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

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...

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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 tungsten trioxide, one of the synthetic raw materials of the solid-phase method, is volatile at high temperature, the purity of the synthesized zirconium tungstate-based compound is relatively low [see the literature Journal of Solid State Chemistry 180 (2007) 852-857]

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