Solid Solubility of Oxygen In Columbium

Seybolt, A. U.

doi:10.1007/bf03377426

Cited by 21 publications

(21 citation statements)

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“…The basic assumption of the discussion to follow is that the adsorption of oxygen at the reaction boundary is much faster than the subsequent rate-controlling step and may be treated as an equilibrium process. A previous paper (11) develops concepts based on this assumption in detail and illustrates that application of the Theory of Absolute Reaction Rates (15) ~sults in the following kinetic expression for an oxidation process governed by a boundary reaction, rate = din~dr = ko.f (9). Where interaction between the adsorbed molecules is negligible and the assumption of equilibrium allowable, the expression for f(O) employed in the explanation of the linear oxidation of tantalum (11,12) is suitable and equation (I) becomes,…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

High Pressure Oxidation of Niobium

Bridges¹,

Fassell²

1956

J. Electrochem. Soc.

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Niobium oxidizes according to the linear rate law from 400~176 (14.7-605 psia O2). The oxidation rate is extremely pressure sensitive above 550~ Theoretical considerations indicate that an equilibrium adsorption process occurs prior to the rate-determining step. It was necessary to include a term in the rate equation for the interaction between the adsorbed molecules to interpret results above 650~ The interaction energy is influenced by the initial orientation of the metal surface. The activation energy for the oxidation process is approximately 9 to 10 kcal (500~176

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Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

High Pressure Oxidation of Niobium

Bridges¹,

Fassell²

1956

J. Electrochem. Soc.

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“…% Y, the drop in the parameter presumably being caused by the scavenging of oxygen by the added yttrium. The lowest value of a-parameter actually observed by Seybolt ( 6 ) during his work on the Cb-0 system was 3.3002 + 0.0002 R, and extrapolating back to zero oxygen a lattice parameter of 3.2999 R is obtained. The same result is obtained by Gebhardt and Rothenbacher.…”

Section: The Lattice Parameter Of Pure Columbiummentioning

confidence: 81%

“…Biauer ( 5 .oncluded that the solid-solubility limit of oxygen in columbium lay below 4.7 at. 5, whereas Seybolt ( 6 ) using a Sieverts apparatus to meter the amount of oxygen added, found values ranging between 1.4 and 5.5 at. % oxygen in the temperature range 775 to 11O 0°C .…”

Section: (A)mentioning

confidence: 99%

Research for Solubility of Interstitials in Columbium. Ii. A Study of Columbium-Rich Alloys in the Ternary Systems Cb-Hf-O, Cb-Hf-N, and Cb-Hf-C

Taylor¹

1965

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“…According to A. Seybolt [235], the maximum solubility of oxygen in niobium in the temperature range 775-1100°C varies from 1.4 to 5.5 at.%, and according to [236] the limit saturation of oxygen in solid solution with niobium between 700 and 1550°C varies from 0.7 to 5.5 at. %.…”

Section: Interaction With Oxygenmentioning

confidence: 99%

Physical Metallurgy of Refractory Metals and Alloys

Savitskii¹,

Burkhanov²

1995

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All rights reservedNo part of this publication may be reproduced in any form without written permission from the publisher PREFACE TO THE AMERICAN EDITIONThe principal reasons which induced the authors to write this book and the features of the book are set forth in the preface to the Russian edition.That section of the science of metals which in Russian is called "metallovedenie" or the "physical chemistry of metals" is generally referred to in scientific and technical literature published in the English language by the term "physical metallurgy." These concepts are much broader than the term" metallography," used in the scientific and technical literature of various countries, and applied solely to research on the interrelationships of the structure and properties of metals and alloys.Each science must have its own subject and its own method of research. Certainly, all specialists will agree that metals and alloys, including their solid solutions, mechanical mixtures, and metallic compounds, form the subject of "physical metallurgy" or "physical chemistry of metals." The aim of this science. is to produce a theory and to elucidate the experimental relationships which ought finally to make it possible to calculate quantitatively alloys Of given properties for any working conditions and parameters.With regard to the methods of research on metals and alloys, we assume that "physical metallurgy" may properly employ any theoretical and experimental methods which will help to solve its basic problems. The experience of the last few decades has shown that among the experimental methods a leading position is occupied by the physicochemical analysis of metal systems developed by N. S. Kurnakov, that is to say, the systematic investigation of the phYSical properties of alloys as a function of he variation of their chemical composition and phase composition. This method has also been employed for investigating the interrelationship of the structure and properties of alloys at different temperatures and pressures (see E. M. Savitsky, The Influence of Temperature on the Mechanical Properties of Metals and Alloys, Stanford University Press, 1961). The "physical chemistry of metals" makes extensive use of physicochemical analysis. The science of metals and alloys absorbs all the achievements of the exact fundamental sciences, primarily physics and chemistry. It may even be said more precisely:The "physical chemistry of metals" or "physical metallurgy" is the synthesis of the physics of metals and the chemistry of metal alloys. The distribution and energy of electrons is the basic factor determining the crystal structure and all the properties of metals and alloys. The main problems which have to be solved in the framework of these sciences are the following: the electronic structure and nature of the interatomic bond in metal crystals, solid solutions of metals and metallic compounds, the development of methods for the quantitative measurement of the value of the interatomic forces with variation in the fundamental parameters...

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Solid Solubility of Oxygen In Columbium

Cited by 21 publications

References 1 publication

High Pressure Oxidation of Niobium

High Pressure Oxidation of Niobium

Research for Solubility of Interstitials in Columbium. Ii. A Study of Columbium-Rich Alloys in the Ternary Systems Cb-Hf-O, Cb-Hf-N, and Cb-Hf-C

Physical Metallurgy of Refractory Metals and Alloys

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