approximately 160 K, which results from a structural phase transition, clarified by X-ray single crystal diffractometer data. The phase transition originates from out of plane distortions of the palladium atoms, which show structural order around 160 K. Specificheat measurements and temperature dependent magnetic susceptibility data (including lowfield measurements) do not show any corresponding anomaly
由稀土(RE)元素,合适的稀土氧化物,砷和钯海绵在1223 K的最高退火温度下合成了新的四价砷化钯钯氧化物Nd 10 Pd 3 As 8 O 10和Sm 10 Pd 3 As 8 O 10。从X射线单晶衍射仪数据在不同温度下精制了钕化合物的结构。根据吉尼尔(Guinier)粉末衍射发现化合物是同型的。两种化合物都是同型的,具有Nd 10 Au 3 As 8 O 10并由堆叠的正式聚阳离子[RE 10 O 10 ] 10+和聚阴离子[Pd 3(As 2)4 ] 10-层组成。与众所周知的具有基本离子键的四面体配位稀土氧化物层相反,砷化钯层表现出相当共价的特征,XPS数据突出了这一点。电阻率测量表明Nd 10 Pd 3 As 8 O 10的半导体性质并且还显示了在大约160 K处的异常,这是由结构相变导致的,通过X射线单晶衍射仪数据得到了证实。相变源自钯原子的平面外畸变,其在160 K附近显示