{"id":{"repo_id":"the-open-u","oai_identifier":"oai:oro.open.ac.uk:19842"},"canonical_url":"https://search.dev.ndltd.org/etd/the-open-u/oai:oro.open.ac.uk:19842","repository":{"repo_id":"the-open-u","name":"The Open University","base_url":"https://oro.open.ac.uk/cgi/oai2"},"display":{"title":"Hydrogen Permeation Through Nickel And Nickel Alloys: Surface Reactions And Trapping","abstract":"The frequency variations of attenuation and phase lag of the modulated gas flow through thin metal foils have characteristic features whether permeation is diffusion controlled, is influenced by surface reactions or affected by internal trapping.
Analysis of data obtained for hydrogen permeation through nickel show that hydrogen is dissociatively chemisorbed in nickel.
The permeation parameters diffusivity, permeability and surface reaction rate obtained for nickel are:
D/(m2s-1) = 7.12 x 1-7 exp [-4.64 x 103/RT/(K)]
Pm/(molH2m-1s-1Pa-1/2 = 3.35 x 10-7 exp[-54.25 x 103/RT/(K)]
Ksm/(molH2m-3Pa-1/2) = 0.47 exp[-13.6 x 103/RT/(K)]
K1/(molH2m-2s-1Pa-1) = 1.44 x 1-6 exp[-29.68 x 103/RT/(K)]
Where R=8314Jmol-1
The experiments conducted on cold-worked nickel have revealed that hydrogen is trapped within the bulk during the permeation in this material.
A series of experiments conducted on cold worked nickel+2% thoria has also revealed that hydrogen is trapped within the bulk during the permeation. Analysis of data obtained for cold worked nickel+2% thoria suggest that hydrogen is trapped at the dislocation networks around thoria particles.
Frequency variation of attenuation and phase lag of the modulated flow show that hydrogen trapping in both cold-worked nickel and nickel+2% thoria is in dynamic equilibrium. A trap depth of 40 kJ/mol has been obtained for nickel+2% thoria.","abstract_html":"The frequency variations of attenuation and phase lag of the modulated gas flow through thin metal foils have characteristic features whether permeation is diffusion controlled, is influenced by surface reactions or affected by internal trapping.<br></br><br></br>Analysis of data obtained for hydrogen permeation through nickel show that hydrogen is dissociatively chemisorbed in nickel.<br></br><br></br>The permeation parameters diffusivity, permeability and surface reaction rate obtained for nickel are:<br></br><br></br>D/(m<sup>2</sup>s-1) = 7.12 x 1-7 exp [-4.64 x 103/RT/(K)]<br></br><br></br>P<sub>m</sub>/(molH<sub>2</sub>m<sup>-1</sup>s<sup>-1</sup>Pa<sup>-1/2</sup> = 3.35 x 10<sup>-7</sup> exp[-54.25 x 10<sup>3</sup>/RT/(K)]<br></br><br></br>K<sub>sm</sub>/(molH<sub>2</sub>m<sup>-3</sup>Pa<sup>-1/2</sup>) = 0.47 exp[-13.6 x 10<sup>3</sup>/RT/(K)] <br></br><br></br>K<sub>1</sub>/(molH<sub>2</sub>m<sup>-2</sup>s<sup>-1</sup>Pa<sup>-1</sup>) = 1.44 x 1<sup>-6</sup> exp[-29.68 x 10<sup>3</sup>/RT/(K)]<br></br><br></br>Where R=8314Jmol<sup>-1</sup><br></br><br></br>The experiments conducted on cold-worked nickel have revealed that hydrogen is trapped within the bulk during the permeation in this material.<br></br><br></br>A series of experiments conducted on cold worked nickel+2% thoria has also revealed that hydrogen is trapped within the bulk during the permeation. Analysis of data obtained for cold worked nickel+2% thoria suggest that hydrogen is trapped at the dislocation networks around thoria particles.<br></br><br></br>Frequency variation of attenuation and phase lag of the modulated flow show that hydrogen trapping in both cold-worked nickel and nickel+2% thoria is in dynamic equilibrium. A trap depth of 40 kJ/mol has been obtained for nickel+2% thoria.","abstract_has_math":false,"creators":["Altunoglu, Abdulkadir"],"institution":"The Open University","degree_name":"phd","degree_level":"doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1994,"date_issued":"1994-04","date_published":"1994-04","updated_at":"2026-07-24T05:01:55Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Altunoglu, Abdulkadir"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1994-04-22"]},{"key":"dc:date.issued","label":"Date","values":["1994-04"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["ARRAY(0x7ffb40481b58)"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["The Open University"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://oro.open.ac.uk/19842/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["phd"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://oro.open.ac.uk/19842/1/pdf71.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The frequency variations of attenuation and phase lag of the modulated gas flow through thin metal foils have characteristic features whether permeation is diffusion controlled, is influenced by surface reactions or affected by internal trapping.
