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Advances in Materials Research
  Volume 3, Number 2, July 2014 , pages 105-116

Cryogenic microwave dielectric properties of Mg2TiO4 ceramics added with CeO2 nanoparticles
Ranjan K. Bhuyan, Santhosh K. Thatikonda, Pamu Dobbidi and Mohan V. Jacob:

    The microwave dielectric properties of CeO2 nanoparticles (0.5, 1.0 & 1.5 wt%) doped Mg2TiO4 (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 CeO2 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 (tan )of all the samples increased with temperature. However, the CeO2 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 CeO2 nanoparticles measured at 6.5K are found to be 6.6
Key Words
    cyogenic temperatures, microwave dielectric properties, CeO2 nanoparticles, densification, microstructure
Ranjan K. Bhuyan, Santhosh K. Thatikonda, Pamu Dobbidi and Mohan V. Jacob: Department of physics, Indian Institute of Technology Guwahati, Guwahati -39, India

J.M. Renehan: Electronics Materials Lab., School of Engineering and Physical Sciences, James Cook University, Townsville, QLD 4811 Australia

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