On the oxidation behavior of (Zr,Nb)2Fe under simulated nuclear reactor conditions

Abstract

The corrosion behavior of Zr alloys was affected by second phases, especially by those containing Fe and Nb. Ti 2 Ni-type (Zr,Nb) 2 Fe compound was melted and exposed to H 2 O 2 water solution at 320 °C and 16.4 MPa for 60 hours. The oxide layer was analyzed by X-ray diffraction and high-resolution transmission electron microscope (HRTEM). The formation of nano-crystalline tetragonal ZrO 2 (Fe-rich area) and amorphous ZrO 2 (Fe-deficient area) was observed. HRTEM analysis identified α-Fe could stabilize tetragonal ZrO 2 due to the epitaxial growth.ZrxFeyNb alloys with different iron were melted and corroded similarly. The result was consistent with the proposed mechanism.

Understanding the role of Fe, Cr and Ni in Zircaloy-2 with special focus on the role of Ni on hydrogen pickup

“…Elevated concentrations of Fe have been recorded at grain boundaries in the metal, which can continue into the oxide for at least 70 nm [20], therefore a similar distribution may be expected throughout the protective layer of the oxide. α-Fe has also been observed in corroded Zr intermetallic samples and shown to have the ability to stabilise tetragonal ZrO 2 [21]. The corrosion resistant properties of Fe has also been demonstrated in Zr(Fe,Nb) 2 in the C14 Laves phase, where it is suggested that the charge diversity of Fe promotes the formation of a layered oxide structure, within which the Fe-deficient layers provide a barrier for oxygen transport [22].…”

In situ coupling of Ti2O with rutile TiO2 as a core–shell structure and its photocatalysis performance

“…It should be noted that the acceptable error margin for XPS should be within 0.2 eV. 20 As shown in Fig. 6, the different treatments did not generate a reduced state of Ti.…”

Growth of NiCo<SUB align="right">2O<SUB align="right">4 nanotubes @MnO<SUB align="right">2 sheet core-shell arrays on 3D hierarchical porous carbon aerogels as superior electrodes for supercapacitors

“…The crystal phase of the NiCo 2 O 4 @MnO 2 structure was analysed by X-ray diffraction analysis (XRD), as shown in Figure 2. For the XRD pattern of NiCo 2 O 4 @MnO 2 , the broad and weak peaks indicated a poor crystallinity (Hu et al, 2016a(Hu et al, , 2016c. For the XRD pattern of NiCo 2 O 4 @MnO 2 , several characteristic peaks of 36.7°, 44.6° and 64.9°correspond to the respective (311), (400) and (440) planes, which can be well indexed to the spinel NiCo 2 O 4 phase (JCPDF card no.…”