Preparation of Mg particles were carried out by using a pulsed wire discharge method, which is a physical vapor method in organic matter fume/vapor and is beneficial for passivated metal nanosized powders. From results of powder X-ray diffraction, the sample consisted of single-phase Mg. Electron diffraction and transmission electron microscopy observations revealed that Mg submicron particles were seen even though the presence of fine MgO particles. After an oxidation test at room temperature in air for one month, the oxidation did not progress. From these results, it was concluded that alkaline earth metal particles can be mass-produced by the pulsed wire discharge.

Pyrochlore Ce₂Zr₂O₇ was found in the experiment which changed Ce for Ba in BaZrO₃ in 1955. The pyrochlore structure is a reduced structure in which all Ce ions have triply oxidized state. κCe₂Zr₂O₈ was found in 1995, which is an oxidized structure in which all Ce ions is in the oxidation state +4. These cation ordered structure, pyrochlore and κ phases ceria zirconia complex oxide have extremely high oxygen storage and release rate comparing to CeZrO₂ with cation-random arrangement structure. This review shows the history of discovery and recent application of them.

The decontamination of Cs in rice fields is necessary for the continuation of agriculture in the Fukushima prefecture. A composite material consisting of the Na-P1 type zeolite and magnetite was synthesized from the fly-ash and iron chlorides, because the magnetic collection was possible using this composite material after radioactive Cs⁺ ion adsorption. The existence of nano-sized magnetites in the polycrystalline zeolite (several micrometers) was confirmed by SEM and TEM observations. By mixing soil with the magnetized Na-P1, with the mass ratio of 10:1, in ammonium oxalate solution for 10 min, more than 80% of radioactive Cs was removed from soil. The composite powder material consisting of mordenite and nano-sized magnetite was also synthesized from a mixed slurry of the diatomite and nano-sized magnetite.