2013
DOI: 10.1063/1.4816274
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Low temperature study of structural phase transitions in niobium hydrides

Abstract: Niobium (Nb) and its hydrides have been the focus of many studies due to applications as a hydrogen storage material, as a dielectric coating in semiconductor devices and in superconducting radio-frequency cavities. In this paper, we will present the atomic-scale characterization of Nb hydrides using scanning transmission electron microscopy and electron energy loss spectroscopy (EELS) at room and liquid nitrogen temperatures. Although such cavities are formed from ultrahigh purity Nb, using electron beam diff… Show more

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Cited by 15 publications
(12 citation statements)
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“…21,24,27 However, low temperature SAED on the samples prepared from the cavity cutouts did not reveal any additional reflections. The absence of an additional reflection in SAED patterns can be explained either by negligibly small SAED signal from nano-scale niobium hydrides or by their fast dissociation under the broad electron beam.…”
Section: Cryogenic Temperature Measurementsmentioning
confidence: 88%
See 1 more Smart Citation
“…21,24,27 However, low temperature SAED on the samples prepared from the cavity cutouts did not reveal any additional reflections. The absence of an additional reflection in SAED patterns can be explained either by negligibly small SAED signal from nano-scale niobium hydrides or by their fast dissociation under the broad electron beam.…”
Section: Cryogenic Temperature Measurementsmentioning
confidence: 88%
“…Formation of low temperature stoichiometric niobium hydrides in Nb samples was previously detected by SAED for various hydrogen concentrations 18,21,24 . However, low temperature SAED on the samples prepared from the cavity cutouts did not reveal any additional reflections.…”
Section: Cryogenic Temperature Measurementsmentioning
confidence: 90%
“…The HAADF study was conducted using the JEOL ARM 200 STEM at the University of Illinois at Chicago with a probe side spherical aberration corrector operated at 200 keV. 46 Before a typical HAADF experiment, the Au−CeO 2 nanostructures were mixed with ethanol to make a suspension, and a small amount of the suspension was then applied to a copper grid coated with lacey carbon film. The grid was then transferred into the microscope column with a vacuum of ∼10 −8 Torr.…”
mentioning
confidence: 99%
“…The presence of a "dead" layer is a general feature observed in many LE-µSR studies. While the true origin of d has not yet been firmly established, a plausible explanation is based on surface roughness [25] which is also theoretically supported [26]. We used the literature values ξ 0 = 39 nm and ℓ = 400 nm as fixed input parameters, while d and λ L were allowed to vary.…”
mentioning
confidence: 99%