Surface Modification of Ultra-fine Barium Titanate

Abstract

Abstract: By using solgel method, SiO₂ nanofilms of 5 nm were coated on the surface of ultrafine BaTiO₃. The coated powders and ceramics were analyzed by using HRTEM, XPSand XRDrespectively. The coating mechanism was first reported that water glass solgelated on TiO_2-x surfaces after BaTiO₃ was hydrolyzed slightly. Compared with pure BaTiO₃, SiO₂ coating process can enhance the sintering property at the lower sintering temperatures from 1260 ℃ to 1190 ℃. The ceramic shrinkage mass fraction changes from^-15 to^-19.3. And the coating process improves the dielectric property of ceramics, flatten εT curve. The coating process is promising for the thin layer BaTiO₃based capacitors.

Key words: Surface coating, SiO₂, BaTiO₃, Dielectric properties

CLC Number:

O612.4

TrendMD:

CUI AiLi, CHEN RenZheng, WEI JingZhi, LI LongTu . Surface Modification of Ultra-fine Barium Titanate[J]. Chem. J. Chinese Universities, 2001, 22(12): 2065.

References

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