Study of the phase composition of Fe2O3 and Fe2O3/TiO2 nanoparticles using X-ray diffraction and Debye formula

被引：9

作者：

Vales, Vaclav ^{[1
]}

Poltierova-Vejpravova, Jana ^{[1
]}

Holy, Vaclav ^{[1
]}

Tyrpekl, Vaclav ^{[2
]}

Brazda, Petr ^{[3
]}

Doyle, Stephen ^{[4
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, Dept Condensed Matter Phys, Ke Karlovu 5, CR-12116 Prague, Czech Republic

[2] Inst Inorgan Chem AS CR vvi, Rez 25068, Czech Republic

[3] Charles Univ Prague, Fac Sci, Dept Inorgan Chem, Prague 12840, Czech Republic

[4] ANKA, Forschungszentrum Karlsruhe GmBH, D-76344 Eggenstein Leopoldshafen, Germany

来源：

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 7 NO 5 | 2010年 / 7卷 / 05期

关键词：

Fe2O3/TiO2; nanocomposites; structure; phase transition; annealing; EPSILON-FE2O3; NANOCRYSTALS; COERCIVE FIELD;

D O I：

10.1002/pssc.200983385

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Phase changes in Fe2O3 and Fe2O3/TiO2 nanoparticles were studied by X-ray diffraction. Because of a very small size of the particles, standard methods of data analysis based on the physical broadening of lines and instrumental function fail and calculations based on the Debye formula were used instead. The measured data from both types of particles were analyzed assuming a core-shell model of the phase composition of the particles and the dependence of the particle size and phase composition on the annealing temperature was determined. In both types of nanoparticles a phase transition was observed and the amount of a new phase increases with the annealing temperature. (c) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：1399 / 1404

页数：6

共 10 条

[1] Novel sol-gel method for preparation of high concentration ε-Fe2O3/SiO2 nanocomposite
Brazda, Petr
Niznansky, Daniel
Rehspringer, Jean-Luc
Vejpravova, Jana Poltierova
[J]. JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 2009, 51 (01) : 78 - 83
[2] ELECTROCHEMICAL PHOTOLYSIS OF WATER AT A SEMICONDUCTOR ELECTRODE
FUJISHIMA, A
HONDA, K
[J]. NATURE, 1972, 238 (5358) : 37 - +
[3] FUJISHIMA A, 1989, TIO2 PHOTOCATALYSIS
[4] High- and low-temperature crystal and magnetic structures of ε-Fe2O3 and their correlation to its magnetic properties
Gich, M.
Frontera, C.
Roig, A.
Taboada, E.
Molins, E.
Rechenberg, H. R.
Ardisson, J. D.
Macedo, W. A. A.
Ritter, C.
Hardy, V.
Sort, J.
Skumryev, V.
Nogues, J.
[J]. CHEMISTRY OF MATERIALS, 2006, 18 (16) : 3889 - 3897
[5] Formation of spherical and rod-shaped ε-Fe2O3 nanocrystals with a large coercive field
Jin, J
Hashimoto, K
Ohkoshi, S
[J]. JOURNAL OF MATERIALS CHEMISTRY, 2005, 15 (10) : 1067 - 1071
[6] Formation of nanoparticles of ε-Fe2O3 from yttrium iron garnet in a silica matrix:: An unusually hard magnet with a morin-like transition below 150 K
Kurmoo, M
Rehspringer, JL
Hutlova, A
D'Orléans, C
Vilminot, S
Estournès, C
Niznansky, D
[J]. CHEMISTRY OF MATERIALS, 2005, 17 (05) : 1106 - 1114
[7] The addition effects of alkaline earth ions in the chemical synthesis of ε-Fe2O3 nanocrystals that exhibit a huge coercive field -: art. no. 10K312
Ohkoshi, S
Sakurai, S
Jin, J
Hashimoto, K
[J]. JOURNAL OF APPLIED PHYSICS, 2005, 97 (10)
[8] Structural and magnetic characterization of ε-Fe2O3
Tronc, E
Chaneac, C
Jolivet, JP
[J]. JOURNAL OF SOLID STATE CHEMISTRY, 1998, 139 (01) : 93 - 104
[9] Nonzero orbital moment in high coercivity ε-Fe2O3 and low-temperature collapse of the magnetocrystalline anisotropy
Tseng, Yuan-Chieh
Souza-Neto, Narcizo M.
Haskel, Daniel
Gich, Marti
Frontera, Carlos
Roig, Anna
van Veenendaal, Michel
Nogues, Josep
[J]. PHYSICAL REVIEW B, 2009, 79 (09):
[10] Warren E., 1969, XRAY DIFFRACTION

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