Nanocrystalline plumbum stannate powder preparation method

Abstract

The invention relates to a process for preparing nanocrystalline lead stannate, in particular a process for preparing ferro-electrical functional ceramic material, wherein water dissoluble inorganic salt precursor is utilized, the raw material being, PbNO3 (analytical pure), SnCl45H2O (analytical pure), NaOH (analytical pure), HNO3 (analytical pure), and the preparation process comprises the steps of, producing solution A by dissolving PbNO3 and SnCl4-5H2O with mol ratio 1:1 into HNO3 solution, then dissolving NaOH into deionized water to prepare solution B with pH=12, dropping solution an into solution B of equal quantity, maintaining the temperature at 80 deg. C, stirring about 8 hours by magnetic stirrer, maintaining pH=11, thus obtaining lacte colloidal sol, finally heating and dehydrating to obtain the high purity PbSnO3 polycrystalline powder of 10 nm sizes.

Description

technical field [0001] The invention belongs to the field of ceramic materials, in particular to a preparation method of a ferroelectric functional ceramic material. Background technique [0002] Lead stannate PbSnO 3 It is a new type of ferroelectric functional ceramic material developed in recent years. It can be solid-soluted or compounded with Ba, Sr or B-site and Ti, Zr and other elements at the A site to make multilayer capacitor ceramics, humidity sensors, etc., with broad application prospects. For ABOs 3 For perovskite compounds, PbSnO 3 The tolerance factor ratio of BaSnO 3 Small, poor electronegativity is also small, but they are all within the stable range of perovskite compounds, but the synthesis of pure PbSnO 3 very difficult. Shirasaki et al synthesized amorphous PbSn by chemical co-precipitation method x Ti 1-x o 3 , did not get pure PbSnO 3 Compound; Sugawara et al synthesized monoclinic PbSnO by high temperature and high pressure method 3 , trans...

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Problems solved by technology

Our study found that PbSnO 3 It is a high-temperature unstable compound and decomposes above 800°C, so it cannot be prepared by conventional solid-phase synthesis

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