Structural, electrical and dielectric properties of Bi<sub>1.5</sub>Zn<sub>0.92</sub>Nb<sub>1.5-<i>x</i></sub>Ta<i><sub>x</sub></i>O<sub>6.92</sub> pyrochlore ceramics

No Thumbnail Available

Date

2012

Authors

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier Sci Ltd

Research Projects

Organizational Units

Thumbnail Image
Organizational Unit
Department of Electrical & Electronics Engineering
Department of Electrical and Electronics Engineering (EE) offers solid graduate education and research program. Our Department is known for its student-centered and practice-oriented education. We are devoted to provide an exceptional educational experience to our students and prepare them for the highest personal and professional accomplishments. The advanced teaching and research laboratories are designed to educate the future workforce and meet the challenges of current technologies. The faculty's research activities are high voltage, electrical machinery, power systems, signal and image processing and photonics. Our students have exciting opportunities to participate in our department's research projects as well as in various activities sponsored by TUBİTAK, and other professional societies. European Remote Radio Laboratory project, which provides internet-access to our laboratories, has been accomplished under the leadership of our department with contributions from several European institutions.

Journal Issue

Abstract

The micro-structural, compositional, temperature dependent dielectric and electrical properties of the Bi1.5Zn0.92Nb1.5-xTaxO6.92 solid solution has been investigated. The increasing Ta content from 0.2 to 1.5 caused; single phase formation, a pronounced grain size reduction from similar to 7.0 to 2.5 mu m, sharp decrease in the dielectric constant from 198 to 88 and an increase in the electrical conductivity from 3.16 x 10(-10) to 5.0 x 10(-9) (Omega cm)(-1), respectively. The temperature dependent dielectric constant which is found to be frequency invariant in the frequency range of (0.0-2.0 MHz) exhibited a sharp change in the temperature coefficient of dielectric constant at a (doping independent) critical temperature of 395 K. The analysis of the measured data reflects a promising future for this type of pyrochlore to be used in high voltage passive device applications. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Description

Qasrawi, Atef Fayez/0000-0001-8193-6975

Keywords

Mixing, Composites, X-ray methods, Electrical properties, Dielectric

Turkish CoHE Thesis Center URL

Citation

9

WoS Q

Q1

Scopus Q

Source

Volume

38

Issue

1

Start Page

581

End Page

587

URI

https://doi.org/10.1016/j.ceramint.2011.07.046
 https://hdl.handle.net/20.500.14411/1295

Collections

WOS
Scopus