NDLI: Electrical properties of some Y$_{2}$O$_{3}$ and/or Fe$_{2}$O$_{3}$-containing lithium silicate glasses and glass-ceramics

Content Provider	Springer Nature Link
Author	Gomaa, Mohamed M. Darwish, Hussein Salman, Saad M.
Copyright Year	2007
Abstract	The ac electrical properties of some lithium silicate glasses and glass-ceramics containing varying proportions of Y$_{2}$O$_{3}$ and/or Fe$_{2}$O$_{3}$ were measured to investigate their electronic hopping mechanism. There is a clear variation of these properties with composition. The obtained results were related to the concentration and role of Y$_{2}$O$_{3}$ and/or Fe$_{2}$O$_{3}$ in the lithium silicate glass structure. In crystalline solids the electrical properties data obtained were correlated to the type and content of the mineral phases formed as indicated by X-ray diffraction analysis (XRD).The conductivity, dielectric constant and dielectric loss of the studied glasses were studied using the frequency response in the interval 30 Hz–100 KHz and the effect of compositional changes on the measured properties was investigated. The measurements revealed that the electrical responses of the samples were different and complex. The addition of Y$_{2}$O$_{3}$ generally, decreased the ac conductivity, dielectric constant and dielectric losses of the lithium silicate glasses. The addition of Fe$_{2}$O$_{3}$ in Y$_{2}$O$_{3}$-containing glasses increases the conductivity, while, the dielectric constant and dielectric losses were found to be decreased. However, the addition of Fe$_{2}$O$_{3 }$instead of Y$_{2}$O$_{3}$ led to decrease the ac conductivity and increased their dielectric constant and dielectric losses.The obtained data were argued to the internal structure of the lithium silicate glass and the nature or role-played by weakness or rigidity of the structure of the sample.Lithium disilicate-Li$_{2}$Si$_{2}$O$_{5}$, lithium metasilicate-Li$_{2}$SiO$_{3}$, two forms of yttrium silicate Y$_{2}$Si$_{2}$O$_{7}$ & Y$_{2}$SiO$_{5}$, iron yttrium oxide-YFeO$_{3}$, lithium iron silicate-LiFeSi$_{2}$O$_{6}$ and α-quartz phases were mostly developed in the crystallized glasses.The conductivity of the crystalline materials was found to be relatively lower than those of the glass. At low frequency, as the Y$_{2}$O$_{3}$ content increased the ac conductivity, dielectric constant and dielectric loss data of the glass-ceramics decreased. However, the addition of Fe$_{2}$O$_{3}$ to the Y$_{2}$O$_{3}$ containing glass-ceramic led to increase the conductivity. The addition of high content of Fe$_{2}$O$_{3}$ instead of Y$_{2}$O$_{3}$ in the glass ceramic led to increase the ac conductivity.
Starting Page	5
Ending Page	15
Page Count	11
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	19
Issue Number	1
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2007-05-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Characterization and Evaluation of Materials Optical and Electronic Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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