Fabrication, Microstructure, and Luminescent Properties of Ce3+
 -Doped Lu3
Al5
O12
 (Ce:LuAG) Transparent Ceramics by Low-Temperature Vacuum Sintering

Yb rare earth doped YAG ultrafine particles were synthesized by the stearate melting method using yttrium stearate, ytterbium stearate and aluminum tristearate as starting materials. The phase formation of Yb:YAG, the properties and the sintering activity of the powders were investigated by means of XRD, SEM, dilatometry and vacuum sintering. The results show that pure Yb:YAG nanopowders can be obtained by calcining the co-melted precursor at a relatively low temperature of 800 °C for 4 h. The powders calcined at 1000°C have better sintering activity than the powders calcined at other temperatures. For the Yb:YAG powders doping with 0.5% TEOS, the compact can be sintered to 99.2% of the theoretical density at 1600 °C and 99.7% at 1700 °C. The transparent Yb:YAG ceramics obtained by vacuum sintering at 1700 °C for 5 h exhibit a pore-free and uniform microstructure.

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Preparation and Luminescent Properties of 0.1%Ce3+:BaF2 Laser Ceramics by Vacuum Sintering

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1142.79 ◽

2017 ◽

Vol 1142 ◽

pp. 79-84 ◽

Cited By ~ 1

Author(s):

Ya Mei Jiao ◽

Jun Ming Luo

Keyword(s):

Fluorescence Intensity ◽

Sintering Temperature ◽

Luminescent Properties ◽

Holding Time ◽

Light Transmittance ◽

Transparent Ceramics ◽

Vacuum Sintering ◽

Excitation Peak ◽

Excitation Light ◽

Maximum Light

0.1% Ce3+:BaF2 powders were prepared by coprecipitation method. Then the transparent ceramics were prepared by vacuum sintering. The effectts of sintering temperature and holding time on transparent ceramics were studied. The results show that the 0.1% Ce3+:BaF2 powders prepared by coprecipitation are approximately spherical with the size ranging from 200~300nm and good dispersion. The maximum light transmittance of the 0.1% Ce3+:BaF2 transparent ceramics reaches 69.2% when the sintering temperature is 1275°C. The fluorescence intensity of the transparent ceramics enhances with the increase of the sintering temperature. There are two characteristic f-f transition emission peaks at 610nm and 650nm when the excitation peak is at 290nm. The maximum transparency of 71.4% emerges when the holding time is 6h at 1275°C and the fluorescence intensity reaches the maximum. The 528nm (5D1→2F7/2) appears when excitated by the 524nm excitation light.

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Solution-Based Processing of Sc2O3 Nanopowders Yielding Transparent Ceramics

Journal of Materials Research ◽

10.1557/jmr.2004.19.3.733 ◽

2004 ◽

Vol 19 (3) ◽

pp. 733-736 ◽

Cited By ~ 6

Author(s):

Ji-Guang Li ◽

Takayasu Ikegami ◽

Toshiyuki Mori

Keyword(s):

Low Temperature ◽

Single Crystals ◽

Ammonium Sulfate ◽

Room Temperature ◽

Wavelength Region ◽

Transparent Ceramics ◽

Vacuum Sintering ◽

Visible Wavelength ◽

Mixed Solutions

A basic sulfate precursor [Sc(OH)SO4·2H2O] for well-sinterable Sc2O3 powders was precipitated from mixed solutions of scandium nitrate [Sc(NO3)3] and ammonium sulfate [(NH4)2SO4] at room temperature and which was subsequently converted to Sc2O3 via dehydroxylization and desulfurization at temperatures ≥900 °C. With the reactive powders synthesized in this work, polycrystalline Sc2O3 ceramics showing high inline transmittances of approximately 70% in the visible wavelength region (corresponding to ∼90% of the theoretical value of single crystals) have been fabricated via vacuum sintering at a relatively low temperature of 1700 °C.

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Nd:YAG transparent ceramics fabricated by direct cold isostatic pressing and vacuum sintering

Optical Materials ◽

10.1016/j.optmat.2015.05.016 ◽

2015 ◽

Vol 50 ◽

pp. 25-31 ◽

Cited By ~ 18

Author(s):

Lin Ge ◽

Jiang Li ◽

Zhiwei Zhou ◽

Binglong Liu ◽

Tengfei Xie ◽

...

