The HfO₂-SmTaO₄ ceramics were prepared by solid state reaction at 1700 ℃. The XRD shows that HfO₂-SmTaO₄ ceramics belong to the monoclinic phase (the space group: I12/ (5)). The HfO₂-SmTaO₄ ceramics doped with 2 % and 4 % mol have a second phase, which is inferred to as Sm_0.33TaO₇. The solid solution mechanism of HfO₂-SmTaO₄ ceramics appears to be the replacement of Sm³⁺ ions with Hf⁴⁺ ions. The HfO₂-SmTaO₄ ceramics have a lower thermal conductivity (1.50 W m⁻¹ K⁻¹ at 800 ℃) than 7–8-YSZ, with a minimum nearly 30 % lower than YSZ. The low thermal conductivity is attributed to the substitution of Sm³⁺ ions with an equal number of Hf⁴⁺ ions; the resulting oxygen vacancy and point defect enhances phonon scattering, reducing the thermal conductivity of HfO₂-SmTaO₄ ceramics. The thermal conductivity decreases as the doping of the HfO₂ is increased, and the experimental and calculated values tend to be similar. The outstanding thermophysical properties indicate that HfO₂-SmTaO₄ ceramics are potential TBCs.

在1700℃下固相反应制备出HfO ₂ -SmTaO ₄陶瓷。X射线衍射表明，HfO ₂ -SmTaO ₄陶瓷属于单斜晶相（空间群：I12 /（5））。掺杂有2％和4％mol的HfO ₂ -SmTaO ₄陶瓷具有第二相，可以推断为Sm _0.33 TaO ₇。HfO ₂ -SmTaO ₄陶瓷的固溶机理似乎是用Hf ⁴⁺离子代替Sm ³⁺离子。HfO ₂ -SmTaO ₄陶瓷的导热系数较低（1.50 W m ^-1K ^-1在800℃）比7–8-YSZ低，至少比YSZ低30％。低热导率归因于用相等数量的Hf ⁴⁺离子替代Sm ³⁺离子；所产生的氧空位和点缺陷增强了声子的散射，降低了HfO ₂ -SmTaO ₄陶瓷的热导率。随着HfO ₂掺杂的增加，热导率降低，并且实验值和计算值趋于相似。出色的热物理性质表明，HfO ₂ -SmTaO ₄陶瓷是潜在的TBC。