Praseodymium alloy ion source for focused ion beam implantation in superconductors

Machalett, F.; Seidel, P.; Mühle, R.

doi:10.1063/1.1146801

Cited by 9 publications

(3 citation statements)

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“…The high percentage of doubly charged and the presence of triply charged dysprosium ions is typical for LAIS utilizing alloys with rare earth elements. This behaviour was already found for Co-Nd (Hesse et al 1994), Au-Si-Pr (Machalett et al 1996), Au-Er-Si (Machalett et al 1998), Er-Ni (Chao and Steckl (1999), Co-Y (Mühle et al 1998), Au-Dy-Ge and Au-Dy-Si (Mühle et al 2002) and Dy-Ni (Melnikov et al 2002). Brown and Godechot (1991) also found three charge states 1 + , 2 + and 3 + for dysprosium ions in the plasma formed during the arc discharge in a metal vapour vacuum arc (MEVVA) ion source with corresponding particle flux fractions of 2%, 66% and 32%, respectively.…”

Section: Mass Spectrasupporting

confidence: 77%

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Investigations on a Co–Dy liquid alloy ion source

Mühle¹,

Döbeli²,

Melnikov³

2007

J. Phys. D: Appl. Phys.

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We have investigated the emission characteristics of a Co–Dy liquid alloy ion source intended for focused ion beam implantation of cobalt and dysprosium ions. An alloy composition of Co2Dy was selected in order to have a relatively low melting temperature, sufficient cobalt concentration for ion implantation purposes and low corrosion effects of the alloy and emitter tungsten wires. We have measured the melting behaviour of the alloy, the emission current stability, the current–voltage characteristics and the mass and energy spectra as a function of source current using a time-of-flight spectrometer. The ion source exhibits a good performance even after storage for several weeks in dry air. The mass spectra show a high intensity of doubly charged dysprosium ions and singly and doubly charged cobalt ions. The Co–Dy source works in a stable way for at least several days.

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Section: Mass Spectrasupporting

confidence: 77%

“…reactivity of neodymium with oxygen resulting in unstable emission behaviour. In preceding publications we reported on LAIS investigations of Au-Co (Mühle et al 1996) and Co-Y (Mühle et al 1998). For the Au-Co LAIS we used the eutectic composition Au 75.2 Co 24.8 (at.%) with a liquidus temperature of 996.5 • C (Massalski 1990).…”

Section: Introductionmentioning

confidence: 99%

Investigations on a Co–Dy liquid alloy ion source

Mühle¹,

Döbeli²,

Melnikov³

2007

J. Phys. D: Appl. Phys.

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“…It is also used as a coloring agent in glasses and enamels to produces an intense clean yellow color [1]. Praseodymium-germanium (silicon) alloys are used as superconductor [2]. Now a day, number of methods has been reported for the determination of praseodymium in real sample analysis, such as, absorption spectra of 4d electron transitions, derivative spectroscopy, and some other spectroscopic method.…”

Section: Introductionmentioning

confidence: 99%

Comparative studies of praseodymium(III) selective sensors based on newly synthesized Schiff's bases

Gupta

Goyal

Pal

et al. 2009

Analytica Chimica Acta

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a b s t r a c tPraseodymium ion selective polyvinyl chloride (PVC) membrane sensors, based on two new Schiff's bases 1,3-diphenylpropane-1,3-diylidenebis(azan-1-ylidene)diphenol (M 1 ) and N,Nbis(pyridoxylideneiminato) ethylene (M 2 ) have been developed and studied. The sensor having membrane composition of PVC: o-NPOE: ionophore (M 1 ): NaTPB (w/w; mg) of 150: 300: 8: 5 showed best performances in comparison to M 2 based membranes. The sensor based on (M 1 ) exhibits the working concentration range 1.0 × 10 −8 to 1.0 × 10 −2 M with a detection limit of 5.0 × 10 −9 M and a Nernstian slope 20.0 ± 0.3 mV decade −1 of activity. It exhibited a quick response time as <8 s and its potential responses were pH independent across the range of 3.5-8.5.The influence of the membrane composition and possible interfering ions have also been investigated on the response properties of the electrode. The sensor has been found to work satisfactorily in partially non-aqueous media up to 15% (v/v) content of methanol, ethanol or acetonitrile and could be used for a period of 3 months. The selectivity coefficients determined by using fixed interference method (FIM) indicate high selectivity for praseodymium(III) ions over wide variety of other cations. To asses its analytical applicability the prepared sensor was successfully applied for determination of praseodymium(III) in spiked water samples.

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Focused Ion Beams and Some Selected Applications

Machalett

Seidel

2019

Digital Encyclopedia of Applied Physics

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Focused ion beams (FIBs) have been widely used for micro‐ and nanofabrication, failure analysis, and preparation of research prototypes. This article gives the reader a first and short introduction to the field of FIBs with some basics of FIB generation and an impression of a variety of main established applications as well as select new directions. We describe the design and the principles of functionality of common and new versions of FIB systems generated with different types of ion sources. For more details and further studies, some references to excellent review articles and books are given, which contain further references. An FIB system consists of a source emitting ions from a very small region, an ion optical system for focusing a spot down to a few nm and a scan unit for controlled movement of the focused beam in lateral directions. The ion beam interaction with the target material modifies its surface properties or surface structure by processes such as ion implantation, ion milling, ion‐beam induced etching, and deposition. The FIB offers the opportunity to generate structures in nanometer dimension with a high accuracy by maskless, direct writing with the focused beam. In this article, we give an overview of selected applications. The FIB alone, and moreover combined with a scanning electron microscope (SEM) in one vacuum chamber, implemented with several different detectors, opens many fields of applications, such as imaging, analytics, tomography, preparation and fabrication of samples and tools.

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Praseodymium alloy ion source for focused ion beam implantation in superconductors

Abstract: Articles you may be interested inAlloy liquid metal ion source for carbon focused ion beams Rare earth focused ion beam implantation utilizing Er and Pr liquid alloy ion sourcesInvestigations on liquid alloy ion sources for rare-earth elements (abstract) Rev. Sci.

Cited by 9 publications

References 9 publications

Investigations on a Co–Dy liquid alloy ion source

Investigations on a Co–Dy liquid alloy ion source

Comparative studies of praseodymium(III) selective sensors based on newly synthesized Schiff's bases

Focused Ion Beams and Some Selected Applications

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