Sinterability and microwave dielectric properties of nano structured 0.95MgTiO sub(3)-0.05CaTiO sub(3) synthesised by top down and bottom up approaches

0.95MgTiO sub(3)-0.05CaTiO sub(3) (MCT) nano powders were synthesised using sol-gel method and high energy ball milling (HEBM). Synthesised powders were characterised using X-ray diffraction analysis to ensure phase purity and HRTEM to determine the fine microstructural features like particle size,...

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Bibliographic Details
Published in:Journal of alloys and compounds 2011-02, Vol.509 (6), p.3089-3095
Main Authors: Sanoj, MA, Reshmi, C P, Sreena, K P, Varma, Manoj Raama
Format: Article
Language:English
Subjects:
Alloys
Dielectric properties
Microwaves
Nanocomposites
Nanomaterials
Nanostructure
Sinterability
Sol gel process
Solid state
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Summary:0.95MgTiO sub(3)-0.05CaTiO sub(3) (MCT) nano powders were synthesised using sol-gel method and high energy ball milling (HEBM). Synthesised powders were characterised using X-ray diffraction analysis to ensure phase purity and HRTEM to determine the fine microstructural features like particle size, interplanar spacing, etc. The powder pellets were heat treated to study the sinterability and microwave dielectric properties and these properties were then compared with the microwave dielectric properties of micron sized sample. Nano powder synthesised using HEBM shows better dielectric properties, sinterability and gets densified to 90% of theoretical density (TD) at 1200 degree C/2 h. Dielectric resonators prepared using chemically synthesised nano powder showed poor sinterability and microwave dielectric properties, but, dielectric properties of HEBM samples were very near to that of solid state synthesised samples. Sintered HEBM powders retain the microwave dielectric properties almost to the same level as the solid state synthesised powder with considerable lowering of sintering temperature.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2010.12.006