Three-dimensional opal–VO2 photonic crystals were prepared by the chemical bath deposition technique. The x-ray diffraction and Raman spectroscopic data confirm the crystalline perfection of VO2 impregnated into synthetic opal pores. It is shown from the optical reflectivity measurements that the photonic bandgap of the opal–VO2 composite is governed by the phase transition in VO2.
Structure and electrical properties at radio frequencies as well as within the 3.5-35 GHz frequency range have been investigated for ceramic samples of the (1 − y)(Ba x Sr 1−x )TiO 3 ·yMgO (BSM) system where x = 0.4-0.6; y = 0.15-0.30. For the compositions studied the bulk ferroelectrics were synthesized with the dielectric constant of 400-600 and high tunability coefficient. We indicated that the quality factor of the samples was in the range of 100-1000 within the frequency band of 3.5-35 GHz. The phase correlations and unit cell constants of the perovskite phase of the BSM samples were studied. The low loss factor and high tunability of the bulk material allowed us using the BSM ferroelectric ceramic layer for tunable accelerating structures of the Argonne Dielectric Wakefield Accelerator and for high power switches design and development for the future linear colliders.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.