Single Crystal Growth of Ferroelectric Tungsten Bronze Compositions for SAW Applications.
Final rept. 26 Jul 82-31 Dec 83,
ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER
Pagination or Media Count:
Ferroelectric tungsten bronze single crystals were grown by the Czochralski technique. The crystals belong to the tetragonal point group 4mm with spontaneous polarization parallel to the c axis. Room temperature dielectric and piezoelectric measurements indicated that the k 15 and d 15 coefficients are significantly larger for these bigger unit cell bronzes as compared to the smaller unit cell bronzes, e.g. SBN, SKN, etc. The results of this study indicated that since the piezoelectric properties of these crystals are better than SBN, it is expected that these composition crystals should show better acoustical properties. As reported earlier, SBN crystals are known to possess excellent acoustical properties and are useful for device application. Hence, this opens up further new interest in this family of crystals for potential use in SAW device applications. Author