Electron paramagnetic resonance study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>in<i>α</i>-quartz: Hydrogen-compensated center

Mombourquette, Michael J.; Minge, J.; Hantehzadeh, Mohammad Reza; Weil, John A.; Halliburton, L. E.

doi:10.1103/physrevb.39.4004

Cited by 19 publications

(13 citation statements)

References 12 publications

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“…Fe2+). Electron paramagnetic resonance experiments have identi fied that Fe3+ occurs substitutionally at a Si4+ site, charge-compensated by an interstitial H ion (Mombourquette et a/., 1989). The emission associated with the defect is reported to peak at energies between -1.65-1.78 eV.…”

Section: T (T)mentioning

confidence: 99%

Cathodoluminescence microcharacterization of point defects in α-quartz

Stevens‐Kalceff

2009

Mineral. mag.

111

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Cathodoluminescence (CL) spectroscopy in an SEM has been used to investigate the point defect structure of clear natural a-quartz at 295 K. Cathodoluminescence processes and experimental factors that influence the CL spectra from a-quartz are investigated. Electron irradiation may induce changes in the average local crystal microstructure of quartz, locally transforming it to a less dense, amorphized state. The observed CL emissions are identified with a range of native and impurity defect centres including: interstitial molecular O at 0.968 eV; a charge-compensated substitutional Fe 3+ impurity centre at~1.65 eV; a non-bridging oxygen hole centre (NBOHC) at 1.9 eV; an NBOHC with OH À precursor at 1.95 eV; an NBOHC with a non-bridging impurity (e.g. Li + , Na + or K + ) precursor at 1.9 eV; a radiative recombination of the self-trapped exciton (STE) associated with an E' centre in electron-irradiation-amorphized quartz at 2.3 eV; a radiative recombination of the STE associated with the E 1 ' centre in a-quartz at 2.7 eV; a charge-compensated-substitutional Al3+ impurity centre at 3.3 eV; and a neutral relaxed O vacancy at 4.3 eV. In addition, unresolved contributions from O-deficient defects in electron-irradiation-amorphized SiO 2 are likely at~2.7 and 4.3 eV.

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Section: T (T)mentioning

confidence: 99%

Cathodoluminescence microcharacterization of point defects in α-quartz

Stevens‐Kalceff

2009

Mineral. mag.

111

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“…Studies of iron in quartz (SiO 2 ) have identified a number of Fe 3+ centres in complexes with lithium and hydrogen [28,29]. In [29] Mombourquette et al state in the summary that the evidence for Fe 3+ substituting for Si 4+ was conclusive.…”

Section: Discussionmentioning

confidence: 99%

The Electron Paramagnetic Resonance of Fe3+ Observed in Two Axial Sites in Synthetic Single Crystals of Zircon (ZrSiO4)

Ball

Wyk

2000

phys. stat. sol. (b)

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The electron paramagnetic resonance of synthetic zircon single crystals doped with iron is reported confirming the observations of two different spectra made in natural samples previously. The spin‐Hamiltonian parameters have been established by careful measurement of the angular variation of the two axial spectra at X‐band at room and nitrogen temperatures, and computer fitting the observed line positions with those calculated from diagonalising the appropriate spin‐Hamiltonian.

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“…Extensive continuous wave EPR (cwEPR) characterisations of Fe-bearing quartz single crystals, where the presence of the S2 centre has been assessed, are reported in [5], for natural samples, and in [2,4] for synthetic samples. Remarkably, these studies enlighted the occurrence of two S2 centres, one more abundant (the socalled S2(D), with the proton connected to the distant oxygen) than the other (the S2(C) centre, with the proton linked to the close oxygen).…”

Section: Experimental Strategy Of the Paramagnetic Resonance Measurementsmentioning

confidence: 99%

“…In those studies, similar sets of Hamiltonian parameters were proposed, including a modest to negligible Zeeman anisotropy and a very strong Zero-Field-Splitting interaction. [4] and [5] refined the component of the SHF tensor. [2,4] obtained a best fit also including higher-order terms in the ZFS interaction, whereas [5] excluded this necessity.…”

Section: Experimental Strategy Of the Paramagnetic Resonance Measurementsmentioning

confidence: 99%

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Characterisation of the Fe(III):H+ Defect Centre in Natural Amethyst

2020

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A natural single crystal of amethyst was investigated by means of continuous-wave and pulsed Electron Paramagnetic Resonance (EPR), with the aim of structurally characterizing the substitutional S2 Fe(III):H+ centre. In this centre, Fe(III) replaces Si(IV) in the tetrahedral site, whereas H+ is coupled to Fe(III) to maintain the charge balance. The spectroscopic investigations, mainly the interpretation of the Electron Spin Echo Envelope Modulation, allowed a detailed localisation of the proton to be obtained. H+ occurs in the channels crossing the crystal parallel to the crystallographic c axis, in a largely eccentric position. The Fe(III)-H+ distance, evaluated in 2.70 Å, is found associated with a non-negligible isotropic hyperfine coupling, which can be linked to the relative stability of the S2 centre in natural amethyst.

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Electron paramagnetic resonance study ofFe3+inα-quartz: Hydrogen-compensated center

Cited by 19 publications

References 12 publications

Cathodoluminescence microcharacterization of point defects in α-quartz

Cathodoluminescence microcharacterization of point defects in α-quartz

The Electron Paramagnetic Resonance of Fe3+ Observed in Two Axial Sites in Synthetic Single Crystals of Zircon (ZrSiO4)

Characterisation of the Fe(III):H+ Defect Centre in Natural Amethyst

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