Transport properties of zirconium alloy oxide films

Frank, H. P.

doi:10.1016/s0022-3115(02)00879-6

Cited by 11 publications

(12 citation statements)

References 16 publications

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“…It can be practiced by adding a metal of lesser valence than zirconium [8]. Such the addition stabilizes a high-temperature cubic phase of zirconia as the solid electrolyte with electronic conductivity practically equal to zero [13,25]. For yttrium-stabilized zirconia (YSZ) at its addition of 9 mol%, there is no positive effect because the band gap is the same (∼4.0 eV) and the molar density of electrons in the oxide scale is in the same range of 10 21 to 10 10 mol À1 (see above) at 650 K but the molar density of oxygen vacancies is very high ∼10 22 mol À1 [26].…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…However, the electronic conductivity in ZrO 2Àx film exceeds the anionic one which allows oxidizing of zirconium by oxygen anions diffusing over zirconia vacancies [13].…”

Section: Electrons In Zro 2àxmentioning

confidence: 99%

“…1/2 which is less than 10 nm [13]. The investigation of DPOS on zirconium cladding by analytic tools [2,3] has disclosed ZrO phase between metal and ZrO 2Àx layer at the initial oxidation of zirconium alloys by the aqueous coolant.…”

Section: The Location Of Black Zirconmentioning

confidence: 99%

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A role of electrons in zirconium oxidation

Alekseev

Shimkevich

2017

EPJ Nuclear Sci. Technol.

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Abstract. Growing the oxide scale on the zirconium cladding of fuel elements in pressured-water reactors (PWR) is caused by the current of oxygen anions off the waterside to the metal through the layer of zirconia and by the strictly equal inverse electronic current. This process periodically speeds up the corrosion of the zirconium cladding in the aqueous coolant due to the breakaway of the dense part of oxide scale when its thickness reaches 2 mkm. It is shown that the electronic resistivity of zirconia is not limiting the zirconium oxidation at working temperatures. For gaining this limitation, a metal of lesser valence than zirconium has to be added to this oxide scale up to 15%. Then, oxygen vacancies arise in the complex zirconia, increase its band-gap, and thus, sharply decrease the electronic conductivity and form the solid oxide electrolyte whose growth is inhibited in contact with water at working temperatures of PWR.

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Section: Discussion Of Resultsmentioning

confidence: 99%

“…However, the electronic conductivity in ZrO 2Àx film exceeds the anionic one which allows oxidizing of zirconium by oxygen anions diffusing over zirconia vacancies [13].…”

Section: Electrons In Zro 2àxmentioning

confidence: 99%

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A role of electrons in zirconium oxidation

Alekseev

Shimkevich

2017

EPJ Nuclear Sci. Technol.

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“…The results presented in this paper were achieved continuing the investigation of the transport properties of oxide layers of zirconium alloys described earlier [1]. Of special interest were three specimens [2] of oxide films on Zr1Nb, ZrSnNb(Fe) and IMP Zry-4 tubes, used for fuel cladding in light water reactors, which had been grown at VVER conditions in water of 360°C for 1554 days (4 1 4 years).…”

Section: Introductionmentioning

confidence: 99%

“…Of special interest were three specimens [2] of oxide films on Zr1Nb, ZrSnNb(Fe) and IMP Zry-4 tubes, used for fuel cladding in light water reactors, which had been grown at VVER conditions in water of 360°C for 1554 days (4 1 4 years). The task was to compare the resistivity and the permittivity of the oxides grown under identical conditions on different alloys and test their stability at higher temperature by long-time annealing in air.…”

Section: Introductionmentioning

confidence: 99%