Positron lifetime calculation for the elements of the periodic table

Campillo-Robles, Jose Miguel; Ogando, E.; Plazaola, F.

doi:10.1088/0953-8984/19/17/176222

Cited by 205 publications

(179 citation statements)

References 68 publications

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“…In fact, in the positron lifetime spectrum measured for virgin samples, only one lifetime component equal to 241 ± 1 ps was resolved. This corresponds well with the data reported in the literature as the bulk lifetime for bismuth (see, e.g., the paper of Campillo et al [18]). …”

Section: Sample Preparationsupporting

confidence: 93%

“…For instance, for a vacancy the positron lifetime is longer than in bulk by a factor of 3/2. There are numerous papers devoted to the experimental measurements and theoretical calculations of the positron lifetime for bulk at different materials and defects, because these values are fingerprints that can be used for defect identification [18].…”

Section: Positron Lifetime Measurementsmentioning

confidence: 99%

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The Annealing Behavior of the Subsurface Zone Induced by Friction in Bismuth Detected by Positron Lifetime Technique

Dryzek

2013

Tribol Lett

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The annealing behavior of the subsurface zone (SZ) in pure bismuth induced by dry sliding was studied using the positron lifetime measurement. This measurement allows us to detect the SZ and its recovery, and recrystallization processes. The comparative measurements of the sample exposed to compression revealed the thermal stability of the SZ. The compressed sample rebuilt its structure due to the recovery and recrystallization processes at the temperature of 60°C, whereas the sample exposed to dry sliding does it at higher temperature of 260°C, which is close to the melting point. The isothermal annealing at the temperature of 100°C confirmed these results. The defect depth profile induced by dry sliding evolves with the annealing temperature in such a way that the concentration of defects at the worn surface gradually decreases, but at the depth between 50 and 170 lm, the generation of new defects takes place at the temperature of 75, 100 and even at 175°C. At the temperature of 175°C, the defects still are extended up to the depth of about 60 lm from the worn surface. The results were qualitatively confirmed by the measurements of the Vickers microhardness depth profile. Similar annealing behavior of the SZ was observed in pure magnesium.

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Section: Sample Preparationsupporting

confidence: 93%

Section: Positron Lifetime Measurementsmentioning

confidence: 99%

The Annealing Behavior of the Subsurface Zone Induced by Friction in Bismuth Detected by Positron Lifetime Technique

Dryzek

2013

Tribol Lett

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“…In fact, the PLS measured for virgin samples contained only one lifetime component equal to 162 ± 1 ps. This corresponds well with the data reported in the literature as the bulk lifetime for Zr [10].…”

Section: Sample Preparationsupporting

confidence: 92%

“…There are numerous papers devoted to the experimental measurements, and theoretical calculations of the positron lifetime for bulk and defects of different materials, because these values are fingerprints which can be used for defect identification. This is the outline of the PALS frequently used for materials studies [5,10].…”

Section: Positron Lifetime Measurementsmentioning

confidence: 99%

Formation of Subsurface Zone Induced by Sliding Wear in Zirconium Studied by Positron Lifetime Spectroscopy

Dryzek

Siemek

2016

Tribol Lett

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The zone below the surface in pure Zr exposed to dry sliding is the subject of studies using positron lifetime methods. New type of the defect depth profile is observed. The zone contains dislocations and vacancy clusters which occur only at a certain depth from the worn surface. The size of the vacancy clusters decreases with the depth increase. The total depth of the subsurface zone is about hundreds of micrometers and depends on the applied load. The estimated effective strain in the subsurface zone decreases exponentially with the depth increase. The similar kinds of defects and their depth profiles are observed also for the Zr samples exposed to sandblasting. This indicates the common origin of formation of the subsurface zone during dry sliding and sandblasting. Results of the theoretical calculations of the positron lifetime in vacancy clusters in Zr are also presented.

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“…5 Mn 28. 5 Ga 22 (at. %) were prepared from high purity elements by arc melting under protective Ar atmosphere.…”

Section: Experimental and Computational Methodsmentioning

confidence: 99%

Positron Annihilation Spectroscopy Study of NiMnGa Modulated and Non-Modulated Martensitic Phases

Mérida

Garcı́a

Apiñaniz

et al. 2009

MSF

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Abstract.We have studied by means of positron lifetime measurements the role that vacancy type defects play in the martensitic transformation in magnetic Ni-Mn-Ga shape memory alloys. The measurements presented in this work have been performed in two ternary alloys transforming to modulate and non-modulated martensitic phases. Positron experiments have been realized at room temperature after subsequent isochronal heating at different temperatures up to a maximum temperature of 600ºC. Positron results show a large variation of the average lifetime value with the isochronal annealing temperature in non-modulated samples. However, the response in the modulated samples is quite different. These results obtained in both samples are discussed in term of different type of positrons trapping defects and their evolution with the annealing temperature. They have also been compared with Differential Scanning Calorimetry experiments performed in the same samples. The work states the clear influence of the vacancy concentration on the martensitic transformations of these alloys.

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Positron lifetime calculation for the elements of the periodic table

Cited by 205 publications

References 68 publications

The Annealing Behavior of the Subsurface Zone Induced by Friction in Bismuth Detected by Positron Lifetime Technique

The Annealing Behavior of the Subsurface Zone Induced by Friction in Bismuth Detected by Positron Lifetime Technique

Formation of Subsurface Zone Induced by Sliding Wear in Zirconium Studied by Positron Lifetime Spectroscopy

Positron Annihilation Spectroscopy Study of NiMnGa Modulated and Non-Modulated Martensitic Phases

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