Structural, optical, electrical and dielectric properties of Bi<sub>1.5</sub>Zn<sub>0.92</sub>Nb<sub>1.5-x</sub>Ni<sub>x</sub>O<sub>6.92-3x/2</sub> solid solution

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Date

2012

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Taylor & Francis Ltd

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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.

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Abstract

The effects of Ni content on the structural, optical, dielectric and electrical properties of Bi1.5Zn0.92Nb1.5O6.92 pyrochlore ceramics have been investigated. Nickel atoms were inserted into pure samples in accordance to the composition Bi1.5Zn0.92Nb1.5-xNixO6.92-3x/2, with x varying from 0.07 to 0.40. The structural analysis revealed that a single phase of the pyrochlore compound can be obtained for x values of 0.07 and 0.10 only. Further increase in Ni caused the appearance of multiple phases. The optical energy band gaps are determined as 3.30, 3.35 and 3.52 eV for Ni content of 0.00, 0.07 and 0.10 respectively. The temperature dependent electrical resistivity and the frequency dependent capacitance are observed to increase with increasing Ni content. The resonance frequency, which was determined from the capacitance-frequency dependence, was observed to shift from 12.14 to 10.47 kHz as the x values increase from 0.00 to 0.10 respectively.

Description

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

Keywords

Pyrochlore, Chemical synthesis, X-ray scattering, Optical properties, Electrical properties

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Citation

10

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Q2

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Q2

Source

Volume

111

Issue

3

Start Page

165

End Page

170

URI

https://doi.org/10.1179/1743676111Y.0000000058
 https://hdl.handle.net/20.500.14411/1402

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