The X-Ray Diffraction Studies of -Fe2O3 Ultrafine Particles Treated by High Pressure
-
摘要: 采用沉淀法制备了-Fe2O3超微粒,将超微粒粉末在不同温度下进行了高压处理,利用X射线衍射,TEM和穆斯堡尔谱学对高压处理前后的样品进行了研究。结果表明,室温下压力对微晶的晶粒尺寸没有产生明显的影响,热压使晶粒尺寸有较大增长。压力主要对微晶的晶格畸变程度及取向产生了影响。Abstract: -Fe2O3 ultrafine particles were prepared with precipitation method and treated by high pressure at various temperatures. The samples were studied by X-ray, TEM and Mossbauer spectroscopy. The results indicate that the high pressure has no obvious influence on the size of microcrystals at room temperature, but the grain size of microcrystals increase greatly at the condition of 4.0 GPa and 400 ℃. Also, the high pressure mainly influences the orientation and lattice distortion of microcrystals.
-
Key words:
- ultrafine particles /
- high pressure /
- lattice distortion /
- orientation
-
Brus L E, Siegel R W, Andres R P, et al. J Mater Res, 1989, 4(3): 704. Hayashi C. Physics Today, 1987, 40(12): 44. Gleiter H. Prog Mater Sci, 1989, 33: 223. Kato A, Suyama Y. Jpn J Surf Sci Soc, 1987, 8(5): 316. 王煜明. 非晶体及晶体缺陷的X射线衍射. 北京: 科学出版社, 1988: 142. Kundig W, Bommel H, Constabaris G, et al. Phys Rev, 1966, 142(2): 327.
点击查看大图
计量
- 文章访问数: 7053
- HTML全文浏览量: 424
- PDF下载量: 744