NDLI: Effect of Er$^{3+}$ doping on the thermal stability of TiO$

Content Provider	Springer Nature Link
Author	Borlaf, Mario Colomer, María T. More, Rodrigo Ortiz, Angel L.
Copyright Year	2013
Abstract	The effect of Er$^{3+}$ doping on the thermal stability of TiO$_{2}$ nanoparticulate xerogels prepared by a colloidal sol–gel route was investigated. It was found that the as-synthesized xerogels crystallize as anatase phase with crystallite sizes in the low nanoscale range (<7 nm) and high-specific surface areas (>100 ± 5 m$^{2}$/g). Nevertheless, it was also found that the Er$^{3+}$ cations are deposited on the surface of TiO$_{2}$ nanocrystallites thus resulting in xerogels with smaller and more uniform nanoaggregates. Most importantly, detailed analyses using X-ray thermo-diffractometry together with selective analyses by transmission electron microscopy, selected area electron diffractometry, and X-ray energy-dispersive spectrometry showed that the thermal stability of these TiO$_{2}$ nanoparticulate xerogels increases with increasing Er$^{3+}$ doping. Specifically, the nanocrystallite growth is slowed down, the onset temperature of the anatase-to-rutile phase transformation is delayed, and the anatase phase is retained up to greater temperatures as the Er$^{3+}$ content increases, which are all phenomena attributable to the formation at low temperatures (i.e. ~200 °C) of solid solutions with Er$^{3+}$ solutes within the TiO$_{2}$ host. Moreover, these solid solutions also have lower thermal expansion coefficient than the undoped crystal structure. Finally, Er$^{3+}$ doping increasingly promotes the precipitation at high temperatures of Er$_{2}$Ti$_{2}$O$_{7}$ from the rutile TiO$_{2}$ solid solution, with the precipitation temperature decreasing with increasing Er$^{3+}$ doping content.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	15
Issue Number	6
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-06-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TiO$_{2}$ Sol–gel Erbium doping Phase transformation Nanotechnology Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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