Cover Page September-2011-Advanced Materials Letters

Advanced Materials Letters

Volume 2, Issue 3, Pages 239-244, September 2011
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Structural And Dielectric Properties Of Y2(Ba0.5R0.5)2O7 (R = W, Mo) Ceramics

N.K. Singh*, Pritam Kumar

University Department of Physics, V. K. S. University, Ara 802301, India 

Adv. Mater. Lett., 2011, 2 (3), pp 239-244

DOI: 10.5185/amlett.2011.1215

Publication Date (Web): Apr 08, 2012

E-mail: singh_nk_phy27@yahoo.com

Abstract

Defect pyrochlore-type Y2(Ba0.5R0.5)2O7 (R = W, Mo) oxides ceramics were prepared by using high-temperature solid-state reaction technique. Preliminary studies of X-ray diffraction (XRD) patterns and scanning electron micrographs (SEM) of the compounds at room temperature suggested that compounds have single phase orthorhombic structures and uniform grain distribution throughout the surface of the samples. Detailed studies of dielectric and electrical properties of the materials in a wide range of frequency (1 kHz–1MHz) and temperatures (23–344°C) showed that these properties are strongly temperature and frequency dependent. Variation of dielectric constant (ε') and tangent loss (tanδ) as a function temperatures showed the abnormal behavior around 132°C at 10 kHz and 141°C at 30 kHz of Y2(Ba0.5W0.5)2O7 and around 293°C at 10 kHz and 305°C at 30 kHz of Y2(Ba0.5Mo0.5)2O7 ceramics respectively.

Keywords

Pyrochlore, dielectrics, electrical properties, X-ray diffraction, scanning electron micrographs

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