Mechanisms of Reactions in the Solid State: (110) Al2O3 + (001) ZnO Interfacial Reaction
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- 作者：Sonia Pin ; Mark A. Newton ; Francesco D鈥橝capito ; Michele Zema ; Serena C. Tarantino ; Giorgio Spinolo ; Roger A. De Souza ; Manfred Martin ; Paolo Ghigna
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：January 12, 2012
- 年：2012
- 卷：116
- 期：1
- 页码：980-986
- 全文大小：458K
- 年卷期：v.116,no.1(January 12, 2012)
- ISSN：1932-7455
文摘
The mechanisms of the (110) Al2O3 + (001) ZnO interfacial reaction, that eventually yields the spinel ZnAl2O4, has been studied using a multitechnique approach involving local- and long-range structural probes (EXAFS, 渭-XANES, and XRPD) and a surface analytical probe such as SIMS. It is demonstrated that the reaction involves a series of different steps, where at least two different nonequilibrium compounds are formed and then transformed into the spinel. One of these compounds, playing a role similar to reactive intermediates in solution chemistry, has been trapped. To the best of our knowledge, this is the first time that such a kind of behavior has been demonstrated for a heterogeneous solid state reaction. It is argued that the critical step is a concerted, homogeneous movement of a set of atoms, rather than long-range diffusion. The implications of these findings for the fabrication of ceramic and nanoscale materials are discussed.