Cerium doping zirconium tungstate negative heat expansion conductive ceramic powder and preparation method thereof

A technology of negative thermal expansion and conductive ceramics, applied in the direction of non-metallic conductors, etc., can solve the problems of low purity of zirconium tungstate-based compounds, difficult doping, high reaction temperature, etc., to avoid high-temperature sintering procedures, simplify synthesis processes, and sample purity Improved effect

Inactive Publication Date: 2008-05-28
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, at present, the A-site doping of zirconium tungstate is relatively difficult, and it is mainly synthesized by solid-phase method.
Since the solid-phase method requires a high reaction temperature, which should be realized at about 1200 ° C, and tungst...

Method used

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  • Cerium doping zirconium tungstate negative heat expansion conductive ceramic powder and preparation method thereof
  • Cerium doping zirconium tungstate negative heat expansion conductive ceramic powder and preparation method thereof

Examples

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Embodiment 1

[0017] Using this invention to synthesize Zr 0.99 Ce 0.01 W 2 o 8 . Weigh 2.7129 grams of ZrOCl 2 ·8H 2 O, 4.4418 g 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O and 0.0468 g (NH 4 ) 2 Ce(NO 3 ) 6 as raw material. ZrOCl 2 ·8H 2 O and (NH4) 2 Ce(NO3 ) 6 mixed and dissolved in deionized water to make Ce 4+ and Zr 4+ The sum of the concentrations is 0.1mol L -1 , 5(NH 4 ) 2 O·12WO 3 ·5H 2 O is also dissolved in deionized water, so that the W in the solution 6+ The concentration is also 0.1mol L -1 . Mix deionized water and concentrated hydrochloric acid to a concentration of 6mol L -1 hydrochloric acid solution for use. ZrOCl was added by double drop method 2 and (NH4) 2 Ce(NO 3 ) 6 mixed solution of 5(NH 4 ) 2 O·12WO 3 ·5H 2 The O solution was added to 25ml of deionized water, stirred while adding dropwise, and the temperature of the mixed solution was controlled at 60° C. and stirred for 4 hours. Next, raise the temperature of the mixture to 80°C, and add 6 ...

Embodiment 2

[0020] Using this invention to synthesize Zr 0.98 Ce 0.02 W 2 o 8 . Weigh 2.6855 grams of ZrOCl 2 ·8H 2 O, 4.4418 g 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O and 0.0936 g (NH4) 2 Ce(NO 3 ) 6 as raw material. ZrOCl 2 ·8H 2 O and (NH4) 2 Ce(NO 3 ) 6 mixed and dissolved in deionized water to make Ce 4+ and Zr 4+ The sum of the concentration is 0.4mol L -1 , 5(NH 4 ) 2 O·12WO 3 ·5H 2 O is also dissolved in deionized water, so that the W in the solution 6+ The concentration is also 0.4mol L -1 . Mix deionized water and concentrated hydrochloric acid to prepare a concentration of 10mol L -1 hydrochloric acid solution for use. ZrOCl was added by double drop method 2 and (NH4) 2 Ce(NO 3 ) 6 mixed solution of 5(NH 4 ) 2 O·12WO 3 ·5H 2 The O solution was added to 50ml of deionized water, stirred while adding dropwise, and the temperature of the mixed solution was controlled at 80°C and stirred for 8h. Next, raise the temperature of the mixture to 90°C, and add 10...

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Abstract

The invention provides a negative-thermal expansion and conductive ceramic powder body of Ce-doped zirconium tungstate and a preparation method thereof. The material comprises the component: Zr1-xCexW2O8 (wherein, the x is more than zero and less than or equal to 0.02); the preparation adopts the components ZrOCl2.8H2, 5(NH4)2O.12WO3.5H2O and (NH4)2Ce(NO3)6 as precursors, and uses a hydrothermal synthetic method. The negative-thermal expansion and conductive ceramic powder body of Ce-doped zirconium tungstate of the invention has not only negative thermal expansion, but also conductivity under the temperature of 350 to 700 DEG C. Compared with the traditional sintering method, the hydrothermal synthetic method avoids high-temperature sintering process, thus saving energy and simplifying synthetic technique.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to the preparation of negative thermal expansion ceramics which can be used in the range of 350-700 DEG C and have electrical conductivity. Background technique [0002] Negative expansion materials have high research and practical application value, and the volume of such materials exhibits negative expansion characteristics as the temperature changes. These materials are used in a wide range of applications, from everyday products to aerospace. At present, many materials have been reported to have negative expansion properties, such as: cubic negative thermal expansion material ZrW 2 o 8 , has isotropic negative thermal expansion properties, and the negative expansion coefficient is -8.7×10 -6 K -1 ; Orthogonal structure Sc 2 (WO 4 ) 3 ; Negative expansion coefficient is -6.5×10 -6 K -1 ; CuLaO with delafossite structure 2 It is also a material with negative...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622H01B1/06
Inventor 邢献然孙策赵洁陈茜陈骏于然波刘桂荣
Owner UNIV OF SCI & TECH BEIJING
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