Impedance spectroscopy study of SiO2-Li2O:Nd2O3 glasses

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2014.01.151· OSTI ID:1121803

Pereia, R. ^[1]; Gozzo, C B ^[1]; Guedes, I. ^[2]; Boatner, Lynn A ^[3]; Terezo, A J ^[1]; Costa, M M ^[1]

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1. LACANM – Laboratório de Caracterização em Novos Materiais - Brazil
2. Universidade Federal do Ceara, Ceara, Brazil
3. ORNL

In the present study, neodymium-doped lithium silicate glasses have been prepared by the conventional melt-quenching technique. The dielectric properties, electric modulus and electrical conductivity of SiO2-Li2O (SiLi-0Nd) and SiO2-Li2O:Nd2O3 (SiLi-1.35Nd) have been studied from 1 Hz to 1 MHz in the 333 423 K temperature range. At a given temperature and frequency, we observe that the resistivity increases while the conductivity accordingly decreases when neodymium ions are added to the glass matrix. The activation energy of two distinct regions was evaluated from the ln( dc)=f(1/T) plot and was found to be E1(T<363K)=0.61(0.66)eV and E2(T>363K)=1.26(1.09)eV for SiLi-0Nd (SiLi-1,35Nd). The dielectric constant ( Re) decreases while the dielectric loss (tan ( )) increases under Nd2O3 doping. We also observe that for both glasses, Re and tan ( ) tend to increase with increasing temperature and decrease with increasing frequency.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1121803
• Journal Information: Journal of Alloys and Compounds, Vol. 597; ISSN 0925-8388
• Country of Publication: United States
• Language: English

Related Subjects

Glasses
electrical characterization
dielectric properties
electrical conductivity