): Betaine potassium iodide dihydrate, [(CH3)(3)N+CH2COO-](2).KI.2H(2)O, BKI for short, is a new compound of the aminoacid betaine with a triclinic symmetry and the space group PT at room temperature. The study of dielectric properties provided evidence for the existence of a structural phase transition occurring around 100 K. The spontaneous electric polarization is zero in both phases. A study of dielectric dispersion disclosed two relaxational modes with different relevance in the high and in the low temperature phases. The main features observed in BKI are consistently described by the Landau theory, by assuming a quadratic coupling between the primary order parameter and the electric polarization.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5