Effect of Zn Concentration on Microstructural, Optical, and Hyperfine Properties of Nanocrystalline α-Fe2O3

doi:10.1007/s40195-014-0093-8

Abstract

Abstract:

Efforts have been made to prepare nanocomposites of α-Fe₂O₃-ZnO by wet chemical route with varying concentrations of the precursors. The microstructural properties of the samples are investigated by powder X-ray diffractometry (PXRD) and Transmission electron microscopy. Initial concentration of Zn ions (up to 20 at%) leads to the formation of nanocomposites of α-Fe₂O₃ and ZnO. Evolution of ZnFe₂O₄ phase is detected by the substitution of higher concentration of Zn²⁺ (30 at%) in the sample. The average size of the nanoparticles remains in the range of 22–27 nm as obtained from XRD data. The results obtained from electron microscopic studies are also close to these values. Photoluminescence measurement shows the excitonic peak of ZnO around 390 nm which gets strengthened with Zn addition. FTIR spectra show the metal–oxygen band below 700 cm^-1. Room temperature M?ssbauer studies of the samples show the transition of iron oxide form antiferromagnetic state to paramagnetic state with increasing concentration of Zn²⁺. Sharp quenching of hyperfine field with Zn concentration is observed as the H_int value reduced to zero from 51 T.

Key words: Iron oxide, ZnO, Electron microscopy, M?ssbauer study

N. R. Panda, D. Sahu, B. S. Acharya, P. Nayak, S. P. Pati, D. Das. Effect of Zn Concentration on Microstructural, Optical, and Hyperfine Properties of Nanocrystalline α-Fe₂O₃[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(4): 563-568.

Figures/Tables 6

Fig. 1 X-ray diffraction patterns of ZnO, α-Fe2O3, and α-Fe2O3-ZnO nanoparticles

Fig. 2 TEM images of the samples FZ1 a, FZ3 b

Fig. 3 M?ssbauer spectra of FZ0 a, FZ1 b, FZ2 c, FZ3 d nanoparticles

Table 1 Hyperfine parameters of α-Fe2O3 and α-Fe2O3-ZnO nanoparticles

Sample name	I.S. (mm s^-1)	Q.S. (mm s^-1)	H_int (T)
FZ0	0.43	0.42	51.7
FZ1	0.55(S) 0.20(D)	0.08(S) 0.36(D)	51.6
FZ2	0.53(S) 0.23(D)	0.06(S) 0.36(D)	50.05
FZ3	0.21	0.36	0

Fig. 4 FTIR spectra of FZ1, FZ2, and FZ3 nanoparticles

Fig. 5 PL spectra of FZ1, FZ2, and FZ3 nanoparticles

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Effect of Zn Concentration on Microstructural, Optical, and Hyperfine Properties of Nanocrystalline α-Fe₂O₃

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