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Surface energy anisotropy of tungsten

Journal Article:

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.
Authors:
Kumar, R; Grenga, H E [1] 
  1. Georgia Inst. of Tech., Atlanta (USA). School of Chemical Engineering
Publication Date:
Oct 01, 1976
Product Type:
Journal Article
Reference Number:
AIX-08-303025; EDB-77-082422
Resource Relation:
Journal Name: Surf. Sci.; (Netherlands); Journal Volume: 59:2
Subject:
36 MATERIALS SCIENCE; TUNGSTEN; ACTIVATION ENERGY; ANISOTROPY; HIGH TEMPERATURE; ION MICROSCOPY; SURFACE TENSION; ULTRAHIGH VACUUM; VERY HIGH TEMPERATURE; ELEMENTS; ENERGY; METALS; MICROSCOPY; REFRACTORY METALS; SURFACE PROPERTIES; TRANSITION ELEMENTS; 360102* - Metals & Alloys- Structure & Phase Studies
OSTI ID:
7116567
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: SUSCA
Submitting Site:
INIS
Size:
Pages: 612-618
Announcement Date:

Journal Article:

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}
}