Electron Spin Resonance of Fe 3+ Ions in ZnO Single Crystal

Matsuki, Kiyoshi; Kimura, Jun; Sakagami, Noboru; Satoh, Hiroyasu; Onodera, Akira

doi:10.1080/00150190211565

Ferroelectrics

2002

DOI: 10.1080/00150190211565

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Electron Spin Resonance of Fe 3+ Ions in ZnO Single Crystal

Kiyoshi Matsuki

Jun Kimura

Noboru Sakagami

et al.

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“…[14,19,25,44]. The EPR lines are designated a, b, c, d and e in figure 2, where c indicates the central transition (+1/2 ⇔ -1/2) and a, b, d and e indicate peripheral ones (-5/2 ⇔ -3/2, -3/2 ⇔ -1/2, +1/2 ⇔ +3/2, +3/2 ⇔ +5/2).…”

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confidence: 99%

Local coordination of Fe³⁺in ZnO nanoparticles: multi-frequency electron paramagnetic resonance (EPR) and Newman superposition model analysis

Açıkgöz

Drahus

Ozarowski

et al. 2014

J. Phys.: Condens. Matter

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Iron-doped ZnO nanoparticles have been synthesized through high-energy ball milling of powders produced by the co-precipitation method. Fine particles with an average size down to 40 nm have been obtained after 15 min of milling. Fe(3+) cations have been incorporated into the ZnO lattice within the limits of the solubility. By using multi-frequency and high-field electron paramagnetic resonance (EPR) we have resolved all electronic transitions for the S = 5/2 high-spin system and have accurately determined the EPR spin-Hamiltonian parameters. By combining data from crystallographic x-ray diffraction and EPR with the semi-empirical Newman superposition model we have found the local configurational position of Fe(3+) and have confirmed the symmetry of the lattice. Results presented in this paper indicate that Fe cations most probably substitute at Zn-sites in ZnO. At nanosizes the effect of Fe(3+) cations on the surface becomes remarkable: additional size effects can be observed in the EPR spectrum, which are different from the spectrum of bulk.

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confidence: 99%

Local coordination of Fe³⁺in ZnO nanoparticles: multi-frequency electron paramagnetic resonance (EPR) and Newman superposition model analysis

Açıkgöz

Drahus

Ozarowski

et al. 2014

J. Phys.: Condens. Matter

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“…The thermal treatment of ZnO crystal results in the formation of associates between metal impurities [12,13]. Fe impurity concentration in hydrothermally grown ZnO were measured by secondary ion emission and EPR methods [14,15]. During the ZnO crystal growth the…”

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confidence: 99%

Atomic absorption photometry of excess Zn in ZnO

Lott

Shinkarenko

Kirsanova

et al. 2005

phys. stat. sol. (c)

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PACS 61.50. Nw, 61.72.Ji, 64.70.Hz Zn excess in ZnO is built up automatically at high temperatures. Excess Zn in hydrothermally grown ZnO single crystals were investigated by the atomic absorption photometry (AAP) method. To determine the excess zinc in ZnO samples, the AAP of zinc vapour was used in the conditions of solid-vapour equilibrium. Zn AAP allowes to eliminate excess Zn connected differentially in ZnO samples. To fix Zn non-stoichiometry, all the ZnO samples tested were previously heat treated at temperature interval from 850 to 900 0 C and at fixed Zn vapour pressures from 0.1 to 0.9 of saturated zinc vapour pressure at given treatment temperature. The analysis of temperature dependence of zinc vapour pressure indicated that the impurity metals take active role in the determination of non-stoichiometric zinc. The impurities Mn, Fe, Co, Ni and Cu form oxides which will reduce during annealing in Zn vapor up to metals form. During AAP measurement in optical cuvette, these metals react with ZnO and give additional Zn vapor pressure.1 Overview ZnO is used in a wide range of scientific and technological applications, such as optoelectronic devices, varistors, devices for surface acoustic waves and planar optical waveguides, transparent electrodes and transparent windows for a solar cell, gas sensors, flat panel diplays, catalysts, ferroelectric memories and spintronic devices, antibacterial agent and ZnO can satisfy the commercial desire for blue and ultraviolet light emitting devices -it is suitable to grow the high quality ZnO homoepilayer on the ZnO substrate [1][2][3]. For that reason, it is important to produce high quality ZnO bulk crystals for substrates of ZnO-related devices. The hydrothermal method has an advantage to grow large bulk crystals due to the growth under low supersaturation [4][5][6]. Some doubts were raised about the quality of such crystals because they have often exhibited large X-ray rocking curve widths and low photoluminescence yield with large linewidths [7]. But if the surface damage due to mechanical polishing was overcome, hydrothermal ZnO crystals provided a competitive substrate for homoepitaxial growth [7,8]. As the hydrothermal crystals invitably involve alkali metals from solution and small amounts of metallic impurities then one of the problems in hydrothermally grown ZnO crystals is the contamination of the crystal with metallic impurities. The concentration of impurities exceeds often the concentration of intrinsic defects. The colourless crystals were found with a total impurity content of less than 1 ppm [4,9] but it is found that the green colouration of the hyrothermally grown crystals may be due to the presence of iron in concentration up to 60 ppm [9]. The solubilities of metal oxides in ZnO are high. For example the solubility of Fe in ZnO is 7 mole% at 800 0 C [10]. Fe in ZnO appears as a result of the corrosion of the inner wall of the autoclave [11]. The thermal treatment of ZnO crystal results in the formation of associates between metal impurities [12,...

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An X- and Q-band Fe3+ EPR study of nanoparticles of magnetic semiconductor Zn1−Fe O

Misra

Andronenko

Thurber

et al. 2014

Journal of Magnetism and Magnetic Materials

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Electron Spin Resonance of Fe 3+ Ions in ZnO Single Crystal

Cited by 3 publications

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Local coordination of Fe³⁺in ZnO nanoparticles: multi-frequency electron paramagnetic resonance (EPR) and Newman superposition model analysis

Local coordination of Fe³⁺in ZnO nanoparticles: multi-frequency electron paramagnetic resonance (EPR) and Newman superposition model analysis

Atomic absorption photometry of excess Zn in ZnO

An X- and Q-band Fe3+ EPR study of nanoparticles of magnetic semiconductor Zn1−Fe O

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Electron Spin Resonance of Fe 3+ Ions in ZnO Single Crystal

Cited by 3 publications

References 0 publications

Local coordination of Fe3+in ZnO nanoparticles: multi-frequency electron paramagnetic resonance (EPR) and Newman superposition model analysis

Local coordination of Fe3+in ZnO nanoparticles: multi-frequency electron paramagnetic resonance (EPR) and Newman superposition model analysis

Atomic absorption photometry of excess Zn in ZnO

An X- and Q-band Fe3+ EPR study of nanoparticles of magnetic semiconductor Zn1−Fe O

Contact Info

Product

Resources

About

Local coordination of Fe³⁺in ZnO nanoparticles: multi-frequency electron paramagnetic resonance (EPR) and Newman superposition model analysis

Local coordination of Fe³⁺in ZnO nanoparticles: multi-frequency electron paramagnetic resonance (EPR) and Newman superposition model analysis