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DC Field | Value | Language |
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dc.contributor.advisor | Nicholson, P.S. | en_US |
dc.contributor.advisor | Smeltzer, W.W. | en_US |
dc.contributor.author | Porter, Lawrence Richard | en_US |
dc.date.accessioned | 2014-06-18T16:40:59Z | - |
dc.date.available | 2014-06-18T16:40:59Z | - |
dc.date.created | 2010-08-18 | en_US |
dc.date.issued | 1978-02 | en_US |
dc.identifier.other | opendissertations/3161 | en_US |
dc.identifier.other | 4180 | en_US |
dc.identifier.other | 1455789 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/7916 | - |
dc.description.abstract | <p>A study has been made of the initial stage sintering kinetics of nonstoichiometric MnO as a function of the oxygen partial pressure. The shrinkage and neck growth were measured for pairs of oxide spheres in the temperature range 900-1100°C and pressure range 10ˉ¹⁴</p> <p>The shrinkage was analyzed using both the classical single mechanism control approach and the more recent simultaneous mechanism approach. It was found that the sintering behavior as a function of oxygen pressure, hence the concentration of Mn vacancies, does not follow a simple relationship has been suggested. The kinetics indicate grain boundary diffusIon control at oxygen pressures less than 10ˉ¹² atm. and greater than 10ˉ⁹ atm. and volume diffusion control at pressures in between.</p> <p>Using the simultaneous mechanism approach, the predominance of grain boundary control at low and high oxygen pressures was verified; however, a substantial contribution from volume diffusion was present. The volume diffusion contribution reached a maximum at 1 x 10ˉ¹⁰ atm., the same pressure at which the maximum shrinkage and shrinkage rate was found.</p> <p>Diffusion coefficients calculated from both methods of analysis agree well with published values and with the published defect structure for MnO.</p> <p>The surface topography of the spheres was studied. It was found to influence the sintering behavior substantially and to be dependent on the atmosphere composition. A qualitative model for the effect of surface topography is presented.</p> | en_US |
dc.subject | Materials Science and Engineering | en_US |
dc.subject | Metallurgy | en_US |
dc.subject | Materials Science and Engineering | en_US |
dc.title | The Effect of Nonstoichiometry on the Initial Sintering Kinetics of MnO₁₊ᵪ | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Metallurgy and Materials Science | en_US |
dc.description.degree | Doctor of Philosophy (PhD) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
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File | Size | Format | |
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fulltext.pdf | 5.95 MB | Adobe PDF | View/Open |
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