Analysis of data obtained for hydrogen permeation through nickel show that hydrogen is dissociatively chemisorbed in nickel.
The permeation parameters diffusivity, permeability and surface reaction rate obtained for nickel are:
D/(m2s-1) = 7.12 x 1-7 exp [-4.64 x 103/RT/(K)]
Pm/(molH2m-1s-1Pa-1/2 = 3.35 x 10-7 exp[-54.25 x 103/RT/(K)]
Ksm/(molH2m-3Pa-1/2) = 0.47 exp[-13.6 x 103/RT/(K)]
K1/(molH2m-2s-1Pa-1) = 1.44 x 1-6 exp[-29.68 x 103/RT/(K)]
Where R=8314Jmol-1
The experiments conducted on cold-worked nickel have revealed that hydrogen is trapped within the bulk during the permeation in this material.
A series of experiments conducted on cold worked nickel+2% thoria has also revealed that hydrogen is trapped within the bulk during the permeation. Analysis of data obtained for cold worked nickel+2% thoria suggest that hydrogen is trapped at the dislocation networks around thoria particles.
Frequency variation of attenuation and phase lag of the modulated flow show that hydrogen trapping in both cold-worked nickel and nickel+2% thoria is in dynamic equilibrium. A trap depth of 40 kJ/mol has been obtained for nickel+2% thoria."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Hydrogen Permeation Through Nickel And Nickel Alloys: Surface Reactions And Trapping"]}]}],"canonical_facts":{"dc:creator":["Altunoglu, Abdulkadir"],"dc:date":["1994-04-22"],"dc:date.issued":["1994-04"],"dc:description.abstract":["The frequency variations of attenuation and phase lag of the modulated gas flow through thin metal foils have characteristic features whether permeation is diffusion controlled, is influenced by surface reactions or affected by internal trapping.
Analysis of data obtained for hydrogen permeation through nickel show that hydrogen is dissociatively chemisorbed in nickel.
The permeation parameters diffusivity, permeability and surface reaction rate obtained for nickel are:
D/(m2s-1) = 7.12 x 1-7 exp [-4.64 x 103/RT/(K)]
Pm/(molH2m-1s-1Pa-1/2 = 3.35 x 10-7 exp[-54.25 x 103/RT/(K)]
Ksm/(molH2m-3Pa-1/2) = 0.47 exp[-13.6 x 103/RT/(K)]
K1/(molH2m-2s-1Pa-1) = 1.44 x 1-6 exp[-29.68 x 103/RT/(K)]
Where R=8314Jmol-1
The experiments conducted on cold-worked nickel have revealed that hydrogen is trapped within the bulk during the permeation in this material.
A series of experiments conducted on cold worked nickel+2% thoria has also revealed that hydrogen is trapped within the bulk during the permeation. Analysis of data obtained for cold worked nickel+2% thoria suggest that hydrogen is trapped at the dislocation networks around thoria particles.
Frequency variation of attenuation and phase lag of the modulated flow show that hydrogen trapping in both cold-worked nickel and nickel+2% thoria is in dynamic equilibrium. A trap depth of 40 kJ/mol has been obtained for nickel+2% thoria."],"dc:format":["application/pdf"],"dc:identifier.uri":["https://oro.open.ac.uk/19842/1/pdf71.pdf"],"dc:language":["en"],"dc:publisher.department":["ARRAY(0x7ffb40481b58)"],"dc:publisher.institution":["The Open University"],"dc:relation.isreferencedby":["https://oro.open.ac.uk/19842/"],"dc:title":["Hydrogen Permeation Through Nickel And Nickel Alloys: Surface Reactions And Trapping"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["doctoral"],"dc:type.qualificationname":["phd"]},"updated_at":"2026-07-24T05:01:55Z"}