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首页> 外文会议>NATO Advanced Research Workshop on Defects and Surface-Induced Effects in Advanced Perovskites Jurmala, Latvia 23-25 August 1999 >New Approach for Boundary Conditions: space Charge Controlled Concentrations of CAtion Vacancies in Donor Doped SrTiO_3 for Short Diffusion Length
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New Approach for Boundary Conditions: space Charge Controlled Concentrations of CAtion Vacancies in Donor Doped SrTiO_3 for Short Diffusion Length

机译：边界条件的新方法：供体掺杂的SrTiO_3中短扩散长度的阳离子空位的空间电荷控制浓度

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摘要

Theoretical investigations on the stoichiometry of the surface based on the point defect model are presented. After a change in the partial pressure from reducing to oxidizing atmospheres, donor doped SrTiO_3 increases its resistivity by the formation of strontium vacancies at the gas solid itnerface. During the formation process, electrons are trapped by cation vacancies to satisfy the global electroneutrality condition. The equilibration of the concentration gradients of electrons and ionic vacancies is assumed to be diffusion controlled. While the high mobility of electrons forces a fast diffusion from the bulk to the surface, the slowest counterpart (ionic specimen) still remains in the near-surface region. Hence, the local electroneutrality condition is not satisfied, but a space charge region establishes. We prestn a model to describe the effect of this space charge region interacting with the build-in reaction at the surface. Unlike earlier publications, the surface concentrations of electrons and strontium vacancies are calculated to differ significnatly from the equilibrium state. We propose this mechanism to be a reasonable explanation for fast sensor responses.
机译：提出了基于点缺陷模型的表面化学计量的理论研究。在分压从还原气氛变为氧化气氛后，施主掺杂的SrTiO_3通过在气固界面处形成锶空位来提高其电阻率。在形成过程中，电子被阳离子空位俘获，以满足整体电子中性条件。电子和离子空位的浓度梯度的平衡被认为是受扩散控制的。尽管电子的高迁移率迫使从主体快速扩散到表面，但最慢的对应物（离子样本）仍保留在近表面区域。因此，不满足局部电子中性条件，但是建立了空间电荷区域。我们假装一个模型来描述该空间电荷区域与表面上的内置反应相互作用的影响。与早期出版物不同，电子和锶空位的表面浓度经计算与平衡态有显着差异。我们提出这种机制是对快速传感器响应的合理解释。

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