Optical Absorption Edge of Uranium Trioxide Phases: Part I

Khilla, M. A.; Rofail, N.H.

doi:10.1524/ract.1986.40.3.155

Cited by 5 publications

(8 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[91]) and very close to the band-gap energy of 2.61 eV determined in Ref. [92] for α-UO 3 , the α-phase of uranium trioxide, a "non-traditional" semiconducting material. Note that in this case, the Lorentz function worked better than Gaussian one in fitting the broad sub-band feature below band-gap E g .…”

Section: Parameterization Of the Uo X Compounds Dielectric Function Nsupporting

confidence: 84%

Modified Tauc–Lorentz dispersion model leading to a more accurate representation of absorption features below the bandgap

2015

View full text Add to dashboard Cite

Section: Parameterization Of the Uo X Compounds Dielectric Function Nsupporting

confidence: 84%

Modified Tauc–Lorentz dispersion model leading to a more accurate representation of absorption features below the bandgap

2015

View full text Add to dashboard Cite

“…The different phases of U0 3 (α, β, γ, δ, s) and amorphous U0 3 (A) were prepared and identified by X-ray pattern, also the O/U ratios were determined as described before [17,18]. The samples were cold-pressed in the form of discs (at 2 ton/cm 2 ) of 12 mm diameter and 2.3 mm thick without using any binder.…”

Section: Methodsmentioning

confidence: 99%

“…In a previous publication [17], the optical gap width A E g have been measured for the different six phases of U0 3 at room temperature ( Table 1). The change of AE g from one phase to other may be due to the variation of the crystal structure of the different phases and/or the oxygen deficiency.…”

Section: Different Concentration Of Imperfections and Im-mentioning

confidence: 99%

The Electrical Conductivity of the Different Uranium Trioxide "UO₃" Phases

Hanafi¹,

Ismail²,

Khilla³

et al. 1990

Radiochimica Acta

Self Cite

View full text Add to dashboard Cite

U0 3 / Electrical conductivity/ U0 3 modifications / Activation energy SummaryThe crystalline U0 3 phases α, β, y, δ, ε as well as an amorphous sample were prepared. The electrical conductivity was measured from 25 up to ~480°C for the different phases of U0 3 in air. The variation of conductivity at constant temperature from phase to phase was related to the variation of crystal structure and lattice defects. Generally, the conductivity showed a positive temperature coefficient. The intrinsic energy gap Δ E was found to be 2.52 or 2.68 eV for different investigated samples. The temperature range of intrinsic region depended on the nature of the phases. The decomposition temperature of the U0 3 samples was reflected on the conductivity curve as hump, peak or plateau.

show abstract

“…For the purpose of description, the low energy side of the curve represents the absorption of the Compound followed by the low energy side of the absorption edge. The energy gap for the transition giving rise to the edge is taken to be at the midway between its value on either sides of the edge as discussed before [13]. …”

Section: The Energy Gap {Eg) Value Of Ammonium Uranatementioning

confidence: 99%

“…The Xray analysis proved that the impurities in the unwashed samples when calcined at 500 °C hindered the formation ofpureß-U03 [11,12,18]. The value 2.175 eV corresponding to Eg of ß-UOs [13] is obtained in case of samples A and C after being washed and calcined at 500°C.…”

Section: The Energy Gap {Eg) Value Of Ammonium Uranatementioning

confidence: 99%