Rare-earth zirconates with pyrochlore and fluorite structures have recently been identified as promising thermal barrier coating materials owing to their low thermal conductivities. In this study, six samples with the general formula (NdSmEuGd)_(1-x)/2Dy_2xZr₂O₇ were synthesized to further reduce the thermal conductivity. X-ray diffraction and Raman spectroscopy showed that the transition from an ordered pyrochlore to a disordered fluorite structure is due to cation and anion disorder. Transmission electron microscopy showed that anion disorder occurred before cation disorder. A modified mass disorder parameter was introduced into this system, which can describe the change in thermal conductivity well. This parameter can be a basis for designing more complex materials with lower thermal conductivities.

具有烧绿石和萤石结构的稀土锆酸盐最近被确定为有前途的热障涂层材料，因为它们具有低导热性。在本研究中，六个具有通式 (NdSmEuGd) _{(1- x )/2} Dy _{2 x} Zr ₂ O _7的样品被合成以进一步降低热导率。X 射线衍射和拉曼光谱表明，从有序烧绿石到无序萤石结构的转变是由于阳离子和阴离子无序造成的。透射电镜显示阴离子紊乱先于阳离子紊乱发生。该系统引入了改进的质量无序参数，可以很好地描述热导率的变化。该参数可以作为设计具有较低热导率的更复杂材料的基础。