Thermodynamic behavior of^ (57)Fe implanted into ZrO_2(Y)by CEMS and slow positron beam

Ｔｈｅｒｍｏｄｙｎａｍｉｃｂｅｈａｖｉｏｒｏｆ^（５７）ＦｅｉｍｐｌａｎｔｅｄｉｎｔｏＺｒＯ_２（Ｙ）ｂｙＣＥＭＳａｎｄｓｌｏｗｐｏｓｉｔｒｏｎ ｂｅａｍＺｈａｎｇＧｕｉ－Ｌｉｎ（张桂林），（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＮｕｃｌｅａｒＲｅｓｅ...

Using conversion electron spectroscopy(CEMS) and slow positron beam, the chemical state of 57Fe(100keV,3×1016 cm-2) implanted into ZrO2 containing 0.03 mole fraction Y2O3(ZY3) and its thermodynamic behavior during annealing process at 200 ￣ 500℃ are studied.For as-implanted sample, Fe chemical states of Fe0,Fe2+ and Fe3+ are observed,and assigned to the superparamagnetic metallic iron cluster,iron dimer(and trimer) and complex of the Fe3+ associated with canon vacancy (V) and oxygens respectively.After annealing at 400℃ the complexes of Fe3+-V are mostly dissolved,and the prior phase to α-Fe and α-Fe nano-crystalline cluster are present in the sample.Meanwhile the mixed conducting of oxygen-ions and electrons in the ZY3 sample containing Fe appears,it may correlate with the different iron charge states and their relative amounts,in particular with the α-Fe nano-granule.