Design of oxy-fluoride glass-ceramics containing NaLaF4 nano-crystals

Pablos-Martín, A. de; Mather, Glenn C.; Muñoz, Francisco; Bhattacharyya, Somnath; Höche, Thomas; Jinschek, Joerg R.; Heil, Tobias; Durán, Alicia; Pascual, María J.

doi:10.1016/j.jnoncrysol.2010.04.057

Cited by 75 publications

(76 citation statements)

References 39 publications

(36 reference statements)

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“…A similar study was reported by Sroda,95 in the crystallization process of NaLaF 4 , affected by Er 3z ions. de Pablos-Martín et al 96 described the crystallisation mechanism of NaLaF 4 and the formation of a diffusional barrier, similar to those work reported in Refs. 44, 82 and 90.…”

supporting

confidence: 76%

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

Pablos-Martín

Durán

Pascual

2012

International Materials Reviews

150

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Rare earth (RE) doped oxyfluoride glass ceramics possess interesting optical properties with applications in telecommunications and optoelectronics, such as solid state lasers, optical amplifiers, etc. These materials combine the transparency and mechanical and chemical resistance of aluminosilicate glasses with the low phonon energy and facile incorporation of RE ions in the fluoride crystals. The incorporation of RE ions in the crystalline phases enhances the laser emission intensity, a major property of these materials. Transparency is achieved when crystal size is in the nanometric scale, usually below 40 nm, which avoids light scattering. A strict control of the nucleation and crystal growth processes is therefore necessary which requires a deep knowledge of the crystallisation mechanisms. The great activity and publications in this field in the last decades merit a review providing a comparative study of the different nanoglass ceramic systems, their structural and optical characterisation and their main properties and applications. This is the objective of this review paper which includes 232 references. A general discussion on glass nucleation and crystallisation theories and more relevant crystallisation parameters and characterisation techniques are put forward in the first section of the review, focused on nanocrystallisation processes in oxyfluoride systems. In the second section, the principal RE doped glass ceramics are presented. After a general introduction about the luminescence processes, including up-and down-conversion, the behaviour of RE elements in glasses and crystals are discussed. Glass ceramic compositions have been divided as follows: glass ceramics with a glass composition following Wang and Ohwaki's oxyfluoride glass ceramic, 1 ; and glass ceramics with different matrix compositions, arranged by crystalline phases. Relevant properties, mainly optical and laser, are described in each system along with the most relevant applications of these materials.

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supporting

confidence: 76%

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

Pablos-Martín

Durán

Pascual

2012

International Materials Reviews

150

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“…The described mechanism is an example of a self‐organized process. It should be noted, however, also in nonphase separated oxyfluoride glasses, as shown for the systems with BaF 2 and LaF 3 , in the amorphous matrix Ba‐F as well as La‐F structures are already formed …”

Section: Strategies For the Formation Of Nanocrystalline Glass‐ceramicssupporting

confidence: 52%

“…In these studies, the formation of core/shell structures is described which form spontaneously and lead to a drastic increase in the viscosity of these shells and to the formation of stresses which decelerate further crystal growth. This has been performed for the crystallization of oxides (Fe 3 O x, quartz or spodumen) or of fluorides (CaF 2, SrF 2, BaF 2, LaF 3, or NaREF 4 ). In all these systems, the viscosity of the residual glassy phase increases during the course of nucleation and crystal growth.…”

Section: Introductionmentioning

confidence: 99%

Transparent Nano Crystalline Glass‐Ceramics by Interface Controlled Crystallization

Bocker

Rüssel

Avramov

2013

Int J of Appl Glass Sci

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A prerequisite for the preparation of nano glass‐ceramics is an increase in viscosity of the residual glassy matrix phase during the course of the crystallization process. This results in a deceleration of the crystal growth process due to increasing stresses, which finally may lead to a total freezing of the crystallization process. In principle, two routes for the preparation of nano glass‐ceramics exist: in one of these routes, the first step is a phase separation in which a droplet phase is formed. Inside this droplet phase, the crystals are precipitated. In the other route, a preceding phase separation does not occur and the nucleation takes place in a homogeneous glassy phase. In both cases, the crystal growth velocity is high until the crystals reach a size of some nanometers or some ten nanometers, then the crystal growth velocity decreases strongly.

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“…The formation of these nano-crystals should be ascribed to a diffusion layer which acts as the barrier to hamper the further crystal growth [16][17][18]. In detail, the diffusion layer around Na 2 MgSiO 4 is enriched in the glass-forming components since the present samples belong to non-isochemical glass system, and this increases the viscosity, and hence, hinders the diffusion of modifying ions (e.g.…”

Section: Resultsmentioning

confidence: 87%

Transparent phosphosilicate glasses containing crystals formed during cooling of melts

Liu¹,

Zhang²,

He³

et al. 2011

Journal of Non-Crystalline Solids

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Effect of P 2 O 5 -SiO 2 substitution on spontaneous crystallization of SiO 2 -Al 2 O 3 -P 2 O 5 -Na 2 O-MgO melts during cooling was studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and rotation viscometry. Results show that addition of P 2 O 5 leads to amorphous phase separation (APS), i.e., phosphate-and silicate-rich phases. It is due to the tendency of Mg 2+ to form [MgO 4 ] linking with [SiO 4 ]. Molar substitution of P 2 O 5 for SiO 2 enhances the network polymerization of silicate-rich phase in the melts, and thereby the spontaneous crystallization of cubic Na 2 MgSiO 4 is also enhanced during cooling of the melts. In addition, the sizes of the local crystalline and separated glassy domains are smaller than the wavelength of the visible light, and this leads to the transparency of the obtained glasses containing crystals.

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Design of oxy-fluoride glass-ceramics containing NaLaF4 nano-crystals

Cited by 75 publications

References 39 publications

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

Transparent Nano Crystalline Glass‐Ceramics by Interface Controlled Crystallization

Transparent phosphosilicate glasses containing crystals formed during cooling of melts

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