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Microstructural and dielectric properties of Zr doped microwave sintered CaCu3Ti4O12 synthesized by sol-gel route


Jesurani, Sinnappan and Kanagesan, Samikannu and Hashim, Mansor and Ismail, Ismayadi and Ibrahim, Idza Riati (2014) Microstructural and dielectric properties of Zr doped microwave sintered CaCu3Ti4O12 synthesized by sol-gel route. Advances in Materials Science and Engineering, 2014. art. no. 187420. pp. 1-6. ISSN 1687-8434; ESSN: 1687-8442


Polycrystalline samples with the chemical formula CaCu3 Ti 4 - x Zrx O12 (x = 0, 0.02, 0.1, 0.2, 0.5, and 0.1) CCTZO were synthesized from metal nitrate solutions by the sol-gel method, followed by conventional and microwave heat treatments. The X-ray diffraction pattern of powder calcined at 800°C in conventional furnace for 3 h showed formation of a single phase. The crystal structure did not change on doping with zirconium and it remained cubic in the five studied compositions. The surface morphology of samples sintered at 1000°C in microwave furnace for 10 min was observed using a high resolution scanning electron microscope (HR-SEM). The grain sizes were in the range of 250 nm-5 m for these samples. HRSEM results show that doping with Zr enhanced grain growth or densification. Energy dispersive X-ray spectroscopy (EDX) confirmed the presence of Zr. The dielectric characteristics of Zr doped CCTO were studied with an LCR meter in the frequency range of 50 Hz-1 MHz. A very high dielectric constant 21,500 was observed for the sample doped with Zr (0.02 mol%) at 50 Hz.

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Additional Metadata

Item Type: Article
Divisions: Institute of Advanced Technology
DOI Number: https://doi.org/10.1155/2014/187420
Publisher: Hindawi Publishing Corporation
Keywords: Ceramics; Dielectric properties; Zr doped; Sol-gel method; Microwave sintering
Depositing User: Nabilah Mustapa
Date Deposited: 05 Jun 2017 04:23
Last Modified: 05 Jun 2017 04:23
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1155/2014/187420
URI: http://psasir.upm.edu.my/id/eprint/52177
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