38results about How to "High dielectric tunability" patented technology

A strontium barium titanate-based composite zinc gallate ceramic dielectric material with high adjustable rate and low loss is characterized in that the component general formula of the strontium barium titanate-based composite zinc gallate ceramic dielectric material with high adjustable rate and low loss is is: (1‑x)Ba 0.4 Sr 0.6 TiO 3 ‑xZnGa 2 o 4 , where the value range of x is 10 wt%≤x≤70 wt%, choose BaTiO 3 Powder, SrTiO 3 powder, ZnO powder and Ga 2 o 3 Powder as the main raw material according to (1‑x)Ba 0.4 Sr 0.6 TiO 3 ‑xZnGa 2 o 4 The ingredients are ball milled, dried, and pre-fired at high temperature to obtain a mixed powder. After tableting, the glue is removed at a temperature of 550°C~600°C and then fired at a temperature of 1250°C~1300°C. The strontium barium titanate-based composite zinc gallate ceramic dielectric material with high adjustable rate and low loss prepared by the invention can be continuously adjusted in a wide range and has high comprehensive performance.

The invention belongs to the field of electronic material and apparatus, in particular relates to a dielectric adjustable double-phase composite microwave ceramics material. A low-temperature sintering microwave ceramics material disclosed in the invention comprises components with the following weight percentage: 40.0 wt% to 97.5 wt% of Ba(1-x)SrxTiO3, 2.5 wt% to 60.0 wt% of Zr(1-y)SnyTiO4, as well as 0 wt% to 15.0 wt% of ZnO. The invention develops the double-phase composite microwave ceramics material which has the advantages of dielectric constant seriation, low dielectric loss (high Q value) and higher modulation rate under a microwave frequency band and can be used on an adjustable microwave apparatus by carrying out composition to a microwave medium material Zr1-ySnyTiO4 and strontium-barium titanate ferroelectric material.

The invention discloses a barium strontium titanate dielectric material for a microwave tuning device. The general chemical formula of the barium strontium titanate dielectric material is (Ba x Sr 1‑x ) 1+δ TiO 3 , where x=0.2~0.4, δ=-0.02~0.02. Different from the traditional BST material system with high dielectric constant and generally low quality factor, the BST material of the present invention has high dielectric constant and high quality factor while maintaining high dielectric tunability, which can greatly improve The dielectric performance of the BST material on microwave tuning devices, the BST material of the present invention can achieve better material performance without doping or adding other elements or phases, and its cost is controllable and easy to manufacture.

The invention discloses an epitaxial lead strontium titanate film with a lithium nickelate buffer layer and a preparation method. A layer of buffer layer conductive electrode LNO film is deposited on one side of the MgO substrate, and a perovskite phase PST film is deposited on the buffer layer conductive electrode LNO film. The steps are as follows: firstly, using lithium carbonate, nickel oxide, lead carbonate, strontium carbonate and titanium oxide as raw materials, respectively preparing lithium nickelate target material and strontium lead titanate target material by solid-phase sintering method; secondly, using (001) MgO substrate After cleaning, it was put into the reaction chamber, the reaction chamber was evacuated, and the substrate was heated. Oxygen was used as a protective gas, introduced into the reaction chamber, and the target was sputtered by pulsed laser, and the lithium nickelate buffer layer and strontium lead titanate were epitaxially deposited on the substrate successively. film. The preparation method of the invention is simple, the prepared strontium lead titanate thin film has good epitaxy and high quality, and the dielectric adjustability of the thin film can reach 40% to 70%.

This invention relates to a dielectric adjustable and two-phase composite ceramic material. It is of two-phase composite micro-wave ceramic material, with its representation of: Ba(1-x)SrxTiO3-Zn2TiO4, the components are: Ba(1-x)SrxTiO3(x=0.3-0.6)80.0wt%-20.0wt%,Zn2TiO4 20.0wt%-80.0wt%. The system curie temperature can be regulated widely by the ratio of Ba / Sr. According working temperature requirements of the designed adjustable micro-wave device, we can regulate the system structure and properties of the material. This inventive product is suitable for design and development of adjustable micro-wave device and electrically adjustable medium functional module, and suitable for design and development of low-temperature co-sintered ceramic device and multiple-layered functional device.