Abstract
Field-ion microscopy was used to study the faceting behavior and/or surface energy anisotropy of tungsten in vacuum and in hydrogen. In vacuum below 1700 K the activation energy for (110) facet growth agreed with values previously reported for surface diffusion on tungsten. The observed anisotropy values at 0.5 Tsub(m), where Tsub(m) is the absolute melting temperature of tungsten (approximately 3680 K), were different from those previously reported at higher temperatures and more nearly agreed with broken bond calculations based on Mie potential using m=5, n=8, and a 1.5% lattice expansion. Hydrogen appeared to have a negligible effect on surface energy anisotropy, but did preferentially increase surface diffusion rates on (310) regions.
Citation Formats
Kumar, R, and Grenga, H E.
Surface energy anisotropy of tungsten.
Netherlands: N. p.,
1976.
Web.
Kumar, R, & Grenga, H E.
Surface energy anisotropy of tungsten.
Netherlands.
Kumar, R, and Grenga, H E.
1976.
"Surface energy anisotropy of tungsten."
Netherlands.
@misc{etde_7116567,
title = {Surface energy anisotropy of tungsten}
author = {Kumar, R, and Grenga, H E}
abstractNote = {Field-ion microscopy was used to study the faceting behavior and/or surface energy anisotropy of tungsten in vacuum and in hydrogen. In vacuum below 1700 K the activation energy for (110) facet growth agreed with values previously reported for surface diffusion on tungsten. The observed anisotropy values at 0.5 Tsub(m), where Tsub(m) is the absolute melting temperature of tungsten (approximately 3680 K), were different from those previously reported at higher temperatures and more nearly agreed with broken bond calculations based on Mie potential using m=5, n=8, and a 1.5% lattice expansion. Hydrogen appeared to have a negligible effect on surface energy anisotropy, but did preferentially increase surface diffusion rates on (310) regions.}
journal = {Surf. Sci.; (Netherlands)}
volume = {59:2}
journal type = {AC}
place = {Netherlands}
year = {1976}
month = {Oct}
}
title = {Surface energy anisotropy of tungsten}
author = {Kumar, R, and Grenga, H E}
abstractNote = {Field-ion microscopy was used to study the faceting behavior and/or surface energy anisotropy of tungsten in vacuum and in hydrogen. In vacuum below 1700 K the activation energy for (110) facet growth agreed with values previously reported for surface diffusion on tungsten. The observed anisotropy values at 0.5 Tsub(m), where Tsub(m) is the absolute melting temperature of tungsten (approximately 3680 K), were different from those previously reported at higher temperatures and more nearly agreed with broken bond calculations based on Mie potential using m=5, n=8, and a 1.5% lattice expansion. Hydrogen appeared to have a negligible effect on surface energy anisotropy, but did preferentially increase surface diffusion rates on (310) regions.}
journal = {Surf. Sci.; (Netherlands)}
volume = {59:2}
journal type = {AC}
place = {Netherlands}
year = {1976}
month = {Oct}
}