There are three main methods for the synthesis of oxyfluoride glass ceramics. Transparent oxyfluoride glass ceramics mrs bulletin. Nano express open access distribution of nd ions in. Due to the high viscosity of low alumina content glass, the phase separated areas were smaller in these specimens. The addition of rareearths re ions affects the crystallization kinetics due to the progressive increase of t g as re concentration increases. The glass ceramics were characterized by differential scanning calorimetry, xray diffraction and scanning electron microscope, respectively. Transparent oxyfluoride glass ceramics cambridge university press. The latter technique permitted the fabrication of perfectly vitreous optical fibers of. The phase separation process was studied by thermal analysis, xray diffraction and. Transparent oxyfluoride tellurite glass with the composition of teo2sio2alf3caokf system were prepared by conventional melting and annealing technique, and the transparent oxyfluoride glass ceramics containing caf2 nanocrystallines were obtained by controlled heattreatment. Structural characterisation of transparent oxyfluoride glassceramics structural characterisation of transparent oxyfluoride glassceramics mortier, m patriarche, g. The phase separation process was studied by thermal analysis, xray diffraction and transmission electron. The sample is characterized by dta, xrd and fegesem. The glass obtained is then annealed at a temperature enabling its partial crystallization.
Optical properties of rare earth doped transparent oxyfluoride glass ceramics. Baf2 nanocrystals in the chemical composition of sio2baf2k2co3la2o3sb2o3 oxyfluoride glass systems have been prepared from melt quenching and with a subsequent heattreatment method. Nickel ion doped transparent bulk glass ceramics containing k2sif6, znf2, and kznf3 nanocrystals were elaborated to show the prospect that this novel group of oxyfluoride glass ceramics is promising for transition metal ion based photonics. The addition of rareearths re ions affects the crystallization kinetics due to the progressive increase of t g as re. Osa ytterbiumdoped oxyfluoride nanoglassceramic fibers. Jacers is a leading source for topquality basic science research and modeling spanning the diverse field of ceramic and glass materials science. The glassceramics were characterized by differential scanning calorimetry, xray diffraction and scanning electron microscope, respectively. Yangyang guo, huidan zeng, bing yang, guorong chen, jianding chen, luyi sun. Transparent oxyfluoride glass ceramics gcs containing laof. Frontiers transparent oxyfluoride nanoglass ceramics. Transparent glassceramics containing nanocrystals were prepared by controlled heattreatment of conventionally meltquenched nafyf 3al 2 o 3sio 2 oxyfluoride glass.
Selective excitation in transparent oxyfluoride glassceramics doped. The formation of srf 2 nanocrystals in gcs has been confirmed by xray diffraction xrd and transmission electron microscopy. Synthesis and luminescent properties of transparent. These materials combine the good mechanical and chemical stabilities of oxide glasses with the low phonon energy of fluoride crystals 300400 cm. Transparent oxyfluoride glassceramics containing caf2 nano. The luminescence and structural properties of these materials have been evaluated and. Low phonon energy glasses are desir able hosts for rareearth re ions because. The precipitated crystallites were composed of only cubic nayf 4 and the average diameter was estimated as less than 10 nm from the xray diffraction analysis. Sontakke, jiten ghosh and kalyandurg annapurna, glass technology laboratory, xray diffraction section central glass and ceramic research institute, csir 196, raja s.
The effect of heattreatment schedules on the crystallization behavior and the microstructure. Energy dispersive spectrometer eds results and juddofelt jo intensity parameters demonstrated the incorporation of. Transparent oxyfluoride glass ceramics mrs bulletin cambridge. In the 1970s, transparent glass ceramics gcs with nanocrys. Pdf enhanced blue emission from transparent oxyfluoride. Transparent oxyfluoride glass ceramics sciencedirect. Transparent oxyfluoride nanoglassceramics gcs containing nagdf4 nanocrystals doped with 0.
