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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Oxidation of Ir(111): From O-Ir-O Trilayer to Bulk Oxide Formation
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Oxidation of Ir(111): From O-Ir-O Trilayer to Bulk Oxide Formation

机译:Ir(111)的氧化:从O-Ir-O三层到本体氧化物的形成

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The oxidation of the Ir(111) surface was studied by in situ surface X-ray diffraction (SXRD) in an oxygen pressure range of 10~(-6)—100 mbar at temperatures from 575 to 875 K, in combination with density functional theory calculations. Depending on the partial pressure and temperature, the formation of a series of oxide phases is observed. At a sample temperature of 575 K, a single O—Ir—O trilayer forms at oxygen pressures of 10~(-3) to 1 mbar, which grows into a hexagonal multilayer surface oxide at pressure of 100 mbar. Both surface oxides are only kinetically stabilized structures according to DFT calculations. The multilayer surface oxide is kinetically very stable against decomposition in vacuum and further oxidation at low temperature of 575 K as revealed by SXRD. At higher sample temperatures (775 and 875 K), O—Ir—O trilayers form at pressures around 1 mbar, whereas at a pressure of 100 mbar, bulklike rutile IrO2 grows with predominant orientations of (110) and (100) along the normal of Ir(111).
机译:在575〜875 K的温度下,在10〜(-6)-100 mbar的氧气压力下,通过原位表面X射线衍射(SXRD)研究了Ir(111)表面的氧化。理论计算。取决于分压和温度,观察到一系列氧化物相的形成。在575 K的样品温度下,在10〜(-3)至1 mbar的氧气压力下会形成一个单一的O-Ir-O三层,然后在100 mbar的压力下会成长为六边形多层表面氧化物。根据DFT计算,两种表面氧化物均为动力学稳定的结构。多层表面氧化物在动力学上非常稳定,可以防止在真空中分解以及在575 K的低温下进一步氧化,如SXRD所示。在较高的样品温度(775和875 K)下,在大约1 mbar的压力下会形成O-Ir-O三层,而在100 mbar的压力下,块状金红石型IrO2会沿着法线方向以(110)和(100)为主取向生长的Ir(111)。

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