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The Ho2Ti2O7, Er2Ti2O7 and Yb2Ti2O7 pyrochlores were studied by synchrotronX-ray diffraction to determine whether the (002) peak, forbidden in thepyrochlore space group Fd-3m but observed in single crystal neutron scatteringmeasurements, is present due to a deviation of their pyrochlore structure fromFd-3m symmetry. Synchrotron diffraction measurements on precisely synthesizedstoichiometric and non-stoichiometric powders and a crushed floating zonecrystal of Ho2Ti2O7 revealed that the (002) reflection is absent in all casesto a sensitivity of approximately one part in 30,000 of the strongest X-raydiffraction peak. This indicates to high sensitivity that the structural spacegroup of these rare earth titanate pyrochlores is Fd-3m, and that thus the(002) peak observed in the neutron scattering experiments has a non-structuralorigin. The cell parameters and internal strain for lightly stuffedHo2+xTi2-xO7 are also presented.

The symmetry and light stuffing of Ho2Ti2O7, Er2Ti2O7 and Yb2Ti2O7 characterized by synchrotron X-ray diffraction