A kind of method for preparing yttrium zirconate by oxalic acid dihydrazide combustion method

Abstract

The invention provides a method for preparing yttrium zirconate by using an oxalyl dihydrazide combustion process. The method comprises the following steps: adding Y(NO3)3.6H2O and ZrO(NO3)2.H2O into deionized water to prepare a solution and adding an aqueous oxalyl dihydrazide solution into the solution drop by drop so as to obtain a mixed solution; subjecting the mixed solution to stirring, then evaporating water and carrying out heating so as to obtain a fluffy block; and subjecting the fluffy block to heat treatment at 500 to 700 DEG C for 1 to 3 h so as to obtain yttrium zirconate. The method provided by the invention is simple in process, convenient and easy to operate and low in preparation cost. The method can promote low-temperature sintering of powder and is beneficial for synthesis of yttrium zirconate powder with high sintering activity. A reaction system is mild and controllable; a combustion product contains few impurities and is low in loss late; heat released in combustion of oxalyl dihydrazide in a short period of time can promote low-temperature rapid synthesis of yttrium zirconate; and the method has the advantages of energy conservation and environmental protection compared with a conventional high-temperature solid-phase method.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a method for preparing yttrium zirconate by an oxalic acid dihydrazide combustion method. Background technique [0002] In recent years, Re 2 Zr 2 o 7 (Re=rare earth element)-type ternary oxides have attracted great attention of researchers. This type of composite oxide is mainly pyrochlore-type structure (Fd3m space group) or defect fluorite-type structure (Fm3m space group). The pyrochlore-type structure will gradually transform into a defective fluorite-type structure with the decrease of the cation radius ratio. due to Y 3+ has a smaller size, so yttrium zirconate (Y 2 Zr 2 o 7 ) is a defect fluorite structure. [0003] As an important class of functional materials, rare earth zirconates have attracted great attention in their synthesis and properties due to their low thermal conductivity, high thermal expansion coefficient, high stability, and ability...

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Problems solved by technology

Among the above methods, the disadvantage of the high-temperature solid-phase sintering method is that the synthesis temperature is high, the size of the generated product is large, the particle size cannot be controlled, and there is an impure phase due to uneven distribution of components, which has a stoichiometric loss; the simple sol-gel method The disadvantage is that the reaction temperature is higher and the reaction time is longer

The advantage of the hydrothermal method is that it overcomes the disadvantages of uneven distribution of components and stoichiometric loss. However, the requirements for equipment are higher and the reaction time is longer.

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