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Your search keyword '"Lubomirsky, I."' showing total 176 results
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176 results on '"Lubomirsky, I."'

7. Using chlorine gas to recover rare earth metals from end-of-life permanent magnets.

Author

Kaplan V., Feldman Y., Gartsman K., Lubomirsky I., Park Kyoung-Tae, Wachtel E., Kaplan V., Feldman Y., Gartsman K., Lubomirsky I., Park Kyoung-Tae, and Wachtel E.

Abstract

A laboratory-scale process is described for recycling rare earth metals from end-of-life rare-earth/iron/boron alloy permanent magnets using a 2 h chlorine gas treatment at 673 K. This treatment does not require any special preparation of the magnets; they can be used without demagnetisation, crushing or milling. Following treatment at 673 K, a clinker powder consisting of rare earth metal chlorides with minimal amounts of other metals is obtained, while haematite and iron oxychloride sublimate. Following literature sources, it is suggested that the rare earth metal chlorides in the clinker may be readily reduced to metal, either by electrolysis in relatively low temperature eutectic melts or by metallothermic reduction in mixtures with alkali or alkaline earth metals. (Authors.), A laboratory-scale process is described for recycling rare earth metals from end-of-life rare-earth/iron/boron alloy permanent magnets using a 2 h chlorine gas treatment at 673 K. This treatment does not require any special preparation of the magnets; they can be used without demagnetisation, crushing or milling. Following treatment at 673 K, a clinker powder consisting of rare earth metal chlorides with minimal amounts of other metals is obtained, while haematite and iron oxychloride sublimate. Following literature sources, it is suggested that the rare earth metal chlorides in the clinker may be readily reduced to metal, either by electrolysis in relatively low temperature eutectic melts or by metallothermic reduction in mixtures with alkali or alkaline earth metals. (Authors.)

Published
2021

11. Surface piezoelectricity and pyroelectricity in centrosymmetric materials: A case of α-glycine

Author

Dishon, S., Ushakov, A., Nuraeva, A., Ehre, D., Lahav, M., Shur, V., Kholkin, A., Lubomirsky, I., Dishon, S., Ushakov, A., Nuraeva, A., Ehre, D., Lahav, M., Shur, V., Kholkin, A., and Lubomirsky, I.

Abstract

Surface pyroelectricity and piezoelectricity induced by water incorporation during growth in α-glycine were investigated. Using the periodic temperature change technique, we have determined the thickness (~280 µm) of the near surface layer (NSL) and its pyroelectric coefficient (160 pC/(K × cm2) at 23◦C) independently. The thickness of NSL remains nearly constant till 60◦C and the pyroelectric effect vanishes abruptly by 70◦C. The piezoelectric effect, 0.1 pm/V at 23◦C measured with an interferometer, followed the same temperature dependence as the pyroelectric effect. Abrupt disappearance of both effects at 70◦C is irreversible and suggests that water incorporation to α-glycine forms a well defined near surface phase, which is different form α-glycine because it is polar but it too close to α-glycine to be distinguished by X-ray diffraction (XRD). The secondary pyroelectric effect was found to be <14% of the total, which is unexpectedly small for a material with a large thermal expansion coefficient. This implies that water incorporation infers minimal distortions in the host lattice. This finding suggests a path for the control of the piezoelectric and pyroelectric effects of the crystals using stereospecific incorporation of the guest molecules. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Published
2020

14. e-beam-referenced work-function evaluation in an x-ray photoelectron spectrometer.

Author

Cohen, H., Nogues, C., Zon, I., and Lubomirsky, I.

Subjects
PHOTOELECTRON spectroscopy, SPECTROMETERS, SPECTRUM analysis instruments, PHOTOELECTRONS, ELECTRONS, PARTICLES (Nuclear physics), THERMAL conductivity, THERMAL conductivity measurement
Abstract

A method for work-function evaluation is proposed, based on recording the shift of x-ray photoelectron signals from a surface irradiated by low-energy electrons. The method is capable of measuring samples with very low conductivity, poor back contacts, and high dielectric constants. The method is also applicable to magnetic materials and can be particularly effective for studies of multilayer and heterogeneous systems. [ABSTRACT FROM AUTHOR]

Published
2005
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17. Piezoelectric properties of α-glycine and DL-alanine single crystals

Author

Gubarev, T. D., Vasilev, S. G., Zelenovskiy, P. S., Lubomirsky, I., Kholkin, A. L., and Shur, V. Ya.

Abstract

We present the results of studying piezoelectric properties in pure DL-alanine and α-glycine crystals doped with amino acids: L-alanine, L-serine, and phase transformations in pure DL-alanine crystals. Crystals were provided by Weizmann Institute of Science. Piezoelectric properties have been measured with high spatial resolution by piezoresponse force microscopy (PFM) using Asylum MFP 3D (Asylum Research, USA). Phase transformation was visualized by PFM.

Published
2017

18. Piezoelectic properties of DL-alanine single crystals

Author

Gubarev, T. D., Vasilev, S. G., Zelenovskiy, P. S., Lubomirsky, I., Kholkin, A. L., and Shur, V. Ya.

Abstract

The study was carried out using the equipment of UCSU "Modern Nanotechnology" UrFU with the financial support of the Government of the Russian Federation (Act 211, contract 02.A03.21.0006).

Published
2017

19. Uncovering the origin of local electrochemical response in Ce1.9Gd0.1O2

Author

Slautin, B. N., Alikin, D. O., Ushakov, A. D., Bondarev, S. A., Mishuk, E., Lubomirsky, I., Tselev, A., Shur, V. Ya., and Kholkin, A. L.

Abstract

Cerium oxide (CeO) has a wide range of different applications such as gas sensing, water splitting and others. CeO is an attractive alternative to yttria-stabilized zirconia as an electrolyte for low-temperature fuel cells because of its high ionic conductivity, low reactivity and good chemical compatibility with many mixed conducting cathode materials [1]. The equipment of the Ural Center for Shared Use"Modern nanotechnology" UrFU was used. This research was made possible in part by RFBR (Grant No. 15-52-06006 MNTI_a). This work was supported by the Israeli Ministry of Science and Technology within the program of Israel Russian Federation Scientific Collaboration, Grant No. 12421-3. A.L.K. and A.T. acknowledge the CICECO– Aveiro Institute of Materials POCI-01-0145-FEDER-007679 (Ref. FCT UID /CTM /50011/2013), financed by national funds through the FCT/MEC and when applicable co- financed by FEDER under the PT2020 Partnership Agreement. This work has been supported in part by the Ministry of Education and Science of the Russian Federation under Project No. 3.9534.2017/BP.

Published
2017

20. Electrostriction measurements in gadolinium doped cerium oxide

Author

Ushakov, A. D., Alikin, D. O., Slautin, B. N., Mishuk, E., Lubomirsky, I., Shur, V. Ya., and Kholkin, A. L.

Abstract

The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used. The research was made possible with the financial support of Russian Foundation for Basic Research grant (15-52-06006-MNTI_a).

Published
2016

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