Effect of lithium oxide doping on zinc ferrite formation

被引：20

作者：

ElShobaky, GA

Abdalla, FHA

Zikry, AAF

机构：

[1] CENT MET RES & DEV INST,CAIRO,EGYPT

[2] HELWAN UNIV,FAC SCI,DEPT CHEM,CAIRO,EGYPT

来源：

THERMOCHIMICA ACTA | 1996年 / 289卷 / 01期

关键词：

crystallization; diffusion; doping; ferrite; solid-solid interactions;

D O I：

10.1016/S0040-6031(96)03028-6

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A DTA and XRD study of the effect of Li2O doping on the solid-solid interaction between Fe2O3 and ZnO showed that Fe2O3 and ZnO interacted above 600 degrees C to produce ZnFe2O4. The extent of ferrite formation increases with temperature, but not completely when pure mixed solids are pre-heated at 900 degrees C. These results are attributed to the initially formed zinc ferrite layer inhibiting diffusion of Fe2O3 and ZnO and thus acting as an energy barrier. Li2O doping (1.5 and 3 mol%) stimulated the formation of zinc ferrite to a degree that increased with the amount present. The mechanism of the promotion effect is discussed.

引用

页码：81 / 89

页数：9

共 29 条

[1]

[Anonymous], KINETICS HIGH TEMPER

[2]

ARGHIROPOULOS BH, 1964, J CATAL, V3, P447

[3]

Crisan M., 1983, MAT SCI MONOGR CERAM, P429

[4] SOLID SOLID INTERACTION BETWEEN FERRIC-OXIDE AND SODIUM-NITRATE AND THERMAL-STABILITY OF THE SODIUM FERRITES PRODUCED [J].