10 Citations
Origin and significance of the yellow cathodoluminescence (CL) of quartz
- Physics
- 2015
Abstract The origin of yellow cathodoluminescence (CL) in quartz has been investigated by a combination of CL microscopy and spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, and…
The Mössbauer spectra of prasiolite and amethyst crystals from Poland
- GeologyPhysics and Chemistry of Minerals
- 2016
Mössbauer spectroscopy of green (prasiolite) and violet (amethyst) quartz crystals from the Sudety Mountains (Poland) has shown that neither Fe2+ nor Fe4+ ions are present in them. Only Fe3+ ions…
Thermodynamic and magnetic properties of surface Fe3+ species on quartz: effects of gamma-ray irradiation and implications for aerosol–radiation interactions
- Environmental SciencePhysics and Chemistry of Minerals
- 2012
Samples of a natural amethyst, pulverized in air, and irradiated for gamma-ray doses from 0.14 to 70 kGy, have been investigated by powder electron paramagnetic resonance (EPR) spectroscopy from 90…
Identifying the reactive sites of hydrogen peroxide decomposition and hydroxyl radical formation on chrysotile asbestos surfaces
- ChemistryParticle and Fibre Toxicology
- 2020
The results suggest that the mere presence of vacancy sites may pose a risk, as incorporation of external Fe into a tetrahedral coordination environment can lead to HO • generation.
Trace Element Compositions and Defect Structures of High-Purity Quartz from the Southern Ural Region, Russia
- Geology
- 2017
Quartz samples of different origin from 10 localities in the Southern Ural region, Russia have been investigated to characterize their trace element compositions and defect structures. The analytical…
Brazilian Quartz Deposits with Special Emphasis on Gemstone Quartz and its Color Treatment
- Geology
- 2012
The exploration of Brazilian quartz deposits started in the beginning of the twentieth Century, with intensification of production during the Second World War. Four geological environments are the…
A Fe K-edge XAS study of amethyst
- PhysicsPCM 2010
- 2010
An X-ray absorption spectroscopy (XAS) study of the Fe local environment in natural amethyst (a variety of α-quartz, SiO2) has been carried out. Room temperature measurements were performed at the Fe…
A DEMI-CENTURY OF MAGNETIC DEFECTS IN a-QUARTZ
- Geology
- 2000
One goal of this manuscript is to delineate the progress (1950-2000) of the study of the paramagnetic ’point’ defects in crystalline silicon dioxide (α-quartz), leaning more than a little on the…
Cathodoluminescence Microcharacterisation of Silicon Dioxide Polymorphs
- Materials Science
- 2000
Optical cathodoluminescence (CL) microscopy and CL microanalysis are useful characterization techniques in the geosciences (Yacobi and Holt 1990; Remond et al. 1992a, 1997; Hagni 1987): Information…
Defektstruktur und Farbzentren im Quarz
- Physics
- 2000
Quarz stellt eines der am haufigsten vorkommenden Minerale der Erde dar. Er besitzt zahlreiche Farbvarietaten die zum grosten Teil durch Defektstruk- turen und Farbzentren hervorgerufen werden. Die…
References
EPR of iron centres in silicon dioxide
- Physics
- 1994
A review is presented of the present status of EPR-based understanding of Fe in SiO2. As a primary goal, a guide to the literature is given. Quantitative evaluation of all relevant spin-Hamiltonian…