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

Title: Symmetry and light stuffing of H o 2 T i 2 O 7 ,   E r 2 T i 2 O 7 , and Y b 2 T i 2 O 7 characterized by synchrotron x-ray diffraction

Abstract

The Ho2Ti2O7, Er2Ti2O7 and Yb2Ti2O7 pyrochlores were studied by synchrotron X-ray diffraction to determine whether the (002) peak, forbidden in the pyrochlore space group Fd-3m but observed in single crystal neutron scattering measurements, is present due to a deviation of their pyrochlore structure from Fd-3m symmetry. Synchrotron diffraction measurements on precisely synthesized stoichiometric and non-stoichiometric powders and a crushed floating zone crystal of Ho2Ti2O7 revealed that the (002) reflection is absent in all cases to a sensitivity of approximately one part in 30,000 of the strongest X-ray diffraction peak. This indicates to high sensitivity that the structural space group of these rare earth titanate pyrochlores is Fd-3m, and that thus the (002) peak observed in the neutron scattering experiments has a non-structural origin. The cell parameters and internal strain for lightly stuffed Ho2+xTi2-xO7 are also presented.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1392029
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 92; Journal Issue: 2
Country of Publication:
United States
Language:
English

Citation Formats

Baroudi, Kristen, Gaulin, Bruce D., Lapidus, Saul H., Gaudet, Jonathan, and Cava, R. J.. Symmetry and light stuffing of Ho2Ti2O7, Er2Ti2O7 , and Yb2Ti2O7 characterized by synchrotron x-ray diffraction. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.024110.
Baroudi, Kristen, Gaulin, Bruce D., Lapidus, Saul H., Gaudet, Jonathan, & Cava, R. J.. Symmetry and light stuffing of Ho2Ti2O7, Er2Ti2O7 , and Yb2Ti2O7 characterized by synchrotron x-ray diffraction. United States. doi:10.1103/PhysRevB.92.024110.
Baroudi, Kristen, Gaulin, Bruce D., Lapidus, Saul H., Gaudet, Jonathan, and Cava, R. J.. Wed . "Symmetry and light stuffing of Ho2Ti2O7, Er2Ti2O7 , and Yb2Ti2O7 characterized by synchrotron x-ray diffraction". United States. doi:10.1103/PhysRevB.92.024110.
@article{osti_1392029,
title = {Symmetry and light stuffing of Ho2Ti2O7, Er2Ti2O7 , and Yb2Ti2O7 characterized by synchrotron x-ray diffraction},
author = {Baroudi, Kristen and Gaulin, Bruce D. and Lapidus, Saul H. and Gaudet, Jonathan and Cava, R. J.},
abstractNote = {The Ho2Ti2O7, Er2Ti2O7 and Yb2Ti2O7 pyrochlores were studied by synchrotron X-ray diffraction to determine whether the (002) peak, forbidden in the pyrochlore space group Fd-3m but observed in single crystal neutron scattering measurements, is present due to a deviation of their pyrochlore structure from Fd-3m symmetry. Synchrotron diffraction measurements on precisely synthesized stoichiometric and non-stoichiometric powders and a crushed floating zone crystal of Ho2Ti2O7 revealed that the (002) reflection is absent in all cases to a sensitivity of approximately one part in 30,000 of the strongest X-ray diffraction peak. This indicates to high sensitivity that the structural space group of these rare earth titanate pyrochlores is Fd-3m, and that thus the (002) peak observed in the neutron scattering experiments has a non-structural origin. The cell parameters and internal strain for lightly stuffed Ho2+xTi2-xO7 are also presented.},
doi = {10.1103/PhysRevB.92.024110},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 2,
volume = 92,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 2015},
month = {Wed Jul 01 00:00:00 EDT 2015}
}