Preparation method of lead scandium tantalate pyroelectric ceramics

A technology of pyroelectric ceramics and lead tantalum scandate, which is applied in the field of preparation of lead tantalum scandate pyroelectric ceramics, can solve the problems of deterioration of electrical properties of samples and insufficient compensation for PbO loss, etc. The effect of large electric coefficient

Active Publication Date: 2011-10-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too low an excess of PbO will not be enough to compensate for the loss of Pb

Method used

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  • Preparation method of lead scandium tantalate pyroelectric ceramics
  • Preparation method of lead scandium tantalate pyroelectric ceramics
  • Preparation method of lead scandium tantalate pyroelectric ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Pb(Sc 0.5 Ta 0.5 )O 3 Powder. First according to ScTaO 4 The stoichiometric ratio of Sc 2 o 3 Powder (analytical pure) and Ta 2 o 5 Powder (analytically pure), add 0.8 times of the total weight of raw materials in deionized water, and mix by wet ball milling for 24 hours, so that all components are mixed evenly. Dry it, add 10wt% deionized water, and keep the briquette at 1350° C. for 4 hours to synthesize it. Crush and pass through a 40-mesh sieve.

[0027] Then PbO and ScTaO 4 Weigh and add excess 2.5wt% PbO according to stoichiometric ratio, and mix for 24 hours by wet ball milling. After drying, the briquette was synthesized at 1150°C in the atmosphere, and kept for 2 hours to obtain Pb(Sc 0.5 Ta 0.5 )O 3 Solid solution powder. Then finely grind for 24 hours by wet ball milling method, dry the powder, add 5wt% PVA binder, granulate, age for 24 hours, pass through a 20-mesh sieve, press and mold, and discharge the plastic at 800°C. The sample was hot-p...

Embodiment 2

[0029] In Pb(Sc 0.5 Ta 0.5 )O 3 Add excessive 5wt% PbO in the mixture, repeat the preparation method of Example 1 according to the above formula, and the test results are listed in Table 1.

Embodiment 3

[0031] In Pb(Sc 0.5 Ta 0.5 )O 3 Add an excess of 7.5wt% PbO, repeat the preparation method of Example 1 according to the above formula, and test results are listed in Table 1.

[0032] The main properties (room temperature) of table 1 embodiment material under 900V / mm bias

[0033]

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Abstract

The invention belongs to the field of pyroelectric ceramics, and specifically relates to a preparation method of la ead scandium tantalate pyroelectric ceramics. The method comprises the following steps: first, weighing a PbO powder and a ScTaO4 powder according to stoichiometric ratio, adding an excess 2.5-7.5wt% PbO powder, and mixing by a wet ball milling method to obtain a Pb (Sc0.5Ta0.5)O3 powder; Then carrying out an insulation synthesis on the Pb (Sc0.5Ta0.5)O3 powder to obtain a Pb (Sc0.5Ta0.5) O3 solid solution powder; mixing the Pb (Sc0.5Ta0.5) O3 solid solution powder by ball milling, drying, adding a binder, and carrying out steps of aging, sieving and moulding, etc. to prepare a Pb (Sc0.5Ta0.5) O3 base substrate; at last, carrying out hot pressing sintering on the Pb (Sc0.5Ta0.5) O3 base substrate in an oxygen atmosphere to obtain the lead scandium tantalate pyroelectric ceramics. The preparation method provided by the invention enables a sintering temperature of the leadscandium tantalate to lower to 1290-1320 DEG C, and the lead scandium tantalate pyroelectric ceramics prepared through the method have high pyroelectric performance and can be applied to an uncooled infrared detector.

Description

technical field [0001] The invention belongs to the field of pyroelectric ceramics, in particular to a method for preparing lead tantalum scandate pyroelectric ceramics. Background technique [0002] Infrared detection technology is an important direction for the development of high-tech fields in various countries in the world today. It has extensive applications in military (night vision, remote sensing, detection, homing and guidance, etc.) and civilian (medical diagnosis, traffic monitoring and fire rescue, etc.) Application prospect. Since the mid-1960s, people began to study pyroelectric infrared detectors, and used pyroelectric ceramic materials such as lead titanate (PbTiO 3 , PT), lead zirconate titanate (Pb(Zr x Ti 1-x )O 3 , PZT), barium strontium titanate ((Ba x Sr 1-x )TiO 3 , BST) and lead tantalum scandate (Pb(Sc 0.5 Ta 0.5 )O 3 , PST) as the sensitive element. [0003] PST is a ferroelectric with a perovskite structure, which has two types of struc...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622G01J5/10
Inventor 董显林刘伟王根水姚春华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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