Keyword(s):

Cold Isostatic Pressing ◽

Transparent Ceramics ◽

Vacuum Sintering ◽

Isostatic Pressing

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Fabrication of Dy2O3 Transparent Ceramics by Vacuum Sintering Using Precipitated Powders

Magnetochemistry ◽

10.3390/magnetochemistry7010006 ◽

2020 ◽

Vol 7 (1) ◽

pp. 6

Author(s):

Dianjun Hu ◽

Xin Liu ◽

Ziyu Liu ◽

Xiaoying Li ◽

Feng Tian ◽

...

Keyword(s):

Near Infrared ◽

Optical Quality ◽

Precipitation Method ◽

Infrared Range ◽

Transparent Ceramics ◽

Vacuum Sintering ◽

Hydrogen Carbonate ◽

Ammonium Hydrogen ◽

Liquid Precipitation ◽

Near Infrared Range

As a kind of promising material for a Faraday isolator used in the visible and near infrared range, Dy2O3 transparent ceramics were prepared by vacuum sintering from the nano-powders synthesized by the liquid precipitation method using ammonium hydrogen carbonate as precipitant with no sintering aids. The synthesized precursor was calcinated at 950 °C–1150 °C for 4 h in air. The influences of the calcination temperature on the morphologies and phase composition of Dy2O3 powders were characterized. It is found that the Dy2O3 powder calcinated at 1000 °C for 4 h is superior for the fabrication of Dy2O3 ceramics. The Dy2O3 transparent ceramic sample prepared by vacuum sintering at 1850 °C for 10 h, and subsequently with air annealing at 1400 °C for 10 h, from the 1000 °C-calcined Dy2O3 powders, presents the best optical quality. The values of in-line transmittance of the optimal ceramic specimen with the thickness of 1.0 mm are 75.3% at 2000 nm and 67.9% at 633 nm. The Verdet constant of Dy2O3 ceramics was measured to be −325.3 ± 1.9 rad/(T·m) at 633 nm, about 2.4 times larger than that of TGG (Tb3Ga5O12) single crystals.

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Low‐temperature luminescent properties of degeneratep‐type GaAs grown by low‐pressure metalorganic chemical vapor deposition

Journal of Applied Physics ◽

10.1063/1.356283 ◽

1994 ◽

Vol 75 (4) ◽

pp. 2210-2214 ◽

Cited By ~ 13

Author(s):

H. D. Chen ◽

M. S. Feng ◽

P. A. Chen ◽

K. C. Lin ◽

C. C. Wu

Keyword(s):

Chemical Vapor Deposition ◽

Low Temperature ◽

Vapor Deposition ◽

Metalorganic Chemical Vapor Deposition ◽

Chemical Vapor ◽

Luminescent Properties ◽

Low Pressure ◽

Metalorganic Chemical

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Low Temperature Synthesis and Luminescent Properties of Ca2SnO4: Eu3

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.136.14 ◽

2010 ◽

Vol 136 ◽

pp. 14-17 ◽

Cited By ~ 1

Author(s):

Yu Zhong Li ◽

Xiao Chun Zhou

Keyword(s):

Low Temperature ◽

Spherical Shape ◽

Luminescent Properties ◽

Xrd Analysis ◽

Electric Dipole Transition ◽

Low Temperature Synthesis ◽

Temperature Synthesis ◽

X Ray ◽

Emission Transition ◽

Red Emitting Phosphor

A novel red emitting phosphor, Ca2SnO4: Eu3+, was prepared by the low temperature solid state reaction. X-ray powder diffraction (XRD) analysis confirmed the formation of Ca2SnO4: Eu3+. Scanning electron-microscopy (SEM) observation indicated a narrow size distribution of about 500 nm for the particles with spherical shape. Under 396 nm excitation, the Ca2SnO4: Eu3+ phosphor exhibits novel red emission at about 613 nm which is assigned to the 5D0→7F2 electric-dipole transition. Furthermore, the emission transition 5D0→7F2 has been found to be more prominent over the normal orange emission transition 5D0→7F1.

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