4 results about "Bi element" patented technology

The invention discloses a novel thermoelectric material based on N-type BiSbSe3 polycrystal and a preparation method thereof, and belongs to the technical field of thermoelectric material preparation, the thermoelectric material is S solid solution and halogen doped N-type BiSbSe3 polycrystal, the chemical general formula of the thermoelectric material is BiSbSe3-x-y SxMy, M is one of Br, Cl and I, the molar ratio of Bi to Sb to Se to S to M is 1: 1: 3-x-y: x: y, x is greater than or equal to 0.12 and less than or equal to 0.48, and y is greater than or equal to 0 and less than or equal to 0.06. The preparation method comprises the following steps: (1) weighing required raw materials including a Bi elementary substance, a Sb elementary substance, a Se elementary substance, Bi2S3 and a halogen introducing substance, ensuring that the molar ratio of Bi to Sb to Se to S to M is 1: 1: (3-x-y): x: y, M is Br or Cl or I, x is more than or equal to 0.12 and less than or equal to 0.48, y is more than or equal to 0 and less than or equal to 0.06, and mixing the raw materials after weighing; and (2) carrying out high-temperature melting synthesis reaction on the mixed raw materials, and cooling along with a furnace after the reaction is finished, so as to finally obtain the N-type BiSbSe3 polycrystal. The problems that in the prior art, when BiSbSe3 is prepared, a quenching technology is needed for assistance, energy consumption is large, time is long, and part of media are low in safety and not environmentally friendly are solved.

The invention provides a Bi-based material for X-ray detection and protection and a preparation method and application thereof, and belongs to the technical field of X-ray detection and protection. According to the invention, the Bi-based material is BiO (IO3), BiVO4 or Bi2WO6; the preparation method comprises the following steps: mixing an I2O5 solution and a BiH10N3O14 suspension, and reacting to obtain BiO (IO3); the preparation method comprises the following steps: mixing Bi (NO3) 3.5 H2O, NH4VO3 and a nitric acid solution, and dropwise adding ammonia water into the mixed solution until yellow precipitate appears, so as to obtain BiVO4; the preparation method comprises the following steps: mixing a Na2WO4. 2H2O solution and a Bi (NO3). 5H2O suspension, and reacting to obtain Bi2WO6. The Bi-based material disclosed by the invention has excellent X-ray detection performance and protection effect, and due to the extremely high atomic number of the Bi element, the high equivalent atomic number and density of the material are finally formed, so that full absorption of X-rays is realized.

This invention provides a high-temperature stable pulse energy storage ceramic composition and its preparation method, relating to the field of pulse energy storage ceramic materials technology. The ceramic composition is based on Ba(Zr) x Ti 1‑x The main component is a perovskite compound (Bi2O3). In addition, it contains Bi as a first secondary component (Bi element) in the form of a composite of Bi2O3 and Bi2O3·nTiO2, as well as Ca, Sr, Mg, Mn, and Si elements. Its temperature coefficient of dielectric constant (TCC) meets -750±120ppm / ℃ over a wide temperature range of -55℃ to 125℃. The ceramic composition of this invention possesses high dielectric constant, low dielectric loss, high breakdown field strength, and a fine-grained structure, making it suitable for high-reliability pulse power capacitors.

The application provides a lead-based catalyst regulated by cobalt-bismuth bimetal, a preparation method and application thereof. The catalyst comprises a carrier, and a catalytic material composed of cobalt-doped lead oxide and bismuth oxide is loaded on the surface of the carrier, and the chemical composition of the catalytic material is expressed as Co x Bi y Pb m O n The preparation method of the catalyst comprises the following steps: taking lead salt, cobalt salt and bismuth salt as metal precursors, taking boric acid as a buffer, taking trisodium citrate dihydrate as a complexing agent, and adopting a two-step electrodeposition method to prepare the catalyst. The catalyst can be used for synthesizing sodium borohydride by an electrocatalytic method. In the application, Pb elements are used as main components of electrode materials, a small amount of Co elements and Bi elements are added as additives, and under the joint action of the two additives, the efficiency of the electro-reduction reaction can be effectively improved, and the yield of sodium borohydride is improved.