skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Phase identification and structure investigation of novel quaternary rare-earth substituted titanates

Abstract

Novel quaternary lanthanide-substituted oxides of stoichiometry LnxY2-xTi2O7 (where Ln is lanthanum, neodymium, samarium, gadolinium, or ytterbium) were prepared by traditional high-temperature, solid-state techniques and characterized by X-ray powder diffraction. Samples with nominal values of x up to 1.0 were attempted. The well-studied ternary cubic pyrochlore compound yttrium titanium oxide (Y2Ti2O7, space group Fd-3m, Z = 8), served as a parent structural framework in which Ln3+ cations were substituted on the Y3+ site. Laboratory-grade X-ray powder diffraction data revealed pure quaternary pyrochlore phases for LnxY2-xTi2O7 with x ≤ 0.2. Pyrochlore phase purity was verified by Rietveld analysis using high-resolution synchrotron X-ray powder diffraction data when x ≤ 0.2, however, for La3+ substitution specifically, pure quaternary pyrochlore formed at x<0.1. Band gap energies on selected samples were determined using optical diffuse reflectance spectroscopy and showed that these materials can be classified as electrical insulators with indirect band gap energies around 3.7 eV.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
UNIVERSITY
OSTI Identifier:
1404971
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 256; Journal Issue: C
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Aldridge, James D., Womick, Jordan M., Rosmus, Kimberly A., Weiland, Ashley, Aitken, Jennifer A., and Polvani, Deborah A.. Phase identification and structure investigation of novel quaternary rare-earth substituted titanates. United States: N. p., 2017. Web. doi:10.1016/j.jssc.2017.08.030.
Aldridge, James D., Womick, Jordan M., Rosmus, Kimberly A., Weiland, Ashley, Aitken, Jennifer A., & Polvani, Deborah A.. Phase identification and structure investigation of novel quaternary rare-earth substituted titanates. United States. doi:10.1016/j.jssc.2017.08.030.
Aldridge, James D., Womick, Jordan M., Rosmus, Kimberly A., Weiland, Ashley, Aitken, Jennifer A., and Polvani, Deborah A.. Fri . "Phase identification and structure investigation of novel quaternary rare-earth substituted titanates". United States. doi:10.1016/j.jssc.2017.08.030.
@article{osti_1404971,
title = {Phase identification and structure investigation of novel quaternary rare-earth substituted titanates},
author = {Aldridge, James D. and Womick, Jordan M. and Rosmus, Kimberly A. and Weiland, Ashley and Aitken, Jennifer A. and Polvani, Deborah A.},
abstractNote = {Novel quaternary lanthanide-substituted oxides of stoichiometry LnxY2-xTi2O7 (where Ln is lanthanum, neodymium, samarium, gadolinium, or ytterbium) were prepared by traditional high-temperature, solid-state techniques and characterized by X-ray powder diffraction. Samples with nominal values of x up to 1.0 were attempted. The well-studied ternary cubic pyrochlore compound yttrium titanium oxide (Y2Ti2O7, space group Fd-3m, Z = 8), served as a parent structural framework in which Ln3+ cations were substituted on the Y3+ site. Laboratory-grade X-ray powder diffraction data revealed pure quaternary pyrochlore phases for LnxY2-xTi2O7 with x ≤ 0.2. Pyrochlore phase purity was verified by Rietveld analysis using high-resolution synchrotron X-ray powder diffraction data when x ≤ 0.2, however, for La3+ substitution specifically, pure quaternary pyrochlore formed at x<0.1. Band gap energies on selected samples were determined using optical diffuse reflectance spectroscopy and showed that these materials can be classified as electrical insulators with indirect band gap energies around 3.7 eV.},
doi = {10.1016/j.jssc.2017.08.030},
journal = {Journal of Solid State Chemistry},
number = C,
volume = 256,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 2017},
month = {Fri Dec 01 00:00:00 EST 2017}
}