Fe-doped PbTiO_(3)(PT)powder and bulk materials were prepared successfully by sol-gel technique and a subsequent sintering process using Fe(C_(5)H_(5))_(2)as a dopant agent.The effects of pH and temperature on the Fe-...Fe-doped PbTiO_(3)(PT)powder and bulk materials were prepared successfully by sol-gel technique and a subsequent sintering process using Fe(C_(5)H_(5))_(2)as a dopant agent.The effects of pH and temperature on the Fe-doped PT system were investigated.Thermogravimetry/differential thermal analysis(TG/DTA),X-ray diffraction(XRD)and scanning electron microscopy(SEM)were used to analyze the composition and the microstructure of the PT ceramics.The results indicated that the thermal decomposition of xerogel included three stages:volatilization of adsorption water and organic composition,oxygenolysis of n-butyl and acetate,and transformation of the crystalline phase.Well-stabilized collosol and gel could be obtained at 60uC and pH54.5.It was found that PbTiO_(3),PbFe_(2)O_(4),and TiO_(2)crystalline appeared in the Fe-doped PT system when the mass fraction of the dopant Fe was 0.03%.Furthermore,from STM analysis,it could be seen that the grain size of doped PT ceramics was homogeneous and about 1–2 mm,and the pore of the PT ceramic was small.As a result,the PT ceramic had high tightness.展开更多
文摘Fe-doped PbTiO_(3)(PT)powder and bulk materials were prepared successfully by sol-gel technique and a subsequent sintering process using Fe(C_(5)H_(5))_(2)as a dopant agent.The effects of pH and temperature on the Fe-doped PT system were investigated.Thermogravimetry/differential thermal analysis(TG/DTA),X-ray diffraction(XRD)and scanning electron microscopy(SEM)were used to analyze the composition and the microstructure of the PT ceramics.The results indicated that the thermal decomposition of xerogel included three stages:volatilization of adsorption water and organic composition,oxygenolysis of n-butyl and acetate,and transformation of the crystalline phase.Well-stabilized collosol and gel could be obtained at 60uC and pH54.5.It was found that PbTiO_(3),PbFe_(2)O_(4),and TiO_(2)crystalline appeared in the Fe-doped PT system when the mass fraction of the dopant Fe was 0.03%.Furthermore,from STM analysis,it could be seen that the grain size of doped PT ceramics was homogeneous and about 1–2 mm,and the pore of the PT ceramic was small.As a result,the PT ceramic had high tightness.
