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The positron annihilation lifetime spectroscopy(PALS), coincidence doppler broadening spectroscopy(CDBS) and x-ray diffraction(XRD) are measured in the Fe3O4 . The aim is to ascertain how pressure and annealing temperature influence the properties of Fe3O4 nanoparticles, such as the change of phase, electronic structure, defect and distribution of electronic momenta. The results indicate that the defect concentration of Fe3O4 nanoparticles increases with the increase of pressure, but the phase and defect type do not change. The phase type, and the guantity and type of defect change significantly as the annealing temperature varies. The phase transition of the Fe3O4 wafer pressed in atmosphere occurs when the annealing temperature is between 350 ℃ and 500 ℃. The grain size of Fe3O4 increases with the increase of the annealing temperature, which leads to the decrease in boundary defect and parameter S but it is contrary to the ratio curve.
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Keywords:
- positron /
- Fe3O4 /
- lifetime spectroscopy /
- Doppler broadening spectrum
[1] Schultz P J, Lynn K G 1988 Rev. Mod. Phys. 60 701
[2] Siegel R W 1980 Ann. Rev. Mater. Sci. 10 393
[3] Puska M J, Nieminen R M 1994 Rev. Mod. Phys. 66 841
[4] Lynn K G, Goland A N 1976 Solid State Commun. 18 1549
[5] Poddar P, Telem-Shafir T, Fried T, Markovich G 2002 Phys. Rev. B 66 060403
[6] Kang Y S, Risbud S, Rabolt J F, Stroeve P 1996 Chem. Mater. 8 209
[7] Xie J, Chen K, Huang J, Lee S, Wang J H, Gao J H, Li X G, Chen X Y 2010 Biomaterials 31 3016
[8] Zhang D H, Liu Z Q, Han S, Li C, Lei B, Stewart M P, Tour J M, Zhou C W 2004 Nano Lett. 4 2151
[9] Schaefer H E, Würschum R 1987 Phys. Lett. A 119 370
[10] Schaefer H E, Würschum R, Birringer R, Gleiter H 1988 Phys. Rev. B 38 9545
[11] Xu J, Mills A P Jr, Ueda A, Henderson D O, Suzuki R, Ishibashi S 1999 Phys. Rev.Lett. 83 4586
[12] Patterson A L 1939 Phys. Rev. 56 978
[13] Deng J G, Ding X B, Zhang W C, Peng Y X, Wang J H, Long X P, Li P, Chan Albert S C 2002 Polymers 43 2182
[14] Cao X Z, Song T Y, Wang X Q 1994 Inorganic Chemistry 3rd Ed. (Beijing: Higher Education Press) p1019(in Chinese)[曹锡章、 宋天佑、 王杏乔 1994 无机化学(第3版) (北京: 高等教育出版社) 第1019页]
[15] Xi C Y 2005 Ph. D. Dissertation (Hefei: University of Science and Technology of China) (in Chinese) [郗传英 2005 博士学位论文 (合肥: 中国科学技术大学)]
[16] Ghosh V J, Alatalo M, Asoka-Kumar P, Nielsen B, Lynn K G, Kruseman A C, Mijnarends P E 2000 Phys. Rev. B 61 10095
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[1] Schultz P J, Lynn K G 1988 Rev. Mod. Phys. 60 701
[2] Siegel R W 1980 Ann. Rev. Mater. Sci. 10 393
[3] Puska M J, Nieminen R M 1994 Rev. Mod. Phys. 66 841
[4] Lynn K G, Goland A N 1976 Solid State Commun. 18 1549
[5] Poddar P, Telem-Shafir T, Fried T, Markovich G 2002 Phys. Rev. B 66 060403
[6] Kang Y S, Risbud S, Rabolt J F, Stroeve P 1996 Chem. Mater. 8 209
[7] Xie J, Chen K, Huang J, Lee S, Wang J H, Gao J H, Li X G, Chen X Y 2010 Biomaterials 31 3016
[8] Zhang D H, Liu Z Q, Han S, Li C, Lei B, Stewart M P, Tour J M, Zhou C W 2004 Nano Lett. 4 2151
[9] Schaefer H E, Würschum R 1987 Phys. Lett. A 119 370
[10] Schaefer H E, Würschum R, Birringer R, Gleiter H 1988 Phys. Rev. B 38 9545
[11] Xu J, Mills A P Jr, Ueda A, Henderson D O, Suzuki R, Ishibashi S 1999 Phys. Rev.Lett. 83 4586
[12] Patterson A L 1939 Phys. Rev. 56 978
[13] Deng J G, Ding X B, Zhang W C, Peng Y X, Wang J H, Long X P, Li P, Chan Albert S C 2002 Polymers 43 2182
[14] Cao X Z, Song T Y, Wang X Q 1994 Inorganic Chemistry 3rd Ed. (Beijing: Higher Education Press) p1019(in Chinese)[曹锡章、 宋天佑、 王杏乔 1994 无机化学(第3版) (北京: 高等教育出版社) 第1019页]
[15] Xi C Y 2005 Ph. D. Dissertation (Hefei: University of Science and Technology of China) (in Chinese) [郗传英 2005 博士学位论文 (合肥: 中国科学技术大学)]
[16] Ghosh V J, Alatalo M, Asoka-Kumar P, Nielsen B, Lynn K G, Kruseman A C, Mijnarends P E 2000 Phys. Rev. B 61 10095
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