Betaine potassium iodide dihydrate: a new compound of betaine

• Tipo: Outra Publicação em Revista Científica Internacional
• Data: 1998

Autores

Almeida, A (Autor) FCUP; Chaves, MR (Autor) FCUP; Moreira, JA (Autor) Outra; Pinto, F (Autor) Outra; Klopperpieper, A (Autor) Outra

Revista

Título: Journal of Physics Condensed Matter

Vol. 10

Páginas: L773-L777

ISSN: 0953-8984

Editora: Institute of Physics Publishing

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 12 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5