lithium tantalum oxide
A new lithium insertion compound (lithium, copper) tantalum oxide, (Li, Cu)TaO3, with the LiNbO3-type structure.
Enhanced lithium-ion intercalation and conduction of ...
Tantalum oxide (TaO x ) thin films have highly attracted attention for application as proton-conducting  or Li-ion conducting  electrolyte layers in EC devices. ... In this study, organo-lithium oxide (LiO y C z ) is co-synthesized with organo-tantalum oxide (TaO y C z ) by an APPJ.
An investigation is conducted on enhancing lithium-ion intercalation and conduction performance of transparent organo tantalum oxide (TaO y C z ) films, by addition of lithium via a fast co-synthesis onto 40 Ω/□ flexible polyethylene terephthalate/indium tin oxide substrates at the short exposed durations of 33–34 s, using an atmospheric pressure plasma jet (APPJ) at various mixed concentrations of tantalum ethoxide [Ta(OC2H5)5] and lithium tert-butoxide [(CH3)3COLi] precursors.
Transparent organo-lithiated tantalum oxide (Li x TaO y C z ) films expose noteworthy Li+ ion intercalation and conduction performance for 200 cycles of reversible Li+ ion intercalation and deintercalation in a 1 M LiClO4-propylene carbonate electrolyte, by switching measurements with a potential sweep from −1.25 to 1.25 V at a scan rate of 50 mV/s and a potential step at −1.25 and 1.25 V, even after being bent 360° around a 2.5-cm diameter rod for 1000 cycles.
The Li+ ionic diffusion coefficient and conductivity of 6.2 × 10−10 cm2/s and 6.0 × 10−11 S/cm for TaO y C z films are greatly progressed of up to 9.6 × 10−10 cm2/s and 7.8 × 10−9 S/cm for Li x TaO y C z films by co-synthesis with an APPJ.
Growth of tantalum oxide and lithium tantalate thin films
Thin films of tantalum oxide and lithium tantalate have been grown on Si (100) and Si (111) substrates by molecular beam epitaxy.
At the tantalum deposition rates of 0.3 Å s−1, the use of molecular oxygen in the growth process yielded only partially oxidized films.
A complete in situ oxidation of the grown layers has been achieved by the use of an ECR plasma source.
Tantalum oxide thin films were amorphous in structure due to the low substrate temperature.
Lithium tantalate thin films showed a stoichiometric composition and were fully oxidized in situ as proved by quantitative XPS analysis.
X-ray diffraction revealed a preferentially oriented polycrystalline structure with the (102) planes of LiTaO3 being parallel to the (100) planes of Si.
Lithium Insertion, Abstract Lithium uptake, and release by pure, morphology‐controlled ... Characteristics of Nanostructured Amorphous Tantalum Oxide Thin
Nanoporous titanium niobium oxide
Nanoporous metal oxide framework compositions are useful as anodic materials in a lithium-ion battery
An electrode (110) is provided that may be used in an electrochemical device (100) such as an energy storage/discharge device, e.g., a lithium-ion battery, or an electrochromic device, e.g., a smart window.
Hydrothermal techniques and vacuum filtration methods were applied to fabricate the electrode (110).
The electrode (110) includes an active portion (140) that is made up of electrochemically active nanoparticles, with one embodiment utilizing 3d-transition metal oxides to provide the electrochemical capacity of the electrode (110).
The active material (140) may include other electrochemical materials, such as silicon, tin, lithium manganese oxide, and lithium iron phosphate.
The electrode (110) more » also includes a matrix or net (170) of electrically conductive nanomaterial that acts to connect and/or bind the active nanoparticles (140) such that no binder material is required in the electrode (110), which allows more active materials (140) to be included to improve energy density and other desirable characteristics of the electrode.
The matrix material (170) may take the form of carbon nanotubes, such as single-wall, double-wall, and/or multi-wall nanotubes, and be provided as about 2 to 30 percent weight of the electrode (110) with the rest being the active material (140).
The pyroelectric effect is one of the phenomena that can convert dissipated thermal energy into useful electric energy.
Pyroelectric energy conversion from Lithium Tantalum Oxide (LiTaO3) crystal is evaluated by the dynamic optical Chynoweth method.
To improve conversion efficiency, an efficient a.c./d.c.
converter for the harvester and variable load is developed.
Analysis and experimental research were conducted over a range of resistive load and chopping frequencies in order to optimize the energy harvesting process by implementing impedance matching for maximum power transfer.
In this experiment, direct current (d.c.) at nA level and voltage (d.c.) of 100 mV level is measured for several frequency and loaded conditions.
After comparing the results at different conditions, the best output is identified for chopping frequency at around 4Hz for 20 MΩ resistive load, by providing cyclic temperature fluctuations of around 1.25 K/s on a single crystal lithium tantalum oxide (LiTaO3).
The generated pyroelectric current is converted from a.c.to d.c. by a voltage doubler.
Chopping frequency range between 2Hz-6Hz and load range between 10MΩ-40MΩ are found important for optimum power generation from a 0.5mm thick LiTaO3 sample with a surface area of 19.64 cm2.
The potential for utilizing pyroelectric crystal in self-powered ultra-low-power electronic devices are being further explored.
Tantalum Oxide & Tantalum Pentoxide Applications
Tantalum pentoxide is primarily utilized in the production of optical glass and lithium niobate.
TANTALUM PENTOXIDE or TA2O5
Tantalum (V) oxide (Ta2O5 or tantalum pentoxide) is a white, stable solid compound inert to all chemicals except for hydrofluoric acid and concentrated alkaline solutions. The powder is produced by precipitating a tantalum-containing acid solution, filtering the precipitate, and calcining the filter cake. It is often milled to the desirable particle size to meet various application requirements.
Tantalum oxide is a high reflective index and low light absorption material. Ta2O5 has been used in optical glass, fiber, and other instruments.
Due to its high dielectric constant, the tantalum oxide sputtering target has been used for the production of semiconductors used in DRAM, high-frequency CMOS integrated circuits, and flash memory.
Lithium tantalite ( Li TaO 3) single crystal is another use for tantalum oxide.
The crystal is used in optical waveguides, mobile phones, piezoelectric sensors, optical modulators, and various other optical applications.
The properties of tantalum oxide in electrolytic capacitors ...
The tantalum electrolytic capacitor can be considered as a parallel plate capacitor in which tantalum metal is one electrode, a tantalum oxide film is the. ... Examples of liquid electrolytes used are sulphuric acid or lithium chloride solutions.
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