Electrical and Dielectric Spectroscopic Characterization of Polycrystalline Dy₂Si₂O₇

Abstract:

The compound Dy₂Si₂O₇ exists in two polymorphs, the low temperature triclinic phase (type B) and a high temperature orthorhombic phase (type E).The dc and ac electrical conductivities of E-Dy₂Si₂O₇ are measured in the temperature range 290-510 K and frequency range 1 kHz to 1 MHz . The dc electrical transport data are analyzed according to Motts variable-range hopping model. The disorder parameter (T_o) and density of states at fermi level are obtained. The ac conductivity σ_ac (ω) is obtained through the dielectric parameters. The ac conductivity can be expressed as σ_ac (ω) =B ω ^s , where s is slope and it decreases with increase in temperature. The conduction mechanism in the compound is discussed in low and high temperature regions in the light of theoretical models.

• Periodical: Key Engineering Materials (Volumes 510-511)
• Pages: 194-200
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.510-511.194
• Online since: May 2012
• Authors: Shahid Ameer, Asghari Maqsood
• Keywords: Ceramic, Dielectric Response, Electrical Transport, Energy Storage Materials, Rare Earth Alloys, Rare Earth Compounds

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