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503 results on '"Gerward, L."'

27. Pressure effect on crystallization of metallic glass Fe72P11C6Al5B4Ga2 alloy with wide supercooled liquid region

Author

Jiang, J.Z., Olsen, J.S., Gerward, L., Abdali, S., Eckert, J., Schlorke-de Boer, J., Schultz, L., Truckenbrodt, J., and Shi, P.X.

Subjects
Magnetic alloys -- Research, Metallic glasses -- Research, Physics
Abstract

A new study investigates the effect of pressure on the crystallization of metallic glass Fe72P11C6Al5B4Ga2 alloy with wide supercooled liquid region.

Published
2000

29. Grain-size effect on pressure-induced semiconductor-to-metal transition in ZnS

Author

Jiang, J.Z., Gerward, L., Frost, D., Secco, R., Peyronneau, J., and Olsen, J.S.

Subjects
Crystals -- Research, Semiconductors -- Research, Physics
Abstract

A new study uses high-pressure electrical resistance and optical measurements to investigate the grain-size effect on the semiconductor-to-metal transition in ZnS.

Published
1999

30. Glass transition, crystallization kinetics and pressure effect on crystallization of ZrNbCuNiBe bulk metallic glass.

Author

Xing, P. F., Zhuang, Y. X., Wang, W. H., Gerward, L., and Jiang, J. Z.

Subjects
GLASS transition temperature, CRYSTALLIZATION, METALLIC glasses, NUCLEATION
Abstract

The glass transition behavior and crystallization kinetics of Zr[sub 48]Nb[sub 8]Cu[sub 14]Ni[sub 12]Be[sub 18] bulk metallic glass have been investigated by differential scanning calorimetry and x-ray powder diffraction (XRD). The activation energies of both glass transition and crystallization events have been obtained using the Kissinger method. Results indicate that this glass crystallizes by a three-stage reaction: (1) phase separation and primary crystallization of glass, (2) formation of intermetallic compounds, and (3) decomposition of intermetallic compounds and crystallization of residual amorphous phase. The pressure effect on crystallization is studied by in situ high-pressure and high-temperature XRD using synchrotron radiation. Two crystallization temperatures, observed by in-situ XRD, behave differently with varying pressure. The onset crystallization temperature increases with pressure with a slope of 9.5 K/GPa in the range of 0 to 4.4 GPa, while the another crystallization temperature keeps almost unchanged in the applied pressure range. The results are attributed to the competing processes between the thermodynamic potential barrier and the diffusion activation energy under pressure. © 2002 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2002
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33. Basic X-ray interactions with matter

Author

Gerward, L., Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Zittartz, J., editor, Beiglböck, W., editor, Schlenker, M., editor, Fink, M., editor, Goedgebuer, J. P., editor, Malgrange, C., editor, Vieénot, J. Ch., editor, and Wade, R. H., editor

Published
1980
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35. Glass transition, crystallization kinetics and pressure effect on crystallization of ZrNbCuNiBe bulk metallic glass

Author

P.F. Xing, Y.X. Zhuang, W.H. Wang, Gerward, L., and Jiang, J.Z.

Subjects
Calorimeters -- Usage, Crystallization -- Research, Metallic glasses -- Research, Metallic glasses -- Optical properties, X-rays -- Diffraction, X-rays -- Usage, Physics
Abstract

The differential scanning calorimeter (DSC) and x-ray diffraction (XRD) is used to study the glass transition and crystallization behavior of Zr48Nb8Cu14Ni12Be18 bulk metallic glass (BMG). Kissinger analysis is used in study of activation energies of glass transition and crystallization events for the glass.

Published
2002

48. Structural Characterisation of PrBCNO and Pr1.2SCNO

Author

Gerward L, S. Steenstrup, H. Jhans, and J. Staun Olsen

Subjects
Equation of state, Bulk modulus, Optics, Materials science, Condensed matter physics, business.industry, X-ray crystallography, Synchrotron radiation, General Materials Science, General Chemistry, Condensed Matter Physics, business
Published
1998

49. Amorphouslike diffraction pattern in solid metallic titanium

Author

Wang, Y., Fang, Y., Kikegawa, T., Lathe, C., Saksl, K., Franz, H., Schneider, J., Gerward, L., Wu, F., Liu, J., Jiang, J., and 3.3 Chemistry and Physics of Earth Materials, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum

Subjects
550 - Earth sciences
Published
2005

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