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Title: Structural Effects of Lanthanide Dopants on Alumina

Abstract

Lanthanide (Ln 3+) doping in alumina has shown great promise for stabilizing and promoting desirable phase formation to achieve optimized physical and chemical properties. However, doping alumina with Ln elements is generally accompanied by formation of new phases (i.e. LnAlO3, Ln2O3), and therefore inclusion of Ln-doping mechanisms for phase stabilization of the alumina lattice is indispensable. In this study, Ln-doping (400 ppm) of the alumina lattice crucially delays the onset of phase transformation and enables phase population control, which is achieved without the formation of new phases. The delay in phase transition (θ → α), and alteration of powder morphology, particle dimensions, and composition ratios between α- and θ-alumina phases are studied using a combination of solid state nuclear magnetic resonance, electron microscopy, digital scanning calorimetry, and high resolution X-ray diffraction with refinement fitting. Loading alumina with a sparse concentration of Ln-dopants suggests that the dopants reside in the vacant octahedral locations within the alumina lattice, where complete conversion into the thermodynamically stable α-domain is shown in dysprosium (Dy)- and lutetium (Lu)-doped alumina. This study opens up the potential to control the structure and phase composition of Ln-doped alumina for emerging applications.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1338998
Resource Type:
Journal Article
Resource Relation:
Journal Name: Scientific Reports; Journal Volume: 7; Journal Issue: 01, 2017
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Patel, Ketan, Blair, Victoria, Douglas, Justin, Dai, Qilin, Liu, Yaohua, Ren, Shenqiang, and Brennan, Raymond. Structural Effects of Lanthanide Dopants on Alumina. United States: N. p., 2017. Web. doi:10.1038/srep39946.
Patel, Ketan, Blair, Victoria, Douglas, Justin, Dai, Qilin, Liu, Yaohua, Ren, Shenqiang, & Brennan, Raymond. Structural Effects of Lanthanide Dopants on Alumina. United States. doi:10.1038/srep39946.
Patel, Ketan, Blair, Victoria, Douglas, Justin, Dai, Qilin, Liu, Yaohua, Ren, Shenqiang, and Brennan, Raymond. Fri . "Structural Effects of Lanthanide Dopants on Alumina". United States. doi:10.1038/srep39946.
@article{osti_1338998,
title = {Structural Effects of Lanthanide Dopants on Alumina},
author = {Patel, Ketan and Blair, Victoria and Douglas, Justin and Dai, Qilin and Liu, Yaohua and Ren, Shenqiang and Brennan, Raymond},
abstractNote = {Lanthanide (Ln3+) doping in alumina has shown great promise for stabilizing and promoting desirable phase formation to achieve optimized physical and chemical properties. However, doping alumina with Ln elements is generally accompanied by formation of new phases (i.e. LnAlO3, Ln2O3), and therefore inclusion of Ln-doping mechanisms for phase stabilization of the alumina lattice is indispensable. In this study, Ln-doping (400 ppm) of the alumina lattice crucially delays the onset of phase transformation and enables phase population control, which is achieved without the formation of new phases. The delay in phase transition (θ → α), and alteration of powder morphology, particle dimensions, and composition ratios between α- and θ-alumina phases are studied using a combination of solid state nuclear magnetic resonance, electron microscopy, digital scanning calorimetry, and high resolution X-ray diffraction with refinement fitting. Loading alumina with a sparse concentration of Ln-dopants suggests that the dopants reside in the vacant octahedral locations within the alumina lattice, where complete conversion into the thermodynamically stable α-domain is shown in dysprosium (Dy)- and lutetium (Lu)-doped alumina. This study opens up the potential to control the structure and phase composition of Ln-doped alumina for emerging applications.},
doi = {10.1038/srep39946},
journal = {Scientific Reports},
number = 01, 2017,
volume = 7,
place = {United States},
year = {Fri Jan 06 00:00:00 EST 2017},
month = {Fri Jan 06 00:00:00 EST 2017}
}