X9R type MLCC ceramic powder based on chitooligosaccharide assisted solid phase synthesis and preparation method thereof

Abstract

This invention provides an X9R type MLCC ceramic powder based on chitosan oligosaccharide-assisted solid-phase synthesis and its preparation method, relating to the field of multilayer chip ceramic capacitor technology. The X9R type MLCC ceramic powder of this invention is prepared using a chitosan oligosaccharide-assisted solid-phase method, and the powder is Ba... 0.985‑y‑ z Bi 0.01 La y Dy z Ti 1‑a‑b‑c Mg a Ho b Ca c O3, where y=0-0.01, z=0-0.01, a=0-0.02, b=0-0.02, c=0.005-0.02; the c / a axis ratio of the powder is ≥1.009, exhibiting a highly tetragonal perovskite structure. The powder prepared by this invention has a dielectric constant ≥12000 (1 kHz), dielectric loss <0.03 (1 kHz), breakdown voltage ≥100 kV / cm, sintering temperature ≤1250℃, and temperature characteristics that meet the EIA X9R standard. This invention introduces chitosan oligosaccharide as a dispersant and complexing agent based on the traditional solid-phase method, combining the advantages of the simplicity of the solid-phase method and the good uniformity of the liquid-phase method. The synthesis process is simple, the batch stability is high, and it can be applied on a large scale.

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