Defects in oxide glasses

Skuja, Linards; Hirano, Masahiro; Hosono, Hideo; Kajihara, Koichi

doi:10.1002/pssc.200460102

Cited by 251 publications

(180 citation statements)

References 58 publications

(98 reference statements)

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“…Defining point defects for an amorphous structure should generally be avoided as there is no ideal (reference) structure: for the crystalline state, the reference structure is the perfect lattice. One may think of defining defects based on under-or over-coordinated species, 10 but as we will discuss later, this is problematic for amorphous hafnia. This problem is well-known to researchers in the glass community [11][12][13][14][15][16][17] but seems to be ignored by those whose experience is mainly crystalline systems.…”

Section: Introductionmentioning

confidence: 99%

Ion migration in crystalline and amorphous HfOX

Schie

Müller

Salinga

et al. 2017

The Journal of Chemical Physics

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The migration of ions in HfO x was investigated by means of large-scale, classical molecular-dynamics simulations over the temperature range 1000 ≤ T/K ≤ 2000. Amorphous HfO x was studied in both stoichiometric and oxygen-deficient forms (i.e., with x = 2 and x = 1.9875); oxygen-deficient cubic and monoclinic phases were also studied. The mean square displacement of oxygen ions was found to evolve linearly as a function of time for the crystalline phases, as expected, but displayed significant negative deviations from linear behavior for the amorphous phases, that is, the behavior was sub-diffusive. That oxygen-ion migration was observed for the stoichiometric amorphous phase argues strongly against applying the traditional model of vacancy-mediated migration in crystals to amorphous HfO 2 . In addition, cation migration, whilst not observed for the crystalline phases (as no cation defects were present), was observed for both amorphous phases. In order to obtain activation enthalpies of migration, the residence times of the migrating ions were analyzed. The analysis reveals four activation enthalpies for the two amorphous phases: 0.29 eV, 0.46 eV, and 0.66 eV (values very close to those obtained for the monoclinic structure) plus a higher enthalpy of at least 0.85 eV. In comparison, the cubic phase is characterized by a single value of 0.43 eV. Simple kinetic Monte Carlo simulations suggest that the sub-diffusive behavior arises from nanoscale confinement of the migrating ions. Published by AIP Publishing. [http://dx

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Section: Introductionmentioning

confidence: 99%

Ion migration in crystalline and amorphous HfOX

Schie

Müller

Salinga

et al. 2017

The Journal of Chemical Physics

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“…It is known that NBOHCs can be created by the radiolysis of ≡Si-OH bonds or the cleavage of strained ≡Si-OSi≡ bonds [10]. Since the OH content is low in our fibers, the most likely precursors of NBOHCs are the strained bonds.…”

Section: Discussionmentioning

confidence: 94%

Neutron-induced defects in optical fibers

Rizzolo¹,

Morana²,

Cannas³

et al. 2014

AIP Conference Proceedings

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“…The formation of oxygen rich defects, such as NBO hole-center, peroxy linkage/radical or interstitial oxygen that can take place in the case of silica could also account for the oxygen enrichment [38]. However, the presence of oxygen rich defects is unlikely to occur in tellurite glasses.…”

Section: Discussionmentioning

confidence: 99%

Er3+-doped fluorotellurite thin film glasses with improved photoluminescence emission at 1.53 µm

Morea

Miguel

Fernandez

et al. 2016

Journal of Luminescence

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Transparent oxyfluoride tellurite thin film glasses have been produced at room temperature by pulsed laser deposition in O 2 atmosphere from an Er-doped TeO 2 -ZnOZnF 2 bulk glass. Thin film glasses present high refractive index (n≥ 1.95) and good transparency (T≥ 80%) in the visible (λ> 400nm) and near infrared range. However, their photoluminescence (PL) performance at 1.5 µm is poor. Thermal annealing at moderate temperatures (T≤ 315 ºC), well below glass crystallization, increases the PL 2 intensity by more than one order of magnitude as well as the PL lifetime up to τ≈ 3.3 ms. Film glasses present a larger fraction of TeO 3 trigonal pyramids than the bulk glass and a very large OH -content. The structure and composition of film glasses does not change upon annealing and thus the activation of the PL response is related to the improvement of the surface morphology and the significant decrease of their OHcontent.

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Defects in oxide glasses

Cited by 251 publications

References 58 publications

Ion migration in crystalline and amorphous HfOX

Ion migration in crystalline and amorphous HfOX

Neutron-induced defects in optical fibers

Er3+-doped fluorotellurite thin film glasses with improved photoluminescence emission at 1.53 µm

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