Structural Effects of Lanthanide Dopants on Alumina
Abstract
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. In addition, 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. Lastly, this study opens up the potential to control the structure and phase composition of Ln-doped alumina for emerging applications.
- Authors:
-
- Temple University, Philadelphia, PA (United States). Department of Mechanical Engineering and Temple Materials Institute
- US Army Research Laboratory, Aberdeen Proving Ground, MD (United States)
- Univ. of Kansas, Lawrence, KS (United States). Molecular Structures Group
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1338553
- Grant/Contract Number:
- AC05-00OR22725; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 7; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Synthesis and processing
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. https://doi.org/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. https://doi.org/10.1038/srep39946. https://www.osti.gov/servlets/purl/1338553.
@article{osti_1338553,
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. In addition, 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. Lastly, 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 = ,
volume = 7,
place = {United States},
year = {Fri Jan 06 00:00:00 EST 2017},
month = {Fri Jan 06 00:00:00 EST 2017}
}
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