Structural characterisation of transparent oxyfluoride. This includes papers dedicated to pyroceram, vitroceram, sitall astrositall and others and indicates a sustained interest of modern researchers in oxyfluoride. There are three main methods for the synthesis of oxyfluoride glassceramics. Transparent glass ceramic gc films and selfsupported layers of composition. Transparent glass ceramics containing nanocrystals were prepared by controlled heattreatment of conventionally meltquenched nafyf 3al 2 o 3sio 2 oxyfluoride glass. Transparent oxyfluoride tellurite glass with the composition of teo2sio2alf3caokf system were prepared by conventional melting and annealing technique, and the transparent oxyfluoride glassceramics containing caf2 nanocrystallines were obtained by controlled heattreatment. The juddofelt jo parameters have been evaluated from absorption. Erbium doped transparent glassceramics were obtained in the family 50geo2 50. Transparent solgel oxyfluoride glassceramics with high. Osa enhanced emission and spectroscopic properties in. The glass ceramic is formed from precursor glasses having the following compositions, in weight percent on an oxide basis. Mather 1, aida serrano 1,3, maria vila 3,4, german r. Erbium doped transparent glassceramics were obtained in the family 50geo250.
Nickel ion doped transparent bulk glassceramics containing k2sif6, znf2, and kznf3 nanocrystals were elaborated to show the prospect that this novel group of oxyfluoride glassceramics is promising for transition metal ion based photonics. Transparent oxyfluoride nano glass ceramics gcs containing nagdf 4 nanocrystals doped with 0. A glass is first made by melting polycrystalline oxide and fluoride precursors. Transparent oxyfluoride glassceramics containing re doped fluoride nanocrystals present potential applications in the field of solidstate luminescence. Transparent oxyfluoride glass ceramics doped with rareearth elements are suitable candidates for optoelectronic devices. The number of publications about transparent glass ceramics, including oxyfluoride glass ceramics and certain trademarked materials, has steadily grown over last couple of decades, especially, after 2000.
Preparation and characterization of transparent oxyfluoride. Secu et alspectroscopic characterization of erbium doped glass ceramic indumathi kamma et althis content was downloaded from ip address 207. A glassceramic which is substantially and desirably totally transparent, and which contains a predominant crystal phase of forsterite. Structural characterisation of transparent oxyfluoride glassceramics. Pdf optical properties of rare earth doped transparent.
Spectral and structural properties 151 studies of ucl. The glass samples were prepared and characterized by density dta and raman spectroscopy. Transparent oxyfluoride glass ceramics have been widely investigated for promising applications in photonics such as in solid state lasers 1, optical thermometry 2,3, xray imaging 4,5, non. Oxyfluoride transparent glass ceramics request pdf. Oct 09, 2004 structural characterisation of transparent oxyfluoride glassceramics structural characterisation of transparent oxyfluoride glassceramics mortier, m patriarche, g.
This includes papers dedicated to pyroceram, vitroceram, sitall astrositall and others and indicates a sustained interest of modern researchers in oxyfluoride glass ceramics. Nanoparticles, glass ceramics, thermal induction and corrosion treatment introduction since wang and ohwaki 1 reported that transparent oxyfluoride glass ceramics gcs showed more efficient upconversion uc from infrared to visible than fluoride glass in 1993, many researchers have paid attention to oxyfluoride gcs. Results showed that alumina content had an effect on phase separation and viscosity of the glass. In recent years, rareearth ions doped transparent oxyfluoride glass ceramics have attracted great attentions for their low phonon energy environments of fluoride nanocrystals and high chemical and mechanical stabilities of oxide glassy matrix. Transparent oxyfluoride glassceramics oxfgcs have attracted great interest in the field of photonics since the pioneering work of wang and ohwaki. Transparent oxyfluoride glass ceramics volume 23 issue 11 matthew j. On the basis of the joint spectroscopic and structural characterizations, we suggest that the precipitation of fluoride ncs is correlated with the preexistence of the. Xray diffraction xrd, raman spectra and transmission electron microscope tem confirmed the formation of laof nanocrystals in glass matrix.
Frontiers transparent oxyfluoride nanoglass ceramics doped. In recent years, rareearth ions doped transparent oxyfluoride glassceramics have attracted great attentions for their low phonon energy environments of fluoride nanocrystals and high chemical and mechanical stabilities of oxide glassy matrix. Oxyfluoride glasses are used as glass polyalkenoate cements in dentistry where fluorine facilitates glass degradation due to disruption of the network and also enhances the formation of fluorine complexes in a poly salt matr ix. Transparent oxyfluoride glassceramics doped with rareearth elements are suitable candidates for optoelectronic devices. Enhanced emission and spectroscopic properties in oxyfluoride. Transparent glassceramics for optical applications mrs. Understanding enhanced upconversion luminescence in.
