Proton Irradiation Enhancement of Low-Field Negative Magnetoresistance Sensitivity of AlGaN/GaN-Based Magnetic Sensor at Cryogenic Temperature

Resistivity recovery experiments are performed on α-Fe and an Fe - 220 at. ppm C alloy after 5 MeV proton irradiation at cryogenic temperature of 50 K. By comparing the recovery spectra of pure Fe and the Fe-C alloy we are able to resolve the effect of carbon atoms on the point defect kinetics. It is observed that carbon interacts with both interstitial and vacancy type of defects and delays their annihilation. At temperatures above 500 K the formation of carbides reduces the resistivity of the alloy.

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Proton irradiation and resistivity recovery in stages I & II of pure and carbon-doped Fe

HNPS Proceedings ◽

10.12681/hnps.3007 ◽

2020 ◽

Vol 27 ◽

pp. 148

Author(s):

Andreas Theodorou ◽

M. Syskaki ◽

Z. Kotsina ◽

M. Axiotis ◽

G. Apostolopoulos

Keyword(s):

Electrical Resistivity ◽

Cryogenic Temperature ◽

Proton Irradiation ◽

Radiation Defects ◽

Tandem Accelerator ◽

Carbon Doped ◽

Post Irradiation ◽

Solute Atoms ◽

Mev Protons

Pure and C-doped Fe specimens were irradiated with 5 MeV protons at cryogenic temperature at the NCSR-"Demokritos" TANDEM accelerator in order to investigate the interactions between carbon atoms and radiation defects. During the subsequent post-irradiation isochronal annealing up to 180 K the defects start to migrate and interact either mutually or with the C impurities. The defect evolution is observed by in-situ electrical resistivity recovery measurements. Comparison of results from pure and C-doped Fe specimens reveals the effect of C solute atoms on the defect kinetics.

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Low-field negative magnetoresistance in the variable-range-hopping regime in copper indium diselenide

Physical Review B ◽

10.1103/physrevb.50.18040 ◽

1994 ◽

Vol 50 (24) ◽

pp. 18040-18045 ◽

Cited By ~ 28

Author(s):

L. Essaleh ◽

J. Galibert ◽

S. M. Wasim ◽

E. Hernández ◽

J. Leotin

Keyword(s):

Negative Magnetoresistance ◽

Copper Indium Diselenide ◽

Variable Range Hopping ◽

Variable Range ◽

Low Field ◽

Copper Indium

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Low-field negative magnetoresistance in double-layer structures

Physical Review B ◽

10.1103/physrevb.62.17089 ◽

2000 ◽

Vol 62 (24) ◽

pp. 17089-17093 ◽

Cited By ~ 7

Author(s):

G. M. Minkov ◽

A. V. Germanenko ◽

O. E. Rut ◽

O. I. Khrykin ◽

V. I. Shashkin ◽

...

Keyword(s):

Double Layer ◽

Negative Magnetoresistance ◽

Low Field ◽

Layer Structures

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Phase Transformation In Ti-6al-4v Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100096175 ◽

1972 ◽

Vol 30 ◽

pp. 584-585

Author(s):

Shiro Fujishiro

Keyword(s):

Phase Transformation ◽

Grain Boundary ◽

Cryogenic Temperature ◽

Β Phase ◽

Heat Treated ◽

Mixed Microstructure ◽

Ductile Behavior

The Ti-6 wt.% Al-4 wt.% V commercial alloys have exhibited an improved formability at cryogenic temperature when the alloys were heat-treated prior to the tests. The author was interested in further investigating this unusual ductile behavior which may be associated with the strain-induced transformation or twinning of the a phase, enhanced at lower temperatures. The starting materials, supplied by RMI Co., Niles, Ohio were rolled mill products in the form of 40 mil sheets. The microstructure of the as-received materials contained mainly ellipsoidal α grains measuring between 1 and 5μ. The β phase formed an undefined grain boundary around the a grains. The specimens were homogenized at 1050°C for one hour, followed by aging at 500°C for two hours, and then quenched in water to produce the α/β mixed microstructure.

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