Raman spectroscopy and dielectric measurements of betaine rubidium iodide dihydrate

• Type: Article in International Scientific Journal
• Date: 2002

Authors

Almeida, A (Author) FCUP; Chaves, MR (Author) FCUP; Teles, P (Author) FCUP; Pinto, F (Author) Other; Klopperpieper, A (Author) Other; amaral, j. s. (Author) Other

Journal

Title: Journal of Physics Condensed Matter

Vol. 14

Pages: 4553-4565

ISSN: 0953-8984

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 3 Citations

Other information

Authenticus ID: P-000-PCF

DOI: 10.1088/0953-8984/14/17/326

Abstract (EN): Dielectric measurements and Raman spectroscopy have shown for betaine rubidium iodide dihydrate, with formula [(CH3)(3)N+CH2COO-](2)RbI.2H(2)O, BRbI for short, the existence of two phase transitions in this compound, PT, (at T-c1 = 190 K) and PT2 (at T-c2 = 90 K). The former phase transition is related to the loss of translational and librational degrees of freedom of water molecules and this, as shown by dielectric data, triggers a relaxation process leading to a complete 'freezing in' of protons within the unit cell, and therefore, producing a proton-glass state.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13