Highly Transparent BaAl<sub>4</sub>O<sub>7</sub> Polycrystalline Ceramic Obtained by Full Crystallization from Glass

Allix, Mathieu; Alahraché, Salaheddine; Fayon, Franck; Suchomel, Matthew R.; Porcher, Florence; Cardinal, Thierry; Matzen, Guy

doi:10.1002/adma.201202282

Cited by 103 publications

(110 citation statements)

References 26 publications

Supporting

Mentioning

109

Contrasting

Unclassified

Order By: Relevance

“…Barium aluminotitanate glasses are of interest due to physical properties that lend them to potential applications, for example, in the encapsulation of radionucleides in highly active nuclear waste [1][2][3][4], high refractive index materials for use in high-capacity optical disk storage systems [5], broadband photoluminescent materials [6], and as precursors for glass-ceramics for optical [7] and ferroelectric [8] applications. Further applications may arise from the ability to control the local nucleation and growth of crystals to form patterned glass ceramics by systematic annealing of the glass through, for example, laser treatment.…”

Section: Introductionmentioning

confidence: 99%

Structure of Ba-Ti-Al-O glasses produced by aerodynamic levitation and laser heating

Kidkhunthod¹,

Skinner

Barnes³

et al. 2014

Phys. Rev. B

View full text Add to dashboard Cite

Ba 0.09 Al 0.18 Ti 0.12 O 0.61 glasses have been produced by aerodynamic levitation and laser heating. Neutron diffraction, x-ray diffraction, x-ray absorption spectroscopy, molecular dynamics simulation, and reverse Monte Carlo refinement methods have been used to obtain a detailed atomistic structural model of the glass. This model has been used to investigate its atomic coordination and network structure. It is found that the Al atoms are almost exclusively fourfold tetrahedrally coordinated to oxygen atoms. In contrast, the Ti atoms coordinate to oxygen atoms in approximately equal numbers of four-and fivefold coordinated sites with a small number of sixfold sites. The results show the presence of some tetrahedral TiO 4 structural motifs although the dominant O-Ti-O bond angle occurs at 90• . It is found that Al/Ti-O network structure shows strong similarities with other oxide glass forming systems although a first sharp diffraction peak is not observed. The results are used to discuss the unusual properties of the Ba-Al-Ti-O glasses produced under different quenching conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Structure of Ba-Ti-Al-O glasses produced by aerodynamic levitation and laser heating

Kidkhunthod¹,

Skinner

Barnes³

et al. 2014

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…

…”

mentioning

confidence: 99%

Tuneable Nanostructuring of Highly Transparent Zinc Gallogermanate Glasses and Glass‐Ceramics

Chenu

Véron

Genevois

et al. 2014

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

routes [ 9,10 ] have been recently reported. Technical challenges remain to produce these transparent ceramic materials (complicated and time-consuming procedures to avoid porosity, [ 11 ] limited compositions, segregation of doping agents, etc.). Many of these obstacles can be avoided via the use of glass-ceramic technology. [ 12 ] Therefore, the development of transparent glassceramics is of great interest for many promising optical applications [ 13 ] (solar concentrators, [ 14 ] optical memory media, [ 15 ] telescope mirrors, [ 16 ] amplifi ers, [ 17 ] electrooptical devices [ 18 ] ). Unlike single crystals and polycrystalline sintered ceramics, glass-ceramic materials offer considerable advantages such as a wider range of accessible chemical compositions, fabrication of complex shapes, and largescale production by fast and cost-effi cient glass-forming processes. The absence of porosity, control of the microstructure, and high transparency allow a large variety of optical glass-ceramics to be designed and commercialized.Glass-ceramic technology is generally based on the controlled crystallization of glass. [ 12 ] According to the Rayleigh-GansDebye [ 19 ] and Hendy theories, [ 20 ] the retention of transparency during glass crystallization typically requires a homogeneous distribution of nanoscale crystals in the glass-ceramic material to minimize light scattering. Nucleating agents (such as ZrO 2 and TiO 2 ) are thus often added in the parent glass to produce, by heat treatment, uniformly dispersed nanocrystals. [ 21 ] Nevertheless, a few exceptions with large crystal sizes (β-quartz- [ 16 ] and Na 2 O-CaO-SiO 2 -based glass-ceramics [ 22 ] ) have been reported, and their transparency is directly linked to a very small refractive index difference between the amorphous and crystalline phases. Much attention has been devoted to transparent silicate glass-ceramics, which often present low thermal expansion, thermal stability, and high transparency in both visible and near-infrared ranges. [ 12,16 ] However, silicatebased glass-ceramics present a high phonon energy, which considerably limits their transparency in the infrared range and therefore their applications in this domain. The development of oxyfl uoride [23][24][25][26] and chalcogenide [ 27,28 ] glass-ceramics has extended the transparency toward the infrared range. These materials offer a real alternative allowing access to applications in telecommunications [ 25,26,29 ] (up-conversion devices, waveguide amplifi ers), although their poor chemical durability and complex fabrication (synthesis under a controlled New nanostructured gallogermanate-based glass materials exhibiting high transparency in the visible and infrared regions are fabricated by conventional melt-quenching. These materials can accommodate wide oxide compositions and present nanoscale phase separation, in the form of droplets well separated from the germanate matrix. The size of the nanostructures can be tailored depending on the composition. A single heat treatment then allows select...

