7 results about "Lead tungstate" patented technology

The invention provides a piezoelectric material and a preparation method thereof, a piezoelectric device and electronic equipment, the chemical general formula of the piezoelectric material is xPb (Mn1 / 2W1 / 2) O3-(1-x) [0.15 Pb (Zn1 / 3Nb2 / 3) O3-0.85 Pb (Zr0. 5Ti0. 5) O3], and x is greater than or equal to 0.05 and less than or equal to 0.08. A solid-phase synthesis method is adopted, the mechanical quality factor, the electromechanical coupling coefficient, the piezoelectric constant, the dielectric loss, the Young modulus and the like of the prepared piezoelectric material are improved by doping lead tungstate manganate, regulating and controlling the parameter range of x and controlling the sintering temperature in the synthesis process and preferably adding rare earth elements Yb, Er, Eu and the like, the preparation process is simple, the raw materials are environmentally friendly, and the method is suitable for industrial production. When the piezoelectric material is applied to high-frequency piezoelectric devices and electronic equipment, the use requirements of high performance and low power consumption can be met.

The present application provides a piezoelectric material and a preparation method therefor, a piezoelectric device, and an electronic device. The general chemical formula of the piezoelectric material comprises: xPb(Mn1 / 2W1 / 2)O3-(1-x)[0.15Pb(Zn1 / 3Nb2 / 3)O3-0.85Pb(Zr0.5Ti0.5)O3], wherein 0.05 ≤ x ≤ 0.08. In the present application, a solid-phase synthesis method is used to improve the mechanical quality factor, electromechanical coupling coefficient, piezoelectric constant, dielectric loss, Young's modulus, etc. of the prepared piezoelectric material by doping same with lead tungstate, adjusting the range of parameter x and controlling the sintering temperature during synthesis, and preferably adding rare earth elements Yb, Er, Eu, etc.; and the preparation process is simple, and the raw materials are environmentally friendly. The piezoelectric material, when used in high-frequency piezoelectric devices and electronic devices, can meet the use requirements of high performance and low power consumption.

The invention discloses a carbon fiber reinforced coating, a self-repairing radiation shielding material and a preparation method. The coating is a lead tungstate / epoxy resin carbon fiber reinforced coating; wherein lead tungstate is used as a shell layer, and a hollow core-shell structure is formed on the surface of the carbon fiber. The carbon fiber reinforced coating is constructed on the surface of the carbon fiber so as to improve the self-repairing performance and the radiation shielding performance of the carbon fiber.

This invention belongs to the field of piezoelectric materials and discloses a lead nickel tungstate-lead zirconate titanate piezoelectric ceramic and its preparation method. The general chemical formula of the lead nickel tungstate-lead zirconate titanate piezoelectric ceramic of this invention is: xPb(Ni 1 / 2 W 1 / 2 )O3-yPbZrO3-(1-x-y)PbTiO3+zwt%MnO2; where, 0.05

The invention discloses a fusion radiation imaging diagnostic device based on a lead tungstate array. Comprising a radiation collimator, a scintillator array, a photoelectric converter, a data acquisition unit, an imaging system and a shielding assembly. The radiation collimator is made into a porous grid structure by adopting a high-density heavy metal thick target and is locked at a diagnosis window at the lower part of the fusion device; the scintillator array is a pixelated array formed by a plurality of lead tungstate scintillator units, is arranged in one-to-one correspondence with the collimation micropores, and converts incident high-energy radiation into scintillation light signals; the photoelectric converter is in pixel coupling with the scintillator array pixel pair and converts an optical signal into an electric signal; the data acquisition unit acquires and preprocesses the electric signals and then transmits the electric signals to the imaging system to realize two-dimensional or three-dimensional imaging of radiation distribution. The high density, high atomic number and excellent radiation resistance of lead tungstate are utilized, and a high length-diameter ratio collimation structure is combined, so that the problems of insufficient radiation resistance and lack of spatial resolution capability in a high-flux neutron-gamma mixed radiation environment are solved.

The invention relates to the technical field of material preparation, and discloses a method for preparing tungsten-molybdenum alloy powder through coprecipitation of tungsten molybdate, which comprises the following steps: mixing sodium tungstate, sodium molybdate and water to prepare a tungsten-molybdenum mixed solution; mixing the tungsten-molybdenum mixed solution with a lead salt precipitator; under the stirring state, tungsten and molybdenum are subjected to a co-precipitation reaction; after the reaction, carrying out solid-liquid separation and washing on the slurry to obtain solid which is lead tungstate and molybdate coprecipitation wet slag and liquid which is precipitation mother liquor; drying and grinding the wet slag to obtain lead tungstate and molybdate coprecipitation powder; the lead tungstate and molybdate coprecipitation powder is placed in hydrogen flow, reduction reaction is conducted, and the lead tungstate and molybdate coprecipitation powder is converted into a mixture of tungsten molybdenum alloy powder and elementary substance lead; and then stopping introducing the hydrogen, starting a vacuum pump, and carrying out vacuum treatment, so that the elemental lead is volatilized and condensed into liquid lead in a condensation area to be recovered, and meanwhile, obtaining the unleaded tungsten-molybdenum alloy powder. The high temperature link of the whole process does not exceed 1100 DEG C, so that the energy consumption is obviously reduced, and high-purity tungsten-molybdenum alloy powder and metal lead can be obtained.

The invention provides a lead tungstate scintillation crystal material doped with alkaline earth metal ions and a preparation method thereof.The doped lead tungstate scintillation crystal material is obtained by performing crystal growth through a Bridgman-Stockbarger method and comprises the lead tungstate scintillation crystal material, the alkaline earth metal ions M < 2 + > are doped in the lead tungstate scintillation crystal material, and the chemical formula of the lead tungstate scintillation crystal material is M < 2 + >: PbWO4, the doping amount of the alkaline earth metal ions M < 2 + > is 0.5-15 mol%. According to the technical scheme, the luminescent property of the lead tungstate crystal can be obviously improved through high-concentration doping of alkaline earth metal ions.