摘要
研究了包敷磷酸盐和稀土氧化物对α-FeOOH分散性、γ-Fe_2O_3热稳定性和磁性能的影响规律。结果发现,包敷磷酸盐能明显提高γ-Fe_2O_3磁性能。此类包敷剂的作用效应为六偏磷酸钠>高聚磷酸钠>焦磷酸钠。La_2O_3可阻止γ-Fe_2O_3烧结和相变,该作册源于La^(3+)在γ-Fe_2O_3晶格母体的填隙和La_2O_3与γ-Fe_2O_3间的界面化学作用。
The influences of coated phosphate and rare earth metal oxide on dispersion of ultrafine geothite, thermal stability and magnetism of γ-Fe_2O_3 were studied. It was shown that the coated phosphate can obviously enhance the magnetism of γ-Fe_2O_3 and the coating effect of phosphate is as follow: sodium metaphosphate>sodium tripolyphosphate>sodium pyrophosphate. La_2O_3 not only hinders the γ-Fe_2O_3 particles sintering, but also suppresses the phase transformation. This is due to La^3^+ ions packing in the intervals of γ-Fe_2O_3 lattice and the chemical action of La_2O_3 and γ-Fe_2O_3 interface.
基金
国家自然科学基金
关键词
磷酸盐
分散性
磁性
包敷剂
铁黄
ultrafine geothite
coating
phosphate
La_2O_3
dispersion
thermal stability
magnetism