show abstract

“…It is assumed that such a glass ceramic should be fully crystalline (except minor glassy phase at grain boundaries typical of ceramics) with grain size b100 nm. Glass ceramics meeting these requirements have thus far been produced only in a few oxide systems, notably Al-(La, Gd, Y)-Zr-O (grain size~100 nm) [12] and Ba-Al-O (grain size 500-5000 nm) [13]. One oxide system previously investigated specifically for use as a bulk ceramic window for the midwave infrared (MWIR, 3-5 μm) is based on Ba-Ga-Ge-O glasses [5] containing a small volume fraction of BaGe 4 O 9 crystals [4].…”

Section: Previous Work On Ir Glass-ceramic Systemsmentioning

confidence: 99%

“…This results in a K gl of 0.270-0.373. In order to compare to other systems where only T c and T g are reported, T c -T g was calculated, giving 75-90°C for the GaLS72-10Ca-w glass, compared to 49°C for BaAl 4 O 7 [13] and 218°C for cordierite (sample 1 in [15]). It can thus be seen that the Ga-La-Ca-S studied is not a particularly good glass-former, but is better than BaAl 4 O 7 , which only forms a glass when a levitation-laser method is used giving very high quench rates [13].…”

Section: Thermal Analysismentioning

confidence: 99%

Infrared-transparent glass ceramics: An exploratory study

McCloy

Riley

Pierce

2015

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

a b s t r a c tIn this work, the vision and need for a fully ceramized long-wave infrared (LWIR)-transmitting glass ceramic have been articulated. Three sulfide systems were explored including two with La 2 S 3 in hopes of imparting strong bonds from this refractory sulfide, and two containing GeS 2 in hopes of widening the glass-forming region. Attempts were made to produce glasses in the Ga 2 S 3 -La 2 S 3 -(ZnS,CaS) system, the GeS 2 -La 2 S 3 system, and the GeS 2 -Ga 2 S 3 -CdS system. Water quenching produced glasses of Ga 2 S 3 -La 2 S 3 -CaS and GeS 2 -Ga 2 S 3 -CdS. Microstructural and thermal analyses were used to explore nucleation and growth in these systems and infrared transmission and mechanical hardness showed potential for LWIR window use. The GeS 2 -Ga 2 S 3 -CdS system showed good LWIR transmission and pre-crystallized hardness superior to chemical vapor deposited ZnS. The Ga 2 S 3 -La 2 S 3 glasses did not appear to be viable candidates at this time due to a small temperature window between crystallization and glass transition temperatures and problems with oxygen contamination in the La 2 S 3 source. Suggestions are made for two alternative methods for producing fully ceramized LWIR-transmitting glass ceramics.

show abstract

Highly Transparent BaAl₄O₇ Polycrystalline Ceramic Obtained by Full Crystallization from Glass

Cited by 103 publications

References 26 publications

Structure of Ba-Ti-Al-O glasses produced by aerodynamic levitation and laser heating

Structure of Ba-Ti-Al-O glasses produced by aerodynamic levitation and laser heating

Tuneable Nanostructuring of Highly Transparent Zinc Gallogermanate Glasses and Glass‐Ceramics

Infrared-transparent glass ceramics: An exploratory study

Contact Info

Product

Resources

About

Highly Transparent BaAl4O7 Polycrystalline Ceramic Obtained by Full Crystallization from Glass

Cited by 103 publications

References 26 publications

Structure of Ba-Ti-Al-O glasses produced by aerodynamic levitation and laser heating

Structure of Ba-Ti-Al-O glasses produced by aerodynamic levitation and laser heating

Tuneable Nanostructuring of Highly Transparent Zinc Gallogermanate Glasses and Glass‐Ceramics

Infrared-transparent glass ceramics: An exploratory study

Contact Info

Product

Resources

About

Highly Transparent BaAl₄O₇ Polycrystalline Ceramic Obtained by Full Crystallization from Glass