Surface geometry of pure iridium oxidized at 1373K in air

► Distinct surface morphologies are formed on the grains with different crystal orientations. ► {111} face serves the habit plane. ► PBC vectors are important to affect the etching process and determine the ultimate surface geometry. The surface microstructure of a polished Ir sample during isotherm...

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Bibliographic Details
Published inApplied surface science Vol. 258; no. 4; pp. 1514 - 1518
Main Authors Bao, Z.B., Murakami, H., Yamabe-Mitarai, Y.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2011
Subjects
Faceting
Iridium
Oxidation
Surface structure
Oxidation
Iridium
Surface structure
Faceting
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Summary:► Distinct surface morphologies are formed on the grains with different crystal orientations. ► {111} face serves the habit plane. ► PBC vectors are important to affect the etching process and determine the ultimate surface geometry. The surface microstructure of a polished Ir sample during isothermal heat treatment at 1373K in air was characterized. Various surface morphologies including triangular pits and terraces, “pyramid”-like plateaus and striated edges were observed. Changes in surface geometry were highly dependent on the original grain orientation. Most grains were confirmed to possess or partly exhibit a geometric configuration of {111} faceting habit, while periodic bond chain (PBC) vectors played an important role in determining the ultimate surface morphology. The mechanism and process of how these distinct surface morphologies formed are discussed.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2011.09.121