Low Thermal Conductivity of SnO2‐Doped Y2O3‐Stabilized ZrO2: Effect of the Lattice Tetragonal Distortion
Low Thermal Conductivity of SnO2‐Doped Y2O3‐Stabilized ZrO2: Effect of the Lattice Tetragonal Distortion
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DOI：
10.1111/jace.13313
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发表时间：
2015
影响因子：
3.9
通讯作者：
Mengqiang Zhao;X. Ren;W. Pan
中科院分区：
文献类型：
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作者：
Mengqiang Zhao;X. Ren;W. Pan
考虑到声子散射效应和氧化钛的稳定性，Sn4+离子被认为是一种合适的掺杂剂，可以实现氧化钇稳定的氧化锆热障涂层的隔热性能和耐久性能的最佳结合。在本研究中，观察到了一系列SnO2掺杂的Y2O3稳定的ZrO2化合物的异常晶格膨胀和强烈的结构无序性，这是由于氧配位的四方扭曲造成的。声子散射主要是由于Sn4+取代的结构无序而不是点缺陷导致的，从而降低了导热系数。然而，当掺杂含量较高时，样品的热学性能恶化，这可能是由于测量过程中的t-m相变所致。考虑到结构稳定性和热学性能，SnO2掺杂的Y2O3稳定的ZrO2化合物有望成为热障涂层材料的候选材料。
Considering the phonon scattering effect and the stability of t′ zirconia, Sn4+ ion is recognized as an appropriate dopant to achieve the best combination of thermal insulating capability and durability of yttria-stabilized zirconia thermal barrier coatings (TBCs). In this research, unusual lattice expansion and strong structural disordering were observed in a series of SnO2-doped Y2O3-stabilized ZrO2 compounds, which are caused by the tetragonal distortion of oxygen coordination. Phonon scattering due to the structural disordering rather than point defects of Sn4+ substitutions predominates in reducing the thermal conductivity. However, deterioration of the thermal properties was observed at high doping content, which may be attributed to the t-m phase transformation during the measurements. Considering the structure stability and thermal properties, SnO2-doped Y2O3-stabilized ZrO2 compounds can be promising candidates for TBCs.