摘要
发现纳米γ－Fe2O3磁粉的DTA曲线上出现了一个不能重现的放热峰．X射线衍秀才射（XRD）分析证实此放热峰对应于从γ—Fe2O3向α－Fe2O3的结构相变．主要是结构相变和晶粒长大引起的．对比实验的结果表明，纳米γ－Fe2O3磁粉的结构相变温度明显高于普通的γ－Fe2O3磁粉．
By DTA (Differential Thermal Analysis) experiments on magnetic powder of nanostuctured γ-Fe2O3, an exothermal peak which is not repeatable on DTA curve was found. By XRD (X-Ray Difraction) experiments on original sample and its heat-treating samplcs, it was proved that the exothermal peak is related to the structural phase transition from nanostructured γ-Fe2O3 to α-Fe2O3 and the growth of nanoparticles will benefit from this transition. The comparative experiment shows that the structural tran-sition temperature of nanostructured γ-Fe2O3 is obviously higher than that of conventional γ-Fe2O3.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
1997年第3期302-304,共3页
Chinese Journal of Materials Research
基金
国家自然科学基金!59472020
关键词
纳米
Fe2O3磁粉
差热分析
结构相变
热稳定性
magnetic powder of nanostructured γ-Fe_2O_3 differential thermal analysis (TG-DTA)structural phase transition
