Raman spectroscopy of plutonium dioxide and related materials

Sarsfield, Mark J.; Taylor, Raymond L.; Puxley, Christopher; Steele, Helen

doi:10.1016/j.jnucmat.2012.04.034

Cited by 69 publications

(72 citation statements)

References 60 publications

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“…The last was attributed in the case of uranium oxides to a U 4 O 9 phase [21]. Part II and III show peaks which were also observed by Sarsfield et al for pure PuO 2 [22]. Both peaks (''II'' and ''III'') change position and become weaker with increasing ThO 2 content.…”

Section: Raman Spectroscopysupporting

confidence: 63%

“…Sarsfield et al [22] extensively discussed the origin of these peaks, ruling out interactions with the surrounding atmosphere and material, and suggesting an electronic origin with energies of about (262 and 324) meV respectively. The nearly constant ratio observed at different compositions between the T 2g and the higher energy peaks (see table 2) tempt one to see a relationship between these modes.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…The deviation of the most abundant phase after melting is assumed as a worst-case uncertainty source for the solidification temperature in figure 2, resulting in error bars towards the ThO 2 side of the phase diagram. (ii) Defect formation due to age would increase the lattice parameter [22]. Additionally, more defects due to other origin than a self-irradiation may be introduced at higher temperature and quenched to room temperature.…”

Section: Powder X-ray Diffractionmentioning

confidence: 99%

See 2 more Smart Citations

High temperature phase transition of mixed (PuO 2 + ThO 2 ) investigated by laser melting

Böhler

Cakir

Beneš

et al. 2015

The Journal of Chemical Thermodynamics

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a b s t r a c tA laser heating approach combined with fast pyrometry in a thermal arrest method was used to provide new data for the melting/solidification phase transition in mixed (PuO 2 + ThO 2 ) at high temperature. At low concentration of ThO 2 in PuO 2 a minimum in the solidification temperature in the pseudo binary (PuO 2 + ThO 2 ) was observed. The minimum was found around a composition with 5 mol% ThO 2 . Phase transition temperatures of other compositions are closer to an ideal solution behaviour. To detect changes in the material a complete investigation with electron microscopy, Raman spectroscopy and powder X-ray diffraction was done. Raman vibration modes were found, that are characteristic for materials containing PuO 2 , and high temperature segregation effects during solidification were described. The results obtained in the present work are compared to other mixed actinide dioxides and compared to the ideal solution case for this system. The presented results show the importance of the hightemperature oxygen chemistry in this actinide oxide phase.

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Section: Raman Spectroscopysupporting

confidence: 63%

Section: Raman Spectroscopymentioning

confidence: 99%

Section: Powder X-ray Diffractionmentioning

confidence: 99%

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High temperature phase transition of mixed (PuO 2 + ThO 2 ) investigated by laser melting

Böhler

Cakir

Beneš

et al. 2015

The Journal of Chemical Thermodynamics

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“…3. The peak location, which is at 463 cm −1 , is close to the Raman active lattice vibration for CeO 2 (465 cm −1 ) [16]. Fig.…”

Section: Microstructuresupporting

confidence: 60%

Mechanical properties of cerium and a cerium–5wt% lanthanum alloy by nanoindentation and ultrasonic velocity measurements

Wheeler

Zekonyte

Wood

2013

Materials Science and Engineering: A

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“…The intensity of 2LO band decreased by increasing oxygen content of the sample and was not observed for highly oxidized UO 2 samples. In addition, the resonance Raman effect is often observed when the laser excitation energy is comparable to the band gap energy . Taniguchi et al .…”

Section: Resultsmentioning

confidence: 99%

Raman and X‐ray Studies of Uranium–Lanthanum‐Mixed Oxides Before and After Air Oxidation

et al. 2015

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UO 2 samples doped with 6, 11, 22 mol% lanthanum were examined before and after air oxidation. To verify the formation of uranium-lanthanum-mixed oxide solid solutions, powder X-ray diffraction (XRD) analyses of the crystalline phases in the materials were carried out. The presence of oxygen vacancies in the La-doped UO 2 samples was identified by Raman spectrometry. It was evidenced by changes induced in the Raman spectra by air oxidation. This latter was carried out either by increasing the Raman laser power or by thermally treating the samples at 500 K for 370 h. In addition, oxidation behavior differences of pure and La-doped UO 2 samples were reported by comparing XRD and Raman results of the samples before and after air oxidation. It was shown that the concentration of the M 4 O 9 (M: U, La) phase increased with increasing content of La, whereas inhibition for the formation of M 3 O 8 phase was observed.

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Raman spectroscopy of plutonium dioxide and related materials

Cited by 69 publications

References 60 publications

High temperature phase transition of mixed (PuO 2 + ThO 2 ) investigated by laser melting

High temperature phase transition of mixed (PuO 2 + ThO 2 ) investigated by laser melting

Mechanical properties of cerium and a cerium–5wt% lanthanum alloy by nanoindentation and ultrasonic velocity measurements

Raman and X‐ray Studies of Uranium–Lanthanum‐Mixed Oxides Before and After Air Oxidation

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