Nanocrystalline plumbum stannate powder preparation method
A technology of crystalline lead stannate and powder, which is applied in the field of preparation of ferroelectric functional ceramic materials, to achieve the effect of improving ferroelectric performance, simple method and improving preparation process
Inactive Publication Date: 2004-11-10
UNIV OF SCI & TECH BEIJING
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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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[0012] 7.0865 g of PbNO 3 and 7.5011 g of SnCl 4 ·5H 2 O (molar ratio Pb / Sn=1) was dissolved in 500 mL of 1M HNO 3 Solution is made solution A; The NaOH of 6.1613 grams is dissolved in 500 milliliters of deionized water again, is made into solution B; A solution is dripped into B solution, and temperature is maintained on 80 ℃, and constantly stirs on magnetic stirrer (about 8 hours), the pH value was maintained at 11, and a milky white sol was obtained. After two days of formation, a light yellow-white gel was obtained, which was heated and dehydrated at 110°C to obtain high-purity PbSnO with a size of 10nm. 3 polycrystalline powder.
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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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IPC IPC(8): C01G19/00C04B35/453C04B35/624
Inventor 邢献然陈骏邓金侠刘桂荣
Owner UNIV OF SCI & TECH BEIJING
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