用溶胶-凝胶法制备二氧化钛,在400℃下焙烧4小时,为什么会容易碳化生成的晶体成黑色,不甚感激

我以前用溶胶凝胶法制备过一些硫杂二氧化钛的纳米材料.根据我的经验,这里体系的pH值最为关键.因为pH值如果过高,体系就直接产生二氧化钛沉淀,这个沉淀是一种含有水的黏性沉淀,很难处理.如果pH值过低,就不会有胶凝现象发生.所以需要先用醋酸将pH值降低,然后慢慢加入一些弱碱,比如氨水,让pH值缓慢上升,随时要监控,不能超过限制点（这个限制点要通过实验测定出来）

This experiment was adopted by sol-gel,nitric acid,nitric acid manganese and iron teos,ethanol,deionized water as raw material to process,the preparation of manganese ferrite in spin coating method,and then get manganese ferrite thin sintering get to sample.
Preparation of manganese ferrite sol,high temperature,high will not generate a violent reaction and black consoliated cost.Need to teos drops to keep stirring salt solution,which fully mixing.Got sol should pay attention to adjusting the PH value,make its PH in 2-3.Sol,should put day.Chen
By XRD,sem and magnetic properties of analysis,is helpful to MnFe2O4 / SiO2 composite membrane structure understanding,the correct understanding to the magnetic particles scattered on the structure of the mechanism of silica matrix.Magnetic particle dispersion and stable lies in the structure of silica matrix showed very dependent on the magnetic particle size,showing the characteristics of high magnetic permeability,high strength,low saturation magnetization coercive force and low loss characteristics.
Keywords:sol-gel,magnetic conductivity,saturation magnetization strength,coercive force

In this paper, using sol-gel method cobalt blue ceramic ink, and based on this Zn2 Cr3 + + doping, metal ion of complex blue ink. Experiments discusses different metal ions formula of ink color render...

将固体物质加热到高温以达到脱水、分解或除去挥发性杂质、烧去有机物等目的的操作 称为灼烧(也就是焙烧).焙烧二氧化钛是为了使其改变晶型和性质等.