2491 results about "Barium titanate" patented technology

The invention provides dielectric compositions and methods of forming the same. The dielectric compositions may be used to form dielectric layers in electronic devices such as multilayer ceramic capacitors (MLCCs) and, in particular, MLCCs which include base metal electrodes. The dielectric compositions include a barium titanate-based material and several dopants. The type and concentration of each dopant is selected to provide the dielectric composition with desirable electrical properties including a stable capacitance over a temperature range, a low dissipation factor, and a high capacitance. Preferably, MLCCs including dielectric layers formed with the composition satisfy X7R and / or X5R requirements.

An enhanced piezoelectric wire structure includes an elongated portion of piezoelectric material, a metallic core, and an outer conductive sheath. The metallic core is substantially surrounded by the elongated portion of piezoelectric material and configured to function as a first electrode for the piezoelectric structure. The conductive outer sheath preferably covers selected areas of the elongated portion of piezoelectric material and functions as a second electrode for the structure. The piezoelectric material may correspond to barium titanate ceramic fibers, such that a lead-free structure is effected, however other piezoelectric materials may also be utilized. The disclosed structure can be poled with a reduced poling voltage and lower temperature level, and also requires a reduced voltage potential level required for mechanical actuation. A collection of such piezoelectric structures can be provided together in a modular patch assembly that may be formed in a variety of customized configurations for integration with various environments, and can function as a mechanical actuator device, a condition-responsive device (e.g., a sensor) and / or as a power generation device. When utilized as a power generation device, the subject piezoelectric assembly can power tire electronics components such as a revolution counter, a sensor, a rechargeable battery, a flashing light assembly, a microcontroller, a global positioning system (GPS), and a radio frequency (RF) device.

A multilayer ceramic capacitor containing dielectric layers, in which each of the dielectric layers has a main component containing barium titanate, a first auxiliary component containing at least one kind selected from MgO, CaG, BaO, and SrO, a second auxiliary component containing a silicon oxide as a main component, a third auxiliary component containing at least one kind selected from the group consisting of V2O5, MoO3, and WO3, a fourth auxiliary component containing an oxide of at least one kind of first rare-earth element (R1) selected from Sc, Er, Tm, Yb, and Lu, a fifth auxiliary component containing CaZrO3 or a mixture (CaO+ZrO2) of CaO and ZrO2, and a liquid phase addition of organic metal salts of Zr and Ca.

A low-temperature hydrothermal reaction is provided to generate crystalline perovskite nanotubes such as barium titanate (BaTiO3) and strontium titanate (SrTiO3) that have an outer diameter from about 1 nm to about 500 nm and a length from about 10 nm to about 10 micron. The low-temperature hydrothermal reaction includes the use of a metal oxide nanotube structural template, i.e., precursor. These titanate nanotubes have been characterized by means of X-ray diffraction and transmission electron microscopy, coupled with energy dispersive X-ray analysis and selected area electron diffraction (SAED).