NDLI: Effect of Gd$^{3+}$ Ion Insertion on the Crystal Structure, Photoluminescence, and Dielectric Properties of o-Mullite Nanoparticles

Content Provider	Springer Nature Link
Author	Sanad, M. M. S. Rashad, M. M. Abdel Aal, E. A. El Shahat, M. F. Powers, K.
Copyright Year	2014
Abstract	Nanocrystalline Gd$^{3+}$-doped Gd$_{ x }$Al$_{6−x }$Si$_{2}$O$_{13}$ mullite powders with x from 0.005 to 0.025 have been synthesized via a facile coprecipitation technique. X-ray diffraction results revealed that o-mullite was detected as the major phase for x = 0.0 to 0.01, whereas corundum α-Al$_{2}$O$_{3}$ was predominant for x = 0.025. It was found that the volume of the mullite unit cell increased with Gd$^{3+}$ ion incorporation. Differential scanning calorimetry thermograms evinced that the exothermic peak temperature of mullite shifted to lower values with Gd$^{3+}$ ion insertion. Transmission electron microscopy observations of pure mullite nanoparticles displayed orthorhombic-like shapes. Meanwhile, at 0.5% Gd$^{3+}$ ion content, the mullite particles exhibited platelet-like shapes, which distorted into spheroidal-like crystals at high Gd$^{3+}$ ion contents (1% and 2.5%). The photoluminescence spectra indicated that the intensity of the emission spectra improved considerably with Gd$^{3+}$ ion doping. On the other hand, dielectric measurements of sintered samples showed that the maximum dielectric loss values were 1.7 and 1.4 at 1.5 MHz and 1.5 GHz, respectively, with 2.5% Gd$^{3+}$ ion content.
Starting Page	3559
Ending Page	3566
Page Count	8
File Format	PDF
ISSN	03615235
Journal	Journal of Electronic Materials
Volume Number	43
Issue Number	9
e-ISSN	1543186X
Language	English
Publisher	Springer US
Publisher Date	2014-06-04
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	o-Mullite nanoparticles FT-IR photoluminescence dielectric permittivity lattice parameters Optical and Electronic Materials Characterization and Evaluation of Materials Electronics and Microelectronics, Instrumentation Solid State Physics
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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