Domain engineering in compositionally graded ferroelectric films for enhanced dielectric response and tunability
نویسندگان
چکیده
for enhanced dielectric response and tunability M. B. Okatan, A. L. Roytburd, J. V. Mantese, and S. P. Alpay Materials Science and Engineering Program and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA United Technologies Research Center, East Hartford, Connecticut 06108, USA
منابع مشابه
Dielectric phase-transition and polarization studies in stepped and compositionally graded lead magnesium niobate–lead titanate relaxor thin films
Ferroelectric properties of chemically heterogeneous multilayers and graded composition thin films of 1−x Pb Mg1/3Nb2/3 O3–xPbTiO3, a well-known relaxor, were prepared using a multitarget pulsed laser ablation system. Target materials with different values of x 0.0, 0.1, 0.2, and 0.3 were used for ablation growth. Films with sharp interfaces and graded interfaces were prepared and were characte...
متن کاملCompositionally graded ferroelectric multilayers for frequency agile tunable devices
Recently, there has been significant interest toward the development of tunable dielectric materials for voltage-controlled, frequency-agile phase shifters and filters operating in the microwave regime. The fundamental challenge in designing materials systems for such tunable devices is the simultaneous requirement of high dielectric tunability ([40%) over a large temperature interval (-10 C to...
متن کاملGraded ferroelectric capacitors with robust temperature characteristics
Ferroelectric thin films offer the possibility of engineering the dielectric response for tunable components in frequency-agile rf and microwave devices. However, this approach often leads to an undesired temperature sensitivity. Compositionally graded ferroelectric films have been explored as a means of redressing this sensitivity, but experimental observations vary depending on geometry and o...
متن کاملCompositionally graded ferroelectrics as wide band gap semiconductors: Electrical domain structures and the origin of low dielectric loss
Functional materials with compositional gradients exhibit unique characteristics that are different from the components comprising the structure. Graded ferroelectrics are very good examples to such materials where a systematic variation in composition is introduced along the thickness of a thin film heterostructure. Such structures display interesting properties including the disappearance of ...
متن کاملHigh tunability in compositionally graded epitaxial barium strontium titanate thin films by pulsed-laser deposition
Compositionally graded barium strontium titanate @(BaxSr12x)TiO3—BST, x50.75, 0.8, 0.9, and 1.0# thin films are fabricated by pulsed-laser deposition on a LaAlO3 substrate with (La0.7Sr0.3)MnO3 as the bottom electrode. A high dielectric permittivity and temperature characteristic without Curie–Weiss law are obtained. A tunability of over 70% is obtained at frequency of 1 MHz, which is higher th...
متن کامل