The product form for Debye relaxations

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Ribeiro, JL (Author) Other; Vieira, LG (Author) Other; Chaves, MR (Author) Other; Almeida, A (Author) FCUP; Sarmento, S (Author) Other; Klopperpieper, A (Author) Other

Journal

Title: Journal of Physics Condensed Matter

Vol. 16

Pages: 2733-2743

ISSN: 0953-8984

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-000-AS5

DOI: 10.1088/0953-8984/16/15/023

Abstract (EN): From a phenomenological point of view, the dielectric dispersion function of a medium can be defined by the location of its zeros and poles in the complex frequency plane. This general approach led to the use of a factorized form of the dielectric function to fit the experimental infrared reststrahlen data. Recently, such an approach has been generalized to the description of relaxation. At low frequency ranges, the factorized form for relaxation may be expressed as a product of Debye relaxors. This product form corresponds to the factorization of the conventional sum model and provides a way to describe the contribution of the different Debye relaxing units in a poly-dispersive system. It also allows us to estimate the importance of the interaction between the different relaxing units. The present work summarizes the fundamentals of the product model for relaxation and describes its application to the analysis of the dispersion observed in the vicinity of the paraelectric to antiferroelectric phase transition in the mixed crystal (betaine phosphate)(0.75) (betainearsenate)(0.25) and at the structural phase transition of betaine potassium iodide dihydrate.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11