Dielectric Properties and Structural Features of Barium-iron Phosphate Glasses

Abstract

The dielectric constant of barium-iron phosphate glasses with the general composition (40−x)BaO · xFe2O3 · (60−x)P2O5 has been investigated at two fixed frequencies (100 kHz and 9.0 GHz). The dielectric constant measured using microwave technique, and the ratio O/P of these glasses increase with increasing Fe2O3 content. The structure and valence states of the iron ions in these glasses were investigated using Mössbauer spectroscopy, infrared spectroscopy and differential thermal analysis. Both Fe(II) and Fe(III) ions present in these glasses in octahedral coordination act as permanent dipoles, and the increase of the iron concentration increase these permanent dipoles, contributing to the dielectric constant.

Department(s)

Materials Science and Engineering

Sponsor(s)

Fundação de Amparo à Pesquisa do Estado de São Paulo
University of Sao Paulo. Institute of Physics

Keywords and Phrases

Barium-Iron; Phosphate Glasses; Mossbauer spectroscopy

International Standard Serial Number (ISSN)

0022-3093; 1873-4812

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2004 Elsevier, All rights reserved.

Publication Date

01 May 2004

Link to Full Text

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