Synthese and advanced features of new homologous layered carbides

我们首次制备了新的同质层状碳化物和氧碳氮化物，用X射线衍射法和透射电子显微镜相结合的方法测定了它们的晶体结构。其通式为(MC)_1T_&lt；4m+3n&gt；C_&lt；3m+2n&gt；(M=Zr，Y，Hf，T=Al，Si，Ge)和(Al，Si)_&lt；41+m&gt；(0，C，N)_&lt；31+m&gt；前者的晶体结构表现为导电层和绝缘层的交替堆积。我们提出了设计和加速合成具有极高性能的新型n型热电转换材料的先进方法。

We have for the first time prepared new homologous layered carbides and oxycarbonitrides to determine their crystal structures by the combined use of X-ray diffractometry and transmission electron microscopy. Their general formulas are expressed by(MC)_1 T_<4m+ 3n> C_<3m+ 2n>(M=Zr, Y, Hf, T=Al, Si, Ge) and(Al, Si)_<41+ m>(0, C, N)_<31+ m>. The crystal structures of the former compounds are characterized by the alternative stacking of the electric conductive[MC] layer and the insulative[T_<4m+ 3n> C_<3m+ 2n>] layer. We have proposed the advanced method to design and expedite the synthesis of the new n-type thermoelectric conversion materials with extreme properties.