Haeng Yu Ji, Lee Jong-Sook, Maier Joachim
Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany.
Phys Chem Chem Phys. 2005 Oct 21;7(20):3560-4. doi: 10.1039/b509164k. Epub 2005 Aug 26.
The thermodynamics of water incorporation into Fe-doped SrTiO(3) was investigated by thermogravimetric measurements. Changes in valence states of redox-active dopant ions (Fe(3+)/Fe(4+)) with water vapor pressure were taken into account in the defect chemical analysis. The proton solubility was significantly enhanced by the presence of the redox centers. The hydration enthalpies and entropies were -60 kJ mol(-1) and -122 J mol(-1) K(-1). The defect chemical model was applied to describe the water vapor dependence of the electrical conductivity in mixed ionic and electronic conducting Fe-doped SrTiO(3) single crystals.
通过热重测量研究了水掺入铁掺杂的钛酸锶（SrTiO₃）中的热力学。在缺陷化学分析中考虑了氧化还原活性掺杂离子（Fe³⁺/Fe⁴⁺）的价态随水蒸气压力的变化。氧化还原中心的存在显著提高了质子溶解度。水合焓和熵分别为-60 kJ mol⁻¹和-122 J mol⁻¹ K⁻¹。应用缺陷化学模型来描述混合离子和电子导电的铁掺杂钛酸锶单晶中电导率对水蒸气的依赖性。
