TITLE

Electrophoretic deposition of pure and MgO-modified Ba[sub 0.6]Sr[sub 0.4]TiO[sub 3] thick films for tunable microwave devices

AUTHOR(S)
Ngo, E.; Joshi, P. C.; Cole, M. W.; Hubbard, C. W.
PUB. DATE
July 2001
SOURCE
Applied Physics Letters;7/9/2001, Vol. 79 Issue 2
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on the structural, dielectric, and optical properties of barium strontium titanate–magnesium oxide composite (BST-MgO) thick films fabricated by the electrophoretic deposition technique. The structure and morphology of the films were analyzed by x-ray diffraction and scanning electron microscopy, respectively. The films were optically characterized via FT-Raman spectroscopy. The dielectric measurements were conducted on metal–insulator–metal capacitors using platinum as the top and bottom electrodes. The typical small signal dielectric constants of Ba[sub 0.60]Sr[sub 0.40]TiO[sub 3] and Ba[sub 0.60]Sr[sub 0.40]TiO[sub 3]–20 wt % MgO thick films, measured at an applied frequency of 1 MHz, were 603 and 327, respectively. The corresponding values of dissipation factor were 0.029 and 0.002, respectively. A high dielectric tunability of 17.3% was obtained for Ba[sub 0.60]Sr[sub 0.40]TiO[sub 3] thick films at an applied electric field of 20 kV/cm. The dielectric properties of the present thick films were comparable to those of the bulk ceramics; suggesting their suitability for high-frequency wide-band voltage-tunable device applications.
ACCESSION #
4758982

 

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