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Title: REACTIONS IN THE NIOBIUM-HYDROGEN SYSTEM

Abstract

Equilibria in the niobium- hydrogen system were determined in the range 100 to 900- deg , 0.1 to 1000 mm of mercury hydrogen pressure, and hydrogen/ niobium atomic ratios of 0.01 to 0.85. X-ray measurements were obtainpd at 25 to 400 deg C at hydrogen/niobium ratios up to 0.54. The studies showed thnt a solid solution of hydrogen in niobium is produced throughout most of the system. A miscibility gap was found at low temperatures and pressures, with a critical point at about a temperature of 140 deg C, a hydrogen pressure of 0.01 mm of mercury, and a hydrogen/niobium ratio of 0.3. Sorption rates at 300 to 550 deg C wore initially linear. At higher temperatures, sorption rates were controlled by diffusion in the metal matrix. Diffusion coefficients at 600 to 700 deg C can be expressed by D = 0.0215 exp STA(-9370 plus or minus 600)/RT!. Desorption rates were lower than those predicted by diffusion. (auth)

Authors:
; ;
Publication Date:
Research Org.:
Battelle Memorial Inst., Columbus, Ohio
OSTI Identifier:
4263785
Report Number(s):
BMI-1332
NSA Number:
NSA-13-011822
DOE Contract Number:  
W-7405-ENG-92
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
METALLURGY AND CERAMICS; ADSORPTION; DIFFUSION; EQUATIONS; HYDROGEN; MEASURED VALUES; NIOBIUM; PRESSURE; REACTION KINETICS; SOLID SOLUTIONS; TEMPERATURE; X RADIATION

Citation Formats

Albrecht, W.M., Goode, W.D. Jr., and Mallett, M.W. REACTIONS IN THE NIOBIUM-HYDROGEN SYSTEM. United States: N. p., 1959. Web. doi:10.2172/4263785.
Albrecht, W.M., Goode, W.D. Jr., & Mallett, M.W. REACTIONS IN THE NIOBIUM-HYDROGEN SYSTEM. United States. doi:10.2172/4263785.
Albrecht, W.M., Goode, W.D. Jr., and Mallett, M.W. Wed . "REACTIONS IN THE NIOBIUM-HYDROGEN SYSTEM". United States. doi:10.2172/4263785. https://www.osti.gov/servlets/purl/4263785.
@article{osti_4263785,
title = {REACTIONS IN THE NIOBIUM-HYDROGEN SYSTEM},
author = {Albrecht, W.M. and Goode, W.D. Jr. and Mallett, M.W.},
abstractNote = {Equilibria in the niobium- hydrogen system were determined in the range 100 to 900- deg , 0.1 to 1000 mm of mercury hydrogen pressure, and hydrogen/ niobium atomic ratios of 0.01 to 0.85. X-ray measurements were obtainpd at 25 to 400 deg C at hydrogen/niobium ratios up to 0.54. The studies showed thnt a solid solution of hydrogen in niobium is produced throughout most of the system. A miscibility gap was found at low temperatures and pressures, with a critical point at about a temperature of 140 deg C, a hydrogen pressure of 0.01 mm of mercury, and a hydrogen/niobium ratio of 0.3. Sorption rates at 300 to 550 deg C wore initially linear. At higher temperatures, sorption rates were controlled by diffusion in the metal matrix. Diffusion coefficients at 600 to 700 deg C can be expressed by D = 0.0215 exp STA(-9370 plus or minus 600)/RT!. Desorption rates were lower than those predicted by diffusion. (auth)},
doi = {10.2172/4263785},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1959},
month = {4}
}