A series of novel mixed oxides with honeycomb layered structure viz. delafossite-type Na₃M₂SbO₆ (where M = Cu; Ni; Cu, Ni; Cu, Ni, Co; Cu, Ni Co, Fe; Cu, Ni Co, Fe, Mn) were synthesized by a facile method. The synthesis involved heating of the metal precursors at 1100 °C followed by air quenching. The structure was analogous to that of Na₃Ni₂SbO₆ (space group: C2/m). The effect of increased entropy on the Jahn-Teller distortion effect, as previously reported in M = Cu system, was evident from the X-ray diffraction (XRD)/Rietveld structural analysis. The as-synthesized oxides showed photocatalytic activity as confirmed by the degradation of methylene blue. This was correlated to a drop in the optical band-gap from 2.41 to 1.96 eV on increasing the number of elements as well as its effect on the band energies are proposed here.

一系列具有蜂窝状层状结构的新型混合氧化物。通过简便的方法合成了铜铁矿型Na ₃ M ₂ SbO ₆（其中M = Cu; Ni; Cu，Ni; Cu，Ni，Co; Cu，Ni Co，Fe; Cu，Ni Co，Fe，Mn）。合成过程包括在1100°C下加热金属前驱体，然后进行空气淬火。结构类似于Na ₃ Ni ₂ SbO ₆（空间群：C2 / m））。如先前在M = Cu系统中报道的，熵增加对Jahn-Teller畸变效应的影响从X射线衍射（XRD）/ Rietveld结构分析中可以明显看出。合成后的氧化物显示出光催化活性，这可以通过亚甲基蓝的降解来确认。这与增加元素数量以及将其对带能量的影响建议在光学带隙从2.41降至1.96 eV有关。