Cryogenic microwave dielectric properties of Mg(2)(TiO(4) ceramics added with CeO(2) nanoparticles

Bhuyan, Ranjan K., Thatikonda, Santhosh K., Dobbidi, Pamu, Renehan, J.M., and Jacob, Mohan V. (2014) Cryogenic microwave dielectric properties of Mg(2)(TiO(4) ceramics added with CeO(2) nanoparticles. Advances in Material Research, 3 (2). pp. 105-116.

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Abstract

The microwave dielectric properties of CeO(2) nanoparticles (0.5, 1.0 & 1.5wt%) doped Mg(2)(TiO(4)(MTO) ceramics have been investigated at cryogenic temperatures. The XRD patterns of the samples were refined using the full proof program reveal the inverse spinel structure without any secondary phases. The addition of CeO(2) nanoparticles lowered the sintering temperature with enhancement in density and grain size as compared to pure MTO ceramics. This is attributed to the higher sintering velocity of the fine particles. Further, the microwave dielectric properties of the MTO ceramics were measured at cryogenic temperatures in the temperature range of 6.5-295 K. It is observed that the loss tangent (tanδ) of all the samples increased with temperature. However, the CeO(2) nanoparticles doped MTO ceramics manifested lower loss tangents as compared to the pure MTO ceramics. The loss tangents of the pure and MTO ceramics doped with 1.5 wt% of CeO(2) nanoparticles measured at 6.5K are found to be 6.6x10^-5 and 5.4x10^-5, respectively. The addition of CeO(2) nanoparticles did not cause any changes on the temperature stability of the MTO ceramics at cryogenic temperatures. On the other hand, the temperature coefficient of the permittivity increased with rise in temperature and with the wt% of CeO(2) nanoparticles. The obtained lower loss tangent values at cryogenic temperatures can be attributed to the decrease in both intrinsic and extrinsic losses in the MTO ceramics.

Item ID: 38305
Item Type: Article (Refereed Research - C1)
Keywords: cyogenic temperatures; microwave dielectric properties; Ce0(2) nanoparticles; densification, microstructure
ISSN: 2234-179X
Funders: Defence Research & Development Organisation (DRDO), Department of Atomic Energy Board of Research in Nuclear Sciences (DAE-BRNS), Board Of Research in Fusion Science & Technology (BRFST), Department of Science and Technology of India (DST)
Projects and Grants: DRDO ERIP/ER/0900371/M/01/1264, DAE-BRNS 2010/20/37P/14BRNS, BRFST NFP-RF-A12-01, DST SR/FTP/PS-109/2009
Date Deposited: 15 May 2015 05:39
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091208 Organic Semiconductors @ 50%
02 PHYSICAL SCIENCES > 0204 Condensed Matter Physics > 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity @ 25%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030502 Natural Products Chemistry @ 25%
SEO Codes: 85 ENERGY > 8598 Environmentally Sustainable Energy Activities > 859899 Environmentally Sustainable Energy Activities not elsewhere classified @ 50%
85 ENERGY > 8504 Energy Transformation > 850499 Energy Transformation not elsewhere classified @ 50%
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