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| Title: | Synthesis and dielectric properties of magnesium niobate -magnesium tantalate solid solutions |
| Authors: | Thirumal, M
Ganguli, A K |
| Keywords: | Ceramics
Electronic materials
Oxides |
| Issue Date: | 2001 |
| Citation: | Materials Research Bulletin, 36(13-14), 2421–2427 |
| Abstract: | Monophasic Oxides of the type MgNb2−xTaxO6 (0 ≤ x ≤ 2) have been synthesized by solid-state reactions using Mg(NO3)2·6H2O as the source of Mg. The oxides crystallize in the orthorhombic columbite structure till X = 1.75 and the tetragonal trirutile structure for pure MgTa2O6 (x = 2.0). Sintered pellets at 1200°C show dielectric constant varying between 16 to 28 for the entire range of composition at a frequency of 500 kHz. The dielectric loss is nearly constant with frequency, and varies between 0.004 and 0.01 for different compositions. The temperature coefficient of dielectric constant (τE) is 3 to −3 ppm/C (30 to 300°C). Scanning electron micrographs reveal a gradual decrease in grain size with increase in Ta concentration with size of 7 to 10 microns for the pure Nb phase sintered at 1200°C while the pure Ta phase shows a grain size of approximately 0.5 to 1 microns. |
| URI: | http://eprint.iitd.ac.in/dspace/handle/2074/853 |
| Appears in Collections: | Chemistry
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| thirumalsyn2001.pdf | | 224Kb | Adobe PDF | View/Open |
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