通过固相反应法合成一系列插层化合物Pd_xNbSe₂ (x=0~0.17)。它们与2H-NbSe₂相同, 属于六方晶格, 空间群为P6₃/mmc。Pd占据NbSe₂层间的八面体空位。随着Pd含量的增加, 晶格常数c线性增大, 而a几乎不变。X射线单晶衍射结果表明, Pd_0.17NbSe₂的晶格常数为a=b=0.34611(2) nm, c=1.27004(11) nm。每个Pd原子与六个Se原子键合形成[PdSe₆]八面体来连接相邻的Nb-Se层, 使晶体结构变得更加稳定, 从而提高化合物的热稳定性。电学测试表明, 随着Pd含量的增加, Pd_xNbSe₂的剩余电阻比减小。此外, 超导转变温度也随着Pd含量的增加而下降, 说明Pd的引入不利于NbSe₂的超导态。

New intercalated compounds Pd_xNbSe₂ (x=0-0.17) were synthesized via solid-state reaction. They possess the parent structure of 2H-NbSe₂ and crystalize in the hexagonal space group of P6₃/mmc. The intercalated Pd occupies the octahedral position in the van der Waals gaps of 2H-NbSe₂. Unit cell parameter c increases linearly with the Pd content, while a is nearly unchanged. The lattice parameter of Pd_0.17NbSe₂ (a=b=0.34611(2) nm, c= 1.27004(11) nm) is identified by single crystal X-ray diffraction. The intercalated Pd stabilizes the crystal structure of NbSe₂ by connecting the adjacent Nb-Se layers with [PdSe₆] octahedra and leads to the enhanced thermostability in air. Temperature dependence of electric resistivity reveals that the residual resistivity ratio of Pd_xNbSe₂ monotonically decreases with addition of the intercalated Pd content. The decreased superconducting critical temperature of Pd_xNbSe₂ indicates the suppression effect of Pd intercalation on the superconductivity in the host NbSe₂.