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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Thin Film Piezoelectric Acoustic Emission Sensor with High Sensitivity Up To 650 ∘C
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Linking Domain Structure Evolution at a Grain Boundary to Piezoelectric Response via Nano‐Diffraction
Electric-field-induced domain structure switching in a 1 𝜇m -thick Pb 0.99 (Zr 0.45 Ti 0.55 ) 0.98 Nb 0.02 O 3 (Nb-doped PZT) bicrystal film was characterized in situ via nano-focused synchrotron diffraction. The epitaxial film was deposited on a (100) SrTiO 3 bicrystal substrate. The changes in domain structure were mapped within a 5 𝜇m × 5 𝜇m area at and around an in-plane tilt-type (23.6°) grain boundary with 50 nm spatial resolution. Rocking curves collected at each point of the mapped area provided the ability to reconstruct spatially-varying three-dimensional (3D) reciprocal space maps around the grain boundary. The 3D reciprocal space maps reveal how different tilted 𝑎 -type domain variants interact with the grain boundary as a function of increasing electric field. Initially, a subset of 𝑎 -type domain variants with their polarization vectors largely orthogonal to the grain boundary were found in greater abundance within 570 nm of the grain boundary, possibly due to X-ray beam-induced local increases in the electrical conductivity, but after the coercive field was exceeded, reconfiguration of the ferroelastic domains was observed. The spatially-varying reciprocal space maps also facilitated evaluation of the strain field across the mapped area, along with 𝑑 33,𝑓 . Significant spatial heterogeneity of strain and 𝑑 33,𝑓 are observed, especially at the coercive field, which was attributed to maintaining deformation compatibility and correlated ferroelastic switching.
Computational and Theoretical Modeling of Acoustoelectrically Enhanced Brillouin Optomechanical Interactions in Piezoelectric Semiconductors.
Abstract not provided.
High Dynamic Voltage Range Studies of Piezoelectric Multilayer Actuators at Low Temperatures
Piezo actuators are used for resonance control in superconducting linacs. In high accelerating gradients linacs, such as those operated in a pulsed mode, the piezos require a large operating voltage. This is due to the Lorentz forced detuning which causes a large frequency shift and is compensated with an active piezo-tuning system. In this high dynamic voltage range the piezo is expected to warm up drastically due to it being in an insulated vacuum. This study characterizes the dielectric properties (capacitance, dielectric losses), the piezo stroke (from geophone), and thermal properties such as heating. Results obtained in the temperature range of 20K to 300K will be presented and discussed.
Optimizing the Size and Placement of Piezoelectric Actuators for Modal Testing.
Abstract not provided.
Extending the Frequency of Piezoelectric Resonators to Microwave Frequencies and Beyond.
Abstract not provided.
Optimizing piezoelectric energy harvesting absorbers with mechanical and magnetic amplitude stoppers.
Abstract not provided.
Bandwidth Enhancement Strategies for Acoustic Data Transmission by Piezoelectric Transduction.
Abstract not provided.
Wideband Acoustic Data Transmission Through Staircase Piezoelectric Transducers.
Abstract not provided.
Optimizing the piezoelectric response in AlN thin-films via high-throughput ab-initio perturbation theory simulations.
Abstract not provided.
Study of Different Piezoelectric Material Stroke Displacement with Respect to Temperature Using SRF Cavity
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Using piezoelectric film actuators as excitation sources in modal tests.
Abstract not provided.
Computational and Theoretical Modeling of Acoustoelectrically Enhanced Brillouin Optomechanical Interactions in Piezoelectric Semiconductors.
Abstract not provided.
Marine Energy Harvesting Through Piezoelectric Fluttering Flags
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A miniaturized piezoelectric Mössbauer spectrometer with feedback control
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Automated In-Process Cure Monitoring of Composite Laminates Using a Guided Wave-Based System With High-Temperature Piezoelectric Transducers
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Piezoelectric linear actuator
Actuator exerts linear force that is controllable and reproducible to microinch tolerance. It is constructed for extremely accurate control of a valve but can also be used as a variable venturi meter, micropositioner, microthruster, and in fluidics and reaction-control systems.