Frontiers of Engineering Reports on Leading Edge Engineering from the 1996 NAE Symposium on Frontiers of Engineering (1997) / Chapter Skim
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Novel Ceramic Ferroelectric Composites
Novel Ceramic Ferroelectric Composites
Pages 86-90
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From page 86... ...
SENGUPTA U.S. Army Research Laboratory Aberdeen Proving Ground, Maryland Electronic scanning antennas will be functionally important parts of future commercial and military communications and radar systems.
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From page 87... ...
with other nonelectrically active oxide ceramics producing break-through electronic properties never previously attained (Sengupta et al., 1995~. As shown in Table 1, the bulk ceramic composites have reduced real TABLE 1 Electronic Properties of BaO 6Sr0 4TiO3, BaO 55Sr0 45TiO3, BaO50Sr050TiO3, and BaO45Sr055TiO3/Oxide III Composite Bulk Ceramics, Measured at 1 kHz Barium Oxide ContentDielectric Loss Curie Temp Content (wt%)
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From page 88... ...
This trend was explained previously in the bulk ceramics by the position of the Curie temperatures and the size of the additive (O'Day et al., 1994~. Also, laminated stacks with alternating layers of high and low dielectric constant were fabricated for use in a multilayer TABLE 2 Microwave Properties of BaO 60SrO 40TiO3/Oxide III Composites Oxide III Content (wt%)
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From page 89... ...
We have examined the microstructures, including grain size and phase analysis, using SEM and X-ray diffraction (glancing-angle X-ray diffraction was obtained for the thin-film materials) , and we have investigated compositional topography using Raman and Fourier transform infrared microprobe spectroscopy, which identifies the reaction zones and provides a compositional topography of the specimens.
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From page 90... ...
1994. nec~c~ cbaracter1sUcs of barium strontium titmice oxide composites.
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