Intrinsic absorption threshold of stishovite and coesite

Trukhin, A.N.; Dyuzheva, T. I.; Lityagina, L. M.; Bendeliani, N. A.

doi:10.1016/j.ssc.2004.04.027

Cited by 21 publications

(55 citation statements)

References 12 publications

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“…It was also found that luminescence of stishovite single crystal appears both in recombination and intra center processes [1,[3][4][5], and in ionizing or photo irradiation. Additionally, in the case of poly-crystals, the photoluminescence excitation spectrum was measured [2].…”

Section: Introductionmentioning

confidence: 97%

“…They are α-quartz, cristobalite, stishovite and coesite Polymorph modifications are based on the ability of silicon to undergo sp 3 hybridization and belong to a family of tetrahedron structured materials. An investigation of these modifications is of interest both for fundamental science and for applications in industry.…”

Section: Introductionmentioning

confidence: 99%

“…An investigation of these modifications is of interest both for fundamental science and for applications in industry. Stishovite, a dense (4.28 g·cm −3 ) octahedron structured polymorph modification has not been studied in sufficient depth yet, however, theoretical and experimental approaches of its study have now commenced and the first results have been obtained [1][2][3][4][5]. It is hard to believe that stishovite and α-quartz can be composed of the same elements in equal proportions, yet can be so different from each other by properties.…”

Section: Introductionmentioning

confidence: 99%

“…It is hard to believe that stishovite and α-quartz can be composed of the same elements in equal proportions, yet can be so different from each other by properties. The main element of the structure of dense silicon dioxidestishovite, is based on another form of silicon hybridization -d 2 sp 3 , providing an octahedral surrounding of the silicon with oxygen ions. Our interest is to study the changes in the electronic states and point defects that arise due to the transition from a tetrahedron structured modification to an octahedron structured modification of the silicon dioxide.…”

Section: Introductionmentioning

confidence: 99%

“…Bendeliani, private communication So far, the position of the intrinsic absorption threshold was determined for a stishovite single crystal and it is situated at 8.75 eV [4] -higher than that for the main tetrahedron structured silicon dioxide crystal -α-quartz, for which it is at 8.5 eV at room temperature. It was discovered that stishovite single-crystal possesses luminescence with a sufficiently high yield both under x-ray or cathode and photo excitations [1,[3][4][5], so luminescence methods could provide valuable information about the properties of electronic states and point defect in stishovite crystal.…”

Section: Introductionmentioning

confidence: 99%

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Luminescence of silicon Dioxide — silica glass, α-quartz and stishovite

Trukhin¹,

Šmits

Chikvaidze

et al. 2011

Open Physics

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Abstract:This paper compares the luminescence of different modifications of silicon dioxide -silica glass, α-quartz crystal and dense octahedron structured stishovite crystal. Under x-ray irradiation of pure silica glass and pure α-quartz crystal, only the luminescence of self-trapped exciton (STE) is detected, excitable only in the range of intrinsic absorption. No STE luminescence was detected in stishovite since, even though its luminescence is excitable below the optical gap, it could not be ascribed to a self-trapped exciton. Under ArF laser excitation of pure α-quartz crystal, luminescence of a self-trapped exciton was detected under two-photon excitation. In silica glass and stishovite mono crystal, we spectrally detected mutually similar luminescences under single-photon excitation of ArF laser. In silica glass, the luminescence of an oxygen deficient center is presented by the so-called twofold coordinated silicon center (L.N. Skuja et al., Solid State Commun. 50, 1069(1984). This center is modified with an unknown surrounding or localized states of silica glass (A.N. Trukhin et al., J. Non-Cryst. Solids 248, 40 (1999)). In stishovite, that same luminescence was ascribed to some defect existing after crystal growth. For α-quartz crystal, similar to silica and stishovite, luminescence could be obtained only by irradiation with a lattice damaging source such as a dense electron beam at a temperature below 80 K, as well as by neutron or γ-irradiation at 290 K. In spite of a similarity in the luminescence of these three materials (silica glass, stishovite mono crystal and irradiated α-quartz crystal), there are differences that can be explained by the specific characteristics of these materials. In particular, the nature of luminescence excited in the transparency range of stishovite is ascribed to a defect existing in the crystal after-growth. A similarity between stishovite luminescence and that of oxygen-deficient silica glass and radiation induced luminescence of α-quartz crystal presumes a similar nature of the centers in those materials.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Luminescence of silicon Dioxide — silica glass, α-quartz and stishovite

Trukhin¹,

Šmits

Chikvaidze

et al. 2011

Open Physics

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host‐defect luminescence of stishovite

Trukhin

Kūlis

Jansons

et al. 2005

phys. stat. sol. (c)

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A detailed study of the 4.75 eV luminescence band of stishovite single crystal (SiO 2 with rutile structure) is reported. Kinetics of luminescence intensity is studied at durable (tens of minutes) X-ray excitation. The observed behaviour of the band intensity is explained by creation and destruction of luminescence centres depending on temperature both being determined by radiation stimulated diffusion of atomic particles. The luminescence decay is observed to last for minutes after X-ray irradiation while only for ns and hundreds of µs under pulsed e-beam irradiation suggesting a complicated recombination of the created defects. The UV band of stishovite is compared with the 4.9 eV luminescence band in α-quartz, which could not be created by X-ray. The latter being associated with transient centres created by destructive electronbeam irradiation or with permanent centres at neutron or γ-irradiation, and with oxygen-deficient luminescence of silica glass.

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