Inveedgation of nanocrystalline material Fe<sub>2</sub>O<sub>3</sub> by X ray diffraction and poaitron annihilation

Peng Yuqing

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Inveedgation of nanocrystalline material Fe₂O₃ by X ray diffraction and poaitron annihilation

更新时间：2021-04-09

- Inveedgation of nanocrystalline material Fe₂O₃ by X ray diffraction and poaitron annihilation
- NUCLEAR TECHNIQUES Issue 9, (1995)
- 作者机构：
  
  1. 中国科学院上海原子核研究所
  2. 上海师范大学
  3. 中国科学院上海原子核研究所上海师范大学
- 作者简介：
- 基金信息：
- DOI：
  CLC： TB383
- Published：01 September 1995
- 稿件说明：
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[1]彭郁卿,周诗瑶.纳米材料Fe_2O_3的X射线衍射与正电子湮没研究[J].核技术,1995(09):530-534.

Peng Yuqing. Inveedgation of nanocrystalline material Fe₂O₃ by X ray diffraction and poaitron annihilation[J]. Nuclear techniques, 1995, (9).
[1]彭郁卿,周诗瑶.纳米材料Fe_2O_3的X射线衍射与正电子湮没研究[J].核技术,1995(09):530-534. DOI：

Peng Yuqing. Inveedgation of nanocrystalline material Fe₂O₃ by X ray diffraction and poaitron annihilation[J]. Nuclear techniques, 1995, (9). DOI：

摘要

给出了纳米材料Ｆｅ２Ｏ３的Ｘ射线衍射与正电子湮没辐射多普勒展宽的实验结果．发现样品分别经４００℃４ｈ与８００℃４ｈ退火后，原来的γ－Ｆｅ２Ｏ３均转变成α－Ｆｅ２Ｏ３，而且颗粒尺寸分别增加到３８．７ｎｍ与９２．９ｎｍ；样品的线形参数均随退火温度升高而减小；当Ｄ～Ｌ＋时，自由正电子湮没显著增加；压制压力较大的样品的缺陷浓度略有增加。

Abstract

The experimental results of X ray diffraction and Doppler broadening of positron annihilation radiation for nanocrystalline material Fe2O3 are presented. It is shown that when samples are annealed at 400°C for 4h and 800°C for 4h

the initial γ -Fe2O3 transforms into the α-Fe2O3

and grain diameters increase to 38.7nm and 92.9nm respectively. The line parameters of the specimen decrease with the annealing temperature. When D～L+

the fraction of free positron annihilation increases obviously. The defect concentration increases slightly for samples compacted with a higher pressure.

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Inveedgation of nanocrystalline material Fe2O3 by X ray diffraction and poaitron annihilation

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摘要

Abstract

关键词

Keywords

references

Inveedgation of nanocrystalline material Fe₂O₃ by X ray diffraction and poaitron annihilation