Electron Spin Resonance in Neutron-irradiated Polycrystalline Beryllium Oxide

Troup, G. J.; Thyer, J. R.

doi:10.1088/0370-1328/79/2/322

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…Some previous EPR work on neutronirradiated polycrystalline samples has been reported by Troup and Thyer. 8 They report an EPR line with gu= 2.0036 and g L = 2.0110 and an over-all linewidth of 30 G, although the change of line shape upon annealing leads them to conclude that the line may come from more than one kind of center.…”

Section: E Lectron-paramagnetic-resonancementioning

confidence: 99%

Electron Paramagnetic and Nuclear Double Resonance ofF+Centers in BeO Single Crystals

1969

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Single crystals of BeO which have been irradiated with neutrons show an EPR spectrum with partially resolved hyperfine structure. An ENDOR study of the hyperfine interaction leads to the conclusion that the spectrum arises from centers which consist of an electron trapped at an oxygen vacancy surrounded by four Be nuclei. The measured hyperfine interaction constants are: Ai/h= 10.3 MHz, A u/h= 16.4 MHz, and (e 2 qQ)/h= 1.1 MHz for the Be nuclei not on the c axis; and Ai/h = 4.2 MUz,A u /h = 9.2 MHz, and (e 2 qQ)/ h= 1.5 MHz for the nuclei along the c axis. These values lead to |^(fBe) | 2 =0.13X10 24 cm" 3 for the electron wave function at the c-axis nuclei, and |^(rBe) | 2 =0.06X10 24 cm -3 for the nonaxial nuclei. The measured g value for H parallel to the c axis is 2.0030.

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Section: E Lectron-paramagnetic-resonancementioning

confidence: 99%

Electron Paramagnetic and Nuclear Double Resonance ofF+Centers in BeO Single Crystals

1969

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Radiation-induced heterogeneous reactions in BeO + H2O using EPR

Гарибов¹,

Gezalov²,

Kasumov³

et al. 1987

International Journal of Radiation Applications and Instrumenta

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Electron Spin Resonance of Boron in Single—Crystal BeO

Reinberg

1964

The Journal of Chemical Physics

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Single crystals of synthetic BeO which have been irradiated with 6-MeV electrons show an ESR spectrum at room temperature identified as being due to boron ions substituting for beryllium at normal lattice sites. The hyperfine tensor A is cylindrically symmetric with its principal axis pointing towards one of the near oxygen bonds. Six equivalent directions are observed corresponding to the positions of the nonaxial nearest-neighbor oxygen atoms. The constants of the spin Hamiltonian are: g∥ = 2.0035±0.0005, g⊥ = 2.0044±0.0005, A∥ = 122 Oe, A⊥ = 76.5 Oe. The spectrum is analyzed in terms of the paramagnetic electron occupying an antibonding orbital located along the direction of a B–O bond. Comparison of the observed hyperfine interaction with those expected for the free atom suggests deviations of the orbital from tetrahedral sp3 configuration to one in which the ratio of the p to s contribution increases from √3 to 2.64, implying that the B–O bond is lengthened along the direction in which the paramagnetic electron is stabilized, the bond angle decreasing from 109 to 105 deg.

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Electron Spin Resonance in Neutron-irradiated Polycrystalline Beryllium Oxide

Cited by 4 publications

References 10 publications

Electron Paramagnetic and Nuclear Double Resonance ofF+Centers in BeO Single Crystals

Electron Paramagnetic and Nuclear Double Resonance ofF+Centers in BeO Single Crystals

Radiation-induced heterogeneous reactions in BeO + H2O using EPR

Electron Spin Resonance of Boron in Single—Crystal BeO

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