Nuclear Instruments and Methods in Physics Research Section B:

1999

DOI: 10.1016/s0168-583x(98)00544-8

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Stability studies of Hg implanted YBa2Cu3O6+x

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Abstract: High quality YBa 2 Cu 3 O 6x (YBCO) superconducting thin ®lms were implanted with the radioactive 197m Hg (T 1a2 24 h) isotope to low¯uences of 10 13 atoms/cm 2 and 60 keV energy. The lattice location and stability of the implanted Hg were studied combining the Perturbed Angular Correlation (PAC) and Emission Channeling (EC) techniques. We show that Hg can be introduced into the YBCO lattice by ion implantation into a unique regular site. The EC data show that Hg is located on a highly symmetric site on the YB… Show more

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“…Up to now, the detection systems have been applied successfully in emission channeling experiments using the following isotopes: 24 Na, 45 …”

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confidence: 99%

Position-sensitive Si pad detectors for electron emission channeling experiments

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Nuclear Instruments and Methods in Physics Research Section A:

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Position-sensitive detector systems, initially developed for the detection of X-rays, have been adapted for their use in electron emission channeling experiments. Each detection system consists of a 30.8×30.8 mm 2 22×22-pad Si detector, either of 0.3 mm, 0.5 mm or 1 mm thickness, four 128-channel preamplifier chips, a backplane trigger circuit, a sampling analog to digital converter, a digital signal processor, and a personal computer for data display and storage. The operational principle of these detection systems is described, and characteristic features such as energy and position resolution and maximum count rate, which have been determined from tests with conversion electrons and β − particles in the energy range 40-600 keV, are presented.

“…Up to now, the detection systems have been applied successfully in emission channeling experiments using the following isotopes: 24 Na, 45 …”

mentioning

confidence: 99%

Position-sensitive Si pad detectors for electron emission channeling experiments

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,

²

,

³

et al. 2004

Nuclear Instruments and Methods in Physics Research Section A:

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Position-sensitive detector systems, initially developed for the detection of X-rays, have been adapted for their use in electron emission channeling experiments. Each detection system consists of a 30.8×30.8 mm 2 22×22-pad Si detector, either of 0.3 mm, 0.5 mm or 1 mm thickness, four 128-channel preamplifier chips, a backplane trigger circuit, a sampling analog to digital converter, a digital signal processor, and a personal computer for data display and storage. The operational principle of these detection systems is described, and characteristic features such as energy and position resolution and maximum count rate, which have been determined from tests with conversion electrons and β − particles in the energy range 40-600 keV, are presented.

Stability and diffusion of Hg implanted YBa2Cu3O6+x

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et al. 1999

Nuclear Instruments and Methods in Physics Research Section B:

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The radioactive isotope 197m Hg was implanted at 60 keV with low¯uences (10 13 ions/cm 2 ) into YBa 2 Cu 3 O 6x (YBCO) superconducting thin ®lms at ISOLDE/CERN. We report on the Hg dynamics and stability inside the YBCO lattice as a function of annealing temperature up to 890 K in a vacuum or O 2 atmosphere. The perturbed angular correlation (PAC) technique was used for probing the Hg behavior at the atomic scale, while by monitoring the sampleÕs activity in situ the Hg outdiusion was studied. We found that Hg ions occupy unique lattice sites and that Hg should be bound to two apical oxygens. Hg diusion occurs only for annealing temperatures above 653 K, in vacuum. The Hg migration energy was estimated to be E M 1.58 0.15 eV. Ó

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Hyperfine Interactions

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