Magnetic and structural properties of nanophase AgxFe1 − x solid solution particles

Lin, Hong Ming; Tung, Chiun-Yen; Yao, Y. D.; Hwu, Y.; Tsai, Wen Li; Tzeng, Shah Jye; Lin, Chung Kwei; Lee, Pee Yew

doi:10.1016/s0965-9773(98)00086-5

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…For example, it provides both good electrical conductivity (Nakahara et al 2001) and high transmittance. ZnO has great applicability in the preparation of solar cells (Wang et al 2001), gas sensors (Lin et al 1998;Xu et al 2000), transparent electrodes (Sahu et al 2007), piezoelectric materials (Wang and Song 2006), and varistors (Koch et al 1995). However, these are simply a few examples that illustrate its importance.…”

Section: Introductionmentioning

confidence: 99%

Change in the morphology of ZnO nanoparticles upon changing the reactant concentration

2012

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ZnO plays an important role in many technological aspects of semiconductors. Because of its interesting properties, it has attracted a great deal of attention for a wide range of applications. In this work, the direct precipitation method was employed for the synthesis of ZnO nanoparticles to study the role of different concentration ratios of reactants on the crystal structure, size, and morphology of the prepared ZnO nanoparticles. The reactant raw materials used in this experiment were zinc acetate dihydrate as a zinc source and NaOH. ZnO nanoparticles were synthesized by calcination of the ZnO precursor precipitates at 250°C for 3 h. These calcinated ZnO nanoparticles and their properties were characterized using X-ray diffraction, a scanning electron microscope equipped with an energy dispersive X-ray spectrometer, and transmission electron microscopy. We present the experiment conditions, including result on the different reactant concentration ratios, which affect the control of the size and morphology of the ZnO nanoparticles. The mean size of the ZnO nanoparticles was 18 nm.

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Section: Introductionmentioning

confidence: 99%

Change in the morphology of ZnO nanoparticles upon changing the reactant concentration

2012

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“…The phase diagram of Fe–Ag binary alloys exhibits complete immiscibility even in the liquid phase at ∼1800 K, indicating a strong repulsive interaction between the two metals . This binary system has been synthesized by various methods, such as laser processing, − evaporation, − sputtering, − ion-beam deposition, − mechanical alloying, − electroless deposition, − and electrodeposition. − The latter technique however is especially suitable for tailoring the micro/nanostructure down to few nanometers, mainly due to the low energy and limited mean free path of metal ions in comparison with the physical methods. Electrodeposition of such films indeed results in separated nanophases, with the magnetic precipitates yielding giant magnetoresistance. ,,− Recently, Ag–Fe alloys have also been used as antimicrobial surfaces for biodegradable stents or antibacterial activity. , …”

Section: Introductionmentioning

confidence: 99%

Rational Compositional Control of Electrodeposited Ag–Fe films

Sun

Zangari

2020

Inorg. Chem.

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Some alloys are very difficult to electrodeposit, due to problems such as the large difference in the equilibrium potentials and/or deposition kinetics of the alloy components, as well as the bath instability due to the spontaneous reactions in the bulk electrolyte. The Ag–Fe system is one of those. In this work, a novel alkaline citrate–dimethylhydantoin (DMH) complex has been used to synthesize thermodynamically immiscible Ag–Fe alloy films. The large difference in standard potentials and deposition kinetics of Ag and Fe is partially resolved by complexing Ag(I) with DMH, while the instability caused from spontaneous reduction of Ag(I) by Fe(II) was partially resolved by adding 1% Fe3+, based on the philosophy of the mixed potential theory. Furthermore, a paradigm for control of film composition is developed, based on the mass-transfer coefficient ratio, tested with various bath constitutions. Uniform and high-quality films are obtained, with a composition error of <4 at. % comparing with the predicted values. Electrochemical reactions involved in the deposition baths were systematically investigated using cyclic voltammetry, showing satisfactory agreement with the predicted deposition potentials calculated by equilibrium thermodynamics. The films deposited at high overpotential are proven to be biphasic, containing Ag-fcc and Fe-bcc phases, with a trend of decreasing crystallinity at increasing overpotentials when deposited at constant deposition time. A narrow transition potential range (<0.05 V) from the onset of Fe deposition to its limiting current condition was observed.

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“…Ag is an example of such a metal. However, in recent years, it has been shown that metastable and homogeneous alloys of Fe-Ag system can be formed by using special techniques, such as thermal evaporation 13,14 , liquid quenching 15 , ion implantation 16 , sputtering [17][18][19][20][21] , mechanical alloying [22][23][24] , gas condensation 25 and a sol-gel process [26][27][28] . FeAg granular alloy, however, is metastable, and upon recrystallization at elevated temperatures, a transformation into separated phases of BCC Fe and FCC Ag occurs.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature

et al. 2005

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Fe10Ag90 granular alloys have been prepared using a sol-gel process, sintered at 300 °C and annealed at temperatures between 400 °C and 700 °C. The mean size of the iron particles, obtained from X-ray diffraction, is 30.0 ± 0.7 nm. Due to the existence of a distribution of particle sizes in these samples, both blocked (BL) and superparamagnetic (SPM) particles are present simultaneously, as confirmed by magnetization measurements at room temperature. AC susceptibility measurements as a function of temperature reveal a magnetic phase transition at about 770 °C, indicating the presence of particles exhibiting bulk behavior, in the samples annealed above 550 °C. The presence of these particles has been attributed to an atomic diffusion process between the grains, forming bulk-like multiple-domain Fe particles having Curie temperatures near that of bulk alpha-Fe phase (T C = 770 °C)

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Magnetic and structural properties of nanophase AgxFe1 − x solid solution particles

Cited by 10 publications

References 12 publications

Change in the morphology of ZnO nanoparticles upon changing the reactant concentration

Change in the morphology of ZnO nanoparticles upon changing the reactant concentration

Rational Compositional Control of Electrodeposited Ag–Fe films

Magnetic properties of the granular alloy Fe10Ag90 as a function of annealing temperature

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