ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Ferroelectric thick films of Bi3NbTiO9 (BNT) with Aurivillius type structure werefabricated using the airflow deposition method at room temperature. The precursor powder fordeposition was prepared by a conventional mixed oxide route. The BNT films obtained from airflowdeposition had thickness between 25 and 90 μm. Subsequent sintering showed that the films weresinterable at lower temperatures than bulk samples prepared from the same powder using isostaticcold pressing technique. Thick films sintered at 900 0C displayed higher density and a higherelectrical breakdown field compared with bulk samples. SEM microscopy showed similar grain sizefor the thick films sintered at 900 0C and corresponding bulk samples sintered at 1150 0C. Apronounced preferential grain orientation of 70% along the c-axis was observed for thick films withthickness of 252m sintered at 9000C. While the grain orientation in bulk samples was random thegrains in the thick films were aligned along the substrate plane. This significant microstructuraldifference between thick film and bulk samples is believed to be associated with directional nature ofthe deposition process. The novel method allowed anisotropic film formation without applyingpressure during sintering. Low sintering temperature allows reduction in bismuth losses and bettergrain growth control, which also contributes to the advantages of the method
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.165.pdf
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