Barium strontium calcium titanate pyroelectric ceramic material and preparation method thereof

Abstract

The invention discloses a barium strontium calcium titanate pyroelectric ceramic material and a preparation method thereof. The barium strontium calcium titanate pyroelectric ceramic material has a composition general formula of Ba0.6(1-x)-(x-0.001) / 2(Sr0.3Ca0.1)1-xYxTi0.999Mn0.001O3, wherein x is not less than 0.001 and not more than 0.010. The preparation method comprises the following steps of: dissolving the Ti(OCH(CH3)2)4 in a mixed solution of organic acid and water; adjusting a pH value to 7.5-8.5; dissolving the Ba(CH3COO)2, Sr(CH3COO)2.0.5H2O, Ca(NO3)2, Y(NO3)3 and Mn(NO3)2 in the water; mixing the two solutions, stirring and adding water to prepare the solution with the mass concentration of 10-20 percent; then adjusting the pH value of the solution to 5.5-6.5; obtaining a precursor solution, and calcining, smashing, screening with a screen and refining; then drying, adding a binder, and executing the steps of pelleting, ageing, screening with the screen, molding and plasticstripping; and finally sintering in the oxygen. The barium strontium calcium titanate pyroelectric ceramic material prepared by the method has a small grain size, large dielectric constant, small dielectric loss, and higher pyroelectric performance, and has the advantages of simple preparation method, short period, low cost and the like, so that the material is suitable for mass production and can meet the industrialization demand.

Description

technical field [0001] The invention relates to a barium strontium titanate calcium pyroelectric ceramic material and a preparation method thereof, belonging to the technical field of pyroelectric ceramic materials. Background technique [0002] Barium strontium titanate (BST, Ba 1-x Sr x TiO 3 , 0≤x≤1) Due to the characteristics of adjustable Curie temperature, high dielectric constant, and low dielectric loss, ceramic materials have become very important candidate materials for pyroelectric uncooled infrared focal planes. [0003] When using BST pyroelectric ceramic materials to make uncooled infrared focal plane devices, it needs to be thinned to tens of microns. This is because the thinner substrate can make the temperature change larger when absorbing the same infrared heat, so that the device can be improved. Sensitivity; In addition, because BST ceramics require an external electric field when working, the thinner the substrate, the lower the required voltage, whic...

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Problems solved by technology

[0004] In order to solve the problem of trade-off between fine grain size and high pyroelectric performance when the grain size is relatively large and the grain size is reduced in the prior art, the invention provides a titanium Barium strontium calcium oxide pyroelectric ceramic material and preparation method thereof, to meet the requirements of current uncooled infrared focal plane devices for BST materials

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