【摘要】 研究了包敷磷酸盐和稀土氧化物对α-FeOOH分散性、γ-Fe₂O₃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-Fe₂O₃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。La₂O₃可阻止γ-Fe₂O₃烧结和相变,该作册源于La³⁺在γ-Fe₂O₃晶格母体的填隙和La₂O₃与γ-Fe₂O₃间的界面化学作用。更多还原

【Abstract】 The influences of coated phosphate and rare earth metal oxide on dispersion of ultrafine geothite, thermal stability and magnetism of γ-Fe₂O₃ were studied. It was shown that the coated phosphate can obviously enhance the magnetism of γ-Fe₂O₃ and the coating effect of phosphate is as follow: sodium metaphosphate>sodium tripolyphosphate>sodium pyrophosphate. La₂O₃ not only hinders the γ-Fe₂O₃ particles sintering, but also suppresses the phase transformation. This is due to La³⁺ ions packing in the intervals of γ-Fe₂O₃ lattice and the chemical action of La₂O₃ and γ-Fe₂O₃ interface.更多还原