Electron paramagnetic resonance of the radiation centers in quartz

Solntsev, V. P.; Mashkovtsev, R. I.; Shcherbakova, M. Ya.

doi:10.1007/bf00745298

Cited by 20 publications

(6 citation statements)

References 12 publications

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“…γ-irradiation of neutron-irradiated quartz samples at liquid-nitrogen temperature induced the E centers with S = 1 [3]. Triplet states of E centers are the result of interactions between two neighboring E centers.…”

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EPR study of new E′ centers in neutron-irradiated α-quartz

Mashkovtsev

Pan

2018

EPL

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Electron paramagnetic resonance (EPR) of defects in neutron-irradiated natural α-quartz exposed to doses from 10 16 to 10 20 n/cm 2 has been studied. New E centers and other defects have been revealed. The intensities of hole-like defects, including a novel triplet-state H 1 center, and E -type centers in relation to neutron fluencies and post-irradiation annealing temperature have been investigated. For the new E 13 center the primary spin Hamiltonian parameter matrices g and A( 29 Si) (hyperfine interaction for 29 Si) as well as the radiation dose dependence and thermal stability have been determined.

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“…Fast neutrons produced a number of other paramagnetic defects for which spin Hamiltonian parameters have not been determined [3,5,6]. Among them only some hole-like paramagnetic defects associated with silicon vacancies have been fully investigated [19,20].…”

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EPR study of new E′ centers in neutron-irradiated α-quartz

Mashkovtsev

Pan

2018

EPL

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“…From the very beginning the point defects in quartz samples were effectively produced with neutron fluxes [6,15]. Later it was shown that besides E 1,2 centers, fast neutrons produced a number of other defects for which spin Hamiltonian parameters have not been determined [16,17]. In ancient flints and natural quartz grains additional E -type EPR signals were observed at g ≈ 2 but could not be identified with any reported E centers [18,19].…”

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New E′ centers in neutron-irradiated α -quartz

Mashkovtsev

Pan

2016

EPL

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PACS 42.70.Ce -Glasses, quartz PACS 61.72.jd -Defects and impurities in crystals; microstructure Vacancies PACS 61.72.J--Points defects and defect clusters Abstract -Several E -type defects have been revealed in neutron-irradiated natural and synthetic α-quartz by using electron paramagnetic resonance (EPR) spectroscopy. For the known E 2 center the primary spin Hamiltonian parameter matrices g and A( 29 Si) (hyperfine interaction with 29 Si) have been refined and provide compelling evidence for spin trapping on the long-bond Si atom. The EPR spectra of the new E 11 center demonstrate that the super-hyperfine structure arises from the interaction with 27 Al, the first-ever example of Al-associated E centers in crystalline quartz. The matrices g and A( 29 Si) of E 11 and another new center (E 12 ) support the forwardoriented configuration proposed for the E α center in amorphous silica.

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“…Unfortunately, in spite of numerous ESR studies of Cu 2+ species in tetrahedral or another surrounding of oxygen atoms, presented in refs − , no data of the hyperfine interaction between Cu 2+ and fluorine atoms 19 F are available in literature, so far: Zaripov et al did not manage to completely decipher the ESR spectrum of Cu 2+ in CaF 2 . ESR spectra of Cu 2+ ions in α-quartz and beryl were described in our earlier works. − …”

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Optical and Magnetic Properties of Cu-Containing Borates with “Antizeolite” Structure

et al. 2019

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Crystals of copper-doped barium fluoride borate solid solutions Ba 3 (BO 3 ) 2−x F 3x :Cu were grown from hightemperature solution. Using X-ray single-crystal diffraction, the structure was solved and refined in Pbam space group. These crystals are colored in brown, revealing linear dichroism. Optical and electron spin resonance spectroscopic investigations concluded that the light absorption of Ba 3 (BO 3 ) 2−x F 3x :Cu crystals is caused by both the exciton and f ree charge carriers. This phenomenon is similar to those observed in other colored "antizeolites" built with the positively charged framework of porous [Ba 12 (BO 3 ) 6 ] 6+ building blocks (hence named as antizeolites). The coloring of Ba 3 (BO 3 ) 2−x F 3x :Cu crystals is associated with the absorption of Cu 2+ ions as well. For the first time, constants of the hyperfine interaction of copper ions Cu 2+ in octahedral fluorine surroundings [CuF 6 ] 4− have been determined.

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Electron paramagnetic resonance of the radiation centers in quartz

Cited by 20 publications

References 12 publications

EPR study of new E′ centers in neutron-irradiated α-quartz

EPR study of new E′ centers in neutron-irradiated α-quartz

New E′ centers in neutron-irradiated α -quartz

Optical and Magnetic Properties of Cu-Containing Borates with “Antizeolite” Structure

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