Observation of a rapid amorphization reaction

Journal Article · Sat Aug 01 00:00:00 EDT 1992 · Journal of Materials Research; (United States)

DOI:https://doi.org/10.1557/JMR.1992.1976· OSTI ID:7019441

Hufnagel, T C ^[1]; Brennan, S ^[2]; Payne, A P; Clemens, B M ^[1]

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1. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-2205 (United States)
2. Stanford Synchrotron Radiation Laboratory, Stanford, California 94309-2205 (United States)

We have observed a rapid amorphization reaction at ambient temperature in the Gd/Co system by employing grazing incidence x-ray scattering. We find that a 135 A crystalline Gd film is amporhized in less than 30 min by deposition of Co. We postulate that the rapidity of the reaction is due to surface diffusion of Co atoms after deposition to fast diffusion sites such as grain boundaries in the Gd film. Once the interfacial region has been amorphized these fast diffusion paths are sealed off from the surface, rapid diffusion of Co into the Gd crystalline layer is prevented, and the amorphization reaction stops.

• OSTI ID: 7019441
• Journal Information: Journal of Materials Research; (United States), Vol. 7:8; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT
PHASE TRANSFORMATIONS
GADOLINIUM
AMORPHOUS STATE
DEPOSITION
DIFFUSION
INTERFACES
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
X-RAY DIFFRACTION
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
FILMS
METALS
RARE EARTHS
SCATTERING
TEMPERATURE RANGE
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies