Symmetry and light stuffing of Ho2Ti2O7, Er2Ti2O7 , and Yb2Ti2O7 characterized by synchrotron x-ray diffraction

Baroudi, Kristen; Gaulin, Bruce D.; Lapidus, Saul H.; Gaudet, Jonathan; Cava, R. J.

doi:10.1103/PhysRevB.92.024110

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

Journal Article · Wed Jul 01 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.024110· OSTI ID:1392029

Baroudi, Kristen; Gaulin, Bruce D.; Lapidus, Saul H.; Gaudet, Jonathan; Cava, R. J.

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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1392029

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 2; ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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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