Enhanced blue emission from transparent oxyfluoride glass. The optical transmittance is about 78%87% in the visible. The effects of alumina content and heat treatment on upconversion properties of codoped erf 3 ybf 3 oxyfluoride glass ceramics were investigated. The luminescence and structural properties of these materials have been evaluated and the results are reported. Transparent oxyfluoride glass ceramics oxfgcs have attracted great interest in the field of photonics since the pioneering work of wang and ohwaki. Transparent oxyfluoride nanoglassceramics gcs containing nagdf 4 nanocrystals doped with 0. Transparent oxyfluoride glassceramic films and selfsupported layers with composition. Oxyfluoride glassceramics for transition metal ion based. Novel oxyfluoride glass and transparent glassceramics for. Rareearth ions doped transparent oxyfluoride glassceramics. This study investigated the effects of ceo 2 on structure and synthesis of boroaluminosilicate transparent glass ceramics containing caf 2 nanocrystals prepared through isothermal crystallization of the meltquenched glasses with composition 54sio 2 10b 2 o 3 al 2 o 3 14na 2 o3zno2li 2 o4caf 2 doped with 01. The fabrication of nanoparticles in aqueous solution from. Transparent oxyfluoride glass ceramics request pdf.
Transparent oxyfluoride glassceramics containing caf2. Castro 3,4, david bravo 5, rolindes balda 6,7, joaquin fernandez 8, alicia duran 1 and yolanda castro 1. Since wang and ohwaki reported that transparent oxyfluoride glass ceramics gcs showed more efficient upconversion uc from infrared to visible than fluoride glass in 1993, many researchers have paid attention to oxyfluoride gcs. Aluminasilicate glass matrices are particularly suitable for their excellent mechanical, thermal and chemical properties compared to phosphate or fluoride glasses. Structural characterisation of transparent oxyfluoride glass. Transparent oxyfluoride tellurite glassceramics containing caf2 nanocrystals were prepared by high temperature melting method. The result indicates that the main phase of crystal is caf 2 and the crystalline particle size is 15 nm. With controlled crystallisation of glasses by inhomogeneous nucleation and growth during reheating, pbf2 crystallites of nanometric size and a filling factor of 10. Transparent oxyfluoride nanoglass ceramics doped with pr3. Fedorov et althis content was downloaded from ip address 157. A glass ceramic which is substantially and desirably totally transparent, and which contains a predominant crystal phase of forsterite. The results showed that the caf2 nanocrystals were spherical and the average size was found to. The authors described transparent oxyfluoride glass ceramics as a new class of materials that combines all the best properties of fluoride nanocrystals responsible for control of the spectral properties of rare earth dopants and excellent macroscopic features of oxide glasses such as chemical stability, mechanical tenacity and optical quality. Baf2 nanocrystals in the chemical composition of sio2baf2k2co3la2o3sb2o3 oxyfluoride glass systems have been prepared from melt quenching.
Glass ceramics with rareearth titanates, titanateszirconates, and niobates in dual roles of nucleators and active crystals. Preparation and characterization of neodymiumdoped. Transparent aluminosilicate oxyfluoride glass ceramics. The glassceramic is formed from precursor glasses having the following compositions, in weight percent on an oxide basis. The local structures of glasses and glass ceramics were characterized by advanced one and. Strong upconversion emissions at around 525, 550, and 660 nm, and weak up. Nickel ion doped transparent bulk glass ceramics containing k 2 sif 6, znf 2, and kznf 3 nanocrystals were elaborated to show the prospect that this novel group of oxyfluoride glass ceramics is promising for transition metal ion based photonics. Crackfree films and selfsupported layer with a maximum thickness up to 1. In this work, we try to obtain transparent rareearth doped glassceramics improving the optical cross sections of the rare earth ions by changing their surrounding. Thepartial devitrificationofan oxyfluoride glassis the oldest andbest known method. Glassceramics with rareearth titanates, titanateszirconates, and niobates in dual roles of nucleators and active crystals.
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