Tunneling states in neutron-irradiated quartz: Measurements of the ultrasonic attenuation and velocity change

Vanelstraete, A; Laermans, C.

doi:10.1103/physrevb.42.5842

Cited by 36 publications

(23 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some authors consider that this effect appears in parallel with the overlapping of individual ion tracks at high enough fluences [29]. The compaction effect reduces the bond strains leading to a more perfect structure (metamict phase [30,31]) closer to that of damaged quartz (see below). Then, this reduces the trapping capability for excitons [23,26].…”

Section: Discussionmentioning

confidence: 99%

Ionoluminescence induced by swift heavy ions in silica and quartz: A comparative analysis

Jiménez-Rey

Peña‐Rodríguez

Manzano-Santamaría

et al. 2012

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

El acceso a la versión del editor puede requerir la suscripción del recurso Access to the published version may require subscription AbstractIonoluminescence (IL) of the two SiO 2 phases, amorphous silica and crystalline quartz, has been comparatively investigated in this work, in order to learn about the structural defects generated by means of ion irradiation and the role of crystalline order on the damage processes. Irradiations have been performed with Cl at 10 MeV and Br at 15 MeV, corresponding to the electronic stopping regime (i.e., where the electronic stopping power S e is dominant) and well above the amorphization threshold. The lightemission kinetics for the two main emission bands, located at 1.9 eV (652 nm) and 2.7 eV (459 nm), has been measured under the same ion irradiation conditions as a function of fluence for both, silica and quartz. The role of electronic stopping power has been also investigated and discussed within current views for electronic damage. Our experiments provide a rich phenomenological background that should help to elucidate the mechanisms responsible for light emission and defect creation.

show abstract

Section: Discussionmentioning

confidence: 99%

Ionoluminescence induced by swift heavy ions in silica and quartz: A comparative analysis

Jiménez-Rey

Peña‐Rodríguez

Manzano-Santamaría

et al. 2012

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

show abstract

“…These are similar fluences to those at which the light yield was observed to decrease. In the denser structure, closer to a damaged quartz, average bond strain is reduced [64] reducing the exciton trapping rate and hence the intensity of the red and blue light [49,51].…”

Section: Oxygen Irradiation In Silicamentioning

confidence: 99%

In-situ luminescence monitoring of ion-induced damage evolution in SiO2 and Al2O3

Crespillo

Graham

Zhang

et al. 2016

Journal of Luminescence

View full text Add to dashboard Cite

a b s t r a c tReal-time, in-situ ionoluminescence measurements provide information of evolution of emission bands with ion fluence, and thereby establish a correlation between point defect kinetics and phase stability. Using fast light ions (2 MeV H and 3.5 He MeV) and medium mass-high energy ions (8 MeV O, E¼ 0.5 MeV/amu), scintillation materials of a-SiO 2 , crystalline quartz, and Al 2 O 3 are comparatively investigated at room temperature with the aim of obtaining a further insight on the structural defects induced by ion irradiation and understand the role of electronic energy loss on the damage processes. For more energetic heavy ions, the electronic energy deposition pattern offers higher rates of excitation deeper into the material and allows to evaluate the competing mechanisms between the radiative and non-radiative de-excitation processes. Irradiations with 8 MeV O ions have been selected corresponding to the electronic stopping regime, where the electronic stopping power is dominant, and above the critical amorphization threshold for quartz. The usefulness of IBIL and its specific capabilities as a sensitive tool to investigate the material characterization and evaluation of radiation effects are demonstrated.Published by Elsevier B.V.

show abstract

“…But in spite of its success, this model is phenomenological and gives no indication about the microscopic origin of the TS. In search of the microscopic origin, many amorphous 1 as well as defective crystalline 3,4 solids have been investigated. Neutron-irradiated quartz in particular turned out to be very attractive as a model for the glassy state, since varying the neutron dose allows continuous structural variations from the perfectly ordered crystal to the amorphous network disorder.…”

Section: Introductionmentioning

confidence: 99%

Tunneling states in vitreousGeO2s

Laermans¹,

Keppens²,

Weeks³

1997

Phys. Rev. B

View full text Add to dashboard Cite

Ultrasonic measurements of the attenuation and the velocity variation have been carried out in amorphous GeO 2 at low temperature ͑0.3-10 K͒ and high frequencies ͑80-210 MHz͒. From numerical fits to the tunneling model, the typical parameters of the tunneling states ͑TS͒ were determined and compared to those found for vitreous SiO 2 . The study reveals that in a-GeO 2 , which is considered as a close structural analog to a-SiO 2 , although the density of states is found to be very similar in both materials, the coupling between the TS and the phonons is significantly smaller. In the model of coupled tetrahedra as the origin of the TS, this difference can be understood in view of the fact that numerical calculations about the vibrational characteristics of network amorphous solids indicate that the tetrahedra are more decoupled in vitreous GeO 2 than in vitreous silica.

show abstract

Tunneling states in neutron-irradiated quartz: Measurements of the ultrasonic attenuation and velocity change

Cited by 36 publications

References 22 publications

Ionoluminescence induced by swift heavy ions in silica and quartz: A comparative analysis

Ionoluminescence induced by swift heavy ions in silica and quartz: A comparative analysis

In-situ luminescence monitoring of ion-induced damage evolution in SiO2 and Al2O3

Tunneling states in vitreousGeO2s

Contact Info

Product

Resources

About