Dielectric Properties and Structural Features of Barium-iron Phosphate Glasses
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.
P. Bergo et al., "Dielectric Properties and Structural Features of Barium-iron Phosphate Glasses," Journal of Non-Crystalline Solids, Elsevier, May 2004.
The definitive version is available at http://dx.doi.org/10.1016/j.jnoncrysol.2004.02.008
Materials Science and Engineering
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
Article - Journal
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