Synthesis and characterization of YAG precursor powder in the hydroxyhydrogel form

Bhattacharyya, Sunipa; Ghatak, Sankar

doi:10.1016/j.ceramint.2007.09.007

Cited by 21 publications

(7 citation statements)

References 19 publications

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“…The band about 1049 cm -1 represents -NO3 groups stretching modes. 13 There is also an absorb band in the curve of sample CP-900°C around 1076 cm -1 as shown in Fig.3(a), which may be attributed to the vibration of the precursors that decomposited incompletely. But from the Fig.3(b), it can be clearly seen that the shape of IR spectra from three kinds of powders calcined at a higher temperature of 1200°C, has no obvious difference in the whole range from 400 to 1000 cm -1 except intensity.…”

Section: Resultsmentioning

confidence: 93%

Effect of Defects on the Luminescence and Scintillation Property of YLuAG:Ce Phosphors Obtained by Different Synthetic Routes

张孔¹,

刘茜²,

苏晓彬³

et al. 2011

Acta Physico-Chimica Sinica

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Optimized YLuAG:Ce (Y0.600Lu2.364Al5O12:Ce0.036) phosphors were synthesized by three methods: nitrate-pyrolysis (NP), co-precipitation (CP) with ammonium hydrogen carbonate, and citrate-combustion (CC). Differences in the reaction process, crystallization, morphologies, photoluminescence (PL), and scintillant performance of the three kinds of phosphors were revealed and are explained using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), PL and thermoluminescence (TL) measurements and observations. Obvious differences in the emission bands and decay times of the different phosphors prepared were found and the differences were mostly caused by the defects either on the surface or in the bulk phase of the YLuAG:Ce phosphors powders. The recorded thermoluminescence spectra of the three kinds of phosphors show a different intensity and main glow peak positions. Additionally, the thermoluminescence spectra show that the synthesis methods induce defects in the phosphors. The defects result in strong trapping process effects and a high probability of radiative recombination between the trapped holes and electrons in the final phosphor powders that were obtained using the different synthesis routes.

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Section: Resultsmentioning

confidence: 93%

Effect of Defects on the Luminescence and Scintillation Property of YLuAG:Ce Phosphors Obtained by Different Synthetic Routes

张孔¹,

刘茜²,

苏晓彬³

et al. 2011

Acta Physico-Chimica Sinica

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“…These shifts can be attributed to the gradual increase of Na 2 O content which causes an increase of the non-bridging oxygen ions, as well as the gradual increase of ionic character of the glass network [23][24][25]. Supposedly both aluminum and iron cations participate in the network of the studied glass samples in the tetrahedral coordination state.…”

Section: Ftir Resultsmentioning

confidence: 99%

“…This indicated that iron acts as The band around 713 cm −1 can be attributed to the bending vibration of Al-O bonds, with Al +3 ions in the four-fold coordination state (AlO 4 ). This indicated that aluminum acts as former cations in the glass network[25].• The band around 880 cm −1 was assigned to Al-O stretching vibrations[24]. • The band around 1000 cm −1 can be attributed to the SiO 4 tetrahedron with one non bridging oxygen atom[23].…”

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confidence: 99%

Structural Study of Glass and Glass Ceramics Prepared with Egyptian Basalt

Hassaan

Saudi

Saad

et al. 2015

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Egyptian basalt rock was used to prepare some glasses with different additives of Na 2 O by the melt quenching method. The prepared glasses were characterized applying FTIR, XRD and Mössbauer Effect (ME) spectroscopy. XRD indicated that all the samples showed a homogeneous glassy phase except the sample containing 35 mol % of Na 2 O which showed a very small crystalline phase of less than 5 %. FTIR measurements indicated the presence of various structural units including SiO 4, FeO 4 and AlO 4 . ME hyperfine parameters indicated the presence of both Fe 2+ and Fe 3+ in the low Na 2 O content glasses (the first three samples), while the iron in the high Na 2 O content glasses (the last three samples) showed only the Fe 3+ state. All the glass samples were heated at 900 • C for 6 h, of which XRD analysis showed different crystallites of nanometer size. ME spectra of the heat-treated (HT) samples indicated the presence of magnesium ferrites as confirmed by XRD study.

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“…New technologies such as sol-gel, hydrothermal synthesis, pyrolysis, CVD, ceramic powders combustion and synthesis of hydroxyhydrogels have been developed (Somiya and Hirata, 1991;Samanta et al, 2001;Ismail et al, 1987;Pask et al, 1987;Segal, 1989;Tucker et al, 1990;Basu et al, 2006;Bhattacharyya and Ghatak, 2007;Kurajica et al, 2007).…”

Section: Introductionmentioning

confidence: 98%