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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Tantalate"”.
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Light-induced ferroelectric domain engineering in lithium niobate & lithium tantalate
… engineering in lithium niobate and lithium tantalate is investigated. The conventional method of domain inversion is electric field poling, which suffers from several limitations such as a requirement for photolithography and high-voltage equipment, the formation of inhomogeneous electric …
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Direct UV writing of structures in lithium niobate and lithium tantalate
… write structures in lithium niobate and lithium tantalate. Unassisted direct writing of surface channel waveguides using lambda = 244 nm cw light resulted in polarisation specific waveguides fabricated on z- cut crystals. Waveguides were characterised using mode profiles, propagation losses, …
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Crystal Growth and Structure-Property Relationships for Ferroelectric Strontium Bismuth Tantalate
Discoveries in this thesis suggest that Sr and Bi exchange between the layers and compensated doping, and the weak piezoelectric properties, are the major mechanisms by which SBT shows excellent resistance to fatigue.
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Wideband optical frequency comb generator using a phase velocity-matched lithium tantalate electro-optic modulator
… optical frequency comb generator using lithium tantalate as a modulator substrate.
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Electrocaloric effects in multilayer capacitors of stoichiometric lead scandium tantalate with varying B‑site cation order
… (MLCs) of stoichiometric lead scandium tantalate (PbSc0.5Ta0.5O3 or PST) have been shown to generate large thermal changes (known as electrocaloric, or EC, effects) in response to large changes in applied electric fields sustained without breakdown. These MLCs represent a solid‑state, …
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Use of sol-gels in the application of ceramic oxide thin films
… titanate, lithium niobate, and lithium tantalate. A barium solution can be added to the titania sol to produce a barium titanate compound of the desired composition, including Ba[subscript]2Ti[subscript]9O[subscript]20 and BaTi[subscript]5O[subscript]11. Mixing a lithium solution into …
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Detection of Antibody-Antigen Reactions using Surface Acoustic Wave and Electrochemical Immunosensors
… waves were generated on the surface of lithium tantalate by inductively coupled interdigital transducers to detect antibody-antigen reactions. The electrical properties at the surface of a sensor are also changed when an antibody-antigen reaction occurs. This can be detected by electrochemical …
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Phonon-polaritons in bulk and patterned materials
… microstructures in lithium niobate and lithium tantalate. Phonon-polaritons propagation has been extensively characterized in a number of functional elements, including waveguides, resonators, and various diffractive, reflective, and focusing elements. The experimental results are supplemented …
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Fabrication and applications of zinc indiffused waveguides in periodically poled lithium niobate
… doped PPLN (PPMgLN), periodically poled lithium tantalate (PPLT), and hexagonally poled lithium niobate (HexLN).<br/><br/>Quasi-phase-matched (QPM) wavelength conversion devices based on lithium niobate channel waveguides were realized. Fabrication methods for Zn-diffused channel waveguides in …
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Annealing studies of detector materials for uncooled thermal imaging
… lead zirconate titanate (PZT) or lead scandium tantalate (PST), and then flip-chip bonded to a readout IC (ROIC). Since this is equipment and labour intensive, detectors are expensive to produce and, in addition, the detector structures used limit the achievable noise equivalent temperature …
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THz polaritonics : control, confinement, and strong light-matter interactions
… a thin slab of lithium niobate (LN) or lithium tantalate (LT) that is roughly 30-100 pm thick. Polaritonics is an attractive platform for wave-based computing because of its wealth of capabilities, but still requires the study and development of some critical features before applications can be …
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Topochemical Manipulation of Layered Perovskites
… <p>This reaction series was also applied to the tantalate layered oxides, leading to the formation of the new compound Ni</p> 0.5LaTa2O7 through ion exchange. The further multistep </p> <p> <p>topochemical manipulation of this new compound was not successful and was indicative of the difference …
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Chemically modified Ta₂O₅ thin films for dynamic random access memory (DRAM) applications
… ¹Barium strontium titanate, ²Barium bismuth tantalate
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Developments in THz Polaritonics: Towards Integrated Nonlinear THz Spectroscopy
… μm) lithium niobate (LiNbO₃, LN) and lithium tantalate (LiTaO₃, LT) slabs, which can be patterned to control THz propagation. One of the unique features of the platform is that the THz fields can be imaged directly within the slab with subwavelength spatial resolution and subcycle temporal …
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Synthesis and Characterization of Ferroelectric (1-x)SrBi2Ta2O9-xBi3TaTiO9 thin films for Non-volatile memory Applications
The (1-x)SrBi2Ta2O9-xBi3TaTiO9 thin films fabricated by modified metalorganic solution deposition technique showed much improved properties compared to SrBi2Ta2O9: a leading candidate material for memory applications. A pyrochlore free crystalline phase was obtained at a low annealing temperature …
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Probing interfacial electronic structure in quantum materials using stem cathodoluminescence spectral imaging
… between europium oxide (EuO) and potassium tantalate oxide (KTaO3, KTO) illustrates how interfacial chemistry and symmetry breaking drive the superconductivity. These two systems motivated the structure-property relation study here that is simultaneously structure aware and optically …
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Electrocaloric applications based on multilayer capacitors of PbSc₀.₅Ta₀.₅O₃
Solid-state refrigerants that exhibit electrically driven reversible thermal changes, known as electrocaloric (EC) effects, represent a potentially eco-friendly alternative to the greenhouse gases currently used as refrigerants in refrigerators and heat pumps. The phenomenology of EC effects is …
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Optical properties and structural characterization of ceramic crystals, pellets, and laser-ablation-deposited thin films
This study was divided into two main parts as there were two kind of films studied. The method of deposition, pulsed laser ablation, was common to both SrBi₂Ta₂O₉ and TiO₂ films. The methods of investigations were also the same. There is an important race for the development of a practical …
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Development of Advanced Nanomaterials for Potential Lithium-Ion Battery Application
Lithium-ion batteries (LIBs) are promising energy storage media under serious consideration for practical applications in electric vehicle (EVs) and hybrid electric vehicles (HEVs). However, to meet the requirements for EVs and HEVs, the performance of commercially available LIBs needs to be …
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