Rare-earth-doped α′-Sialon ceramics with novel optical properties

1996 ◽  
Vol 11 (11) ◽  
pp. 2790-2794 ◽  
Author(s):  
B. S. B. Karunaratne ◽  
R. J. Lumby ◽  
M. H. Lewis
Keyword(s):  
Optical Properties ◽  
Thermal Properties ◽  
Rare Earth ◽  
Mechanical And Thermal Properties ◽  
Silicon Nitrides ◽  
Sintering Atmosphere ◽  
Oxidation Reduction ◽  
Reduction Mechanisms ◽  
First Time ◽  
Rare Earth Doped

A new phenomenon in the field of Sialon ceramics is reported which may lead to applications based on their optical or electronic properties in combination with their mechanical and thermal properties. For the first time a colored α′-Sialon ceramic has been synthesized, with relatively high optical transparency by careful control of the sintering atmosphere, and adding suitable rare earths as stabilizing cations. This compares with normal Sialons and silicon nitrides which are grey-black in color and are opaque. Oxidation/reduction mechanisms have been identified as an influence on the valence of the stabilizing cation, which is responsible for the unusual optical properties.

Host Size Effects on Optical Properties of Y2O3:Eu3+ and Gd2O3:Eu3+ Nanoparticles Synthesized by Laser Pyrolysis

2007 ◽  
Vol 128 ◽  
pp. 157-163 ◽  
Author(s):  
G. Ledoux ◽  
Yann Leconte ◽  
D. Amans ◽  
C. Dujardin ◽  
Lionel Combemale ◽  
...  
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Size Effects ◽  
Charge Transfer Band ◽  
Broad Band ◽  
Spectroscopic Properties ◽  
Laser Pyrolysis ◽  
Cubic Phases ◽  
First Time ◽  
Rare Earth Doped

Rare earth doped materials have many familiar applications (TV screens, solid lasers, scintillators…) thanks to their efficient and robust luminescence properties. In recent years, growing interest has been focused on the changes in their optical properties with the size of the host particles. In this work, nanomaterials were produced for the first time by using laser pyrolysis. Y, Gd, and Eu nitrates were dissolved in water and used as precursors. Cubic phases of Y2O3:Eu3+ and Gd2O3:Eu3+ were obtained with sizes ranging from 3 to 40 nm. The spectroscopic properties revealed a new and nanostructure-specific broad band in the excitation spectrum. The emission spectrum was found to be characteristic of nanostructured sesquioxides only when excited in this new band, which was finally assumed to be a new charge transfer band for the smallest nanoparticles in the sample.

Optical Properties of Rare Earth Doped SrS Phosphor: A Review

2016 ◽  
Vol 46 (2) ◽  
pp. 687-708 ◽  
Author(s):  
Ayush Khare ◽  
Shubhra Mishra ◽  
D. S. Kshatri ◽  
Sanjay Tiwari
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Rare Earth Doped

Structure and optical properties of rare earth doped Y2O3 waveguide films derived by sol–gel process

2004 ◽  
Vol 458 (1-2) ◽  
pp. 274-280 ◽  
Author(s):  
H. Guo ◽  
W. Zhang ◽  
L. Lou ◽  
A. Brioude ◽  
J. Mugnier
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Rare Earth Doped

Nanostructured rare earth doped Nb 2 O 5 : Structural, optical properties and their correlation with photonic applications

2016 ◽  
Vol 170 ◽  
pp. 707-717 ◽  
Author(s):  
Rafael Ramiro Pereira ◽  
Felipe Thomaz Aquino ◽  
Alban Ferrier ◽  
Philippe Goldner ◽  
Rogéria R. Gonçalves
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Rare Earth Doped

Thiamine hydrochloride (vitamin B1) as modifier agent for TiO2 nanoparticles and the optical, mechanical, and thermal properties of poly(vinyl chloride) composite films

RSC Advances ◽  
2016 ◽  
Vol 6 (95) ◽  
pp. 92596-92604 ◽  
Author(s):  
Shadpour Mallakpour ◽  
Marzieh Adnany Sadaty
Keyword(s):  
Optical Properties ◽  
Thermal Properties ◽  
Tio2 Nanoparticles ◽  
Vinyl Chloride ◽  
Composite Films ◽  
Vitamin B1 ◽  
Thiamine Hydrochloride ◽  
Mechanical And Thermal Properties ◽  
Poly Vinyl Chloride

In the present investigation, TiO2 nanoparticles (NPs) were used for improving the thermal, mechanical and optical properties of poly(vinyl chloride) (PVC) matrix.

Mechanical and thermophysical properties of rare-earth monopnictides

2016 ◽  
Vol 05 (03) ◽  
pp. 1650012
Author(s):  
Vyoma Bhalla ◽  
Devraj Singh ◽  
Sushil Kumar Jain
Keyword(s):  
Thermal Properties ◽  
Rare Earth ◽  
Thermophysical Properties ◽  
Nearest Neighbors ◽  
Mechanical And Thermal Properties ◽  
Ultrasonic Velocities ◽  
Temperature Dependent ◽  
Repulsive Potentials ◽  
Similar Materials ◽  
Hardness Values

The present paper addresses the temperature dependent elastic, mechanical and thermal properties of NaCl structure (B1 type) holmium monopnictides, HoX (X = N, P, As, Sb, Bi) computed using Coulomb and Born repulsive potentials extended up to second nearest neighbors. The second-order elastic constants (SOECs) of single crystals HoX are calculated as a function of temperature in the range 0–500[Formula: see text]K. The compounds under study are found to be brittle in nature. Beside these calculations, the theoretical hardness has been obtained for various rare-earth monopnictides using the elastic properties in the polycrystalline approach. The obtained hardness values indicate HoN to be hard, but cannot be considered super hard. The anisotropic nature of the chosen single crystal is an important physical quantity in studying the directional dependent thermal properties such as Debye temperature and thermal conductivity computed using ultrasonic velocities along different crystallographic directions. The obtained results are discussed in correlation with mechanical and thermophysical properties of similar materials.

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