Symmetry and light stuffing of Ho sub(2) Ti sub(2) O sub(7), Er sub(2) Ti sub(2) O sub(7), and Yb sub(2) Ti sub(2) O sub(7) characterized by synchrotron x-ray diffraction
The Ho sub(2) Ti sub(2) O sub(7), Er sub(2) Ti sub(2) O sub(7), and Yb sub(2) Ti sub(2) O sub(7) 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 measuremen...
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| Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-07, Vol.92 (2) |
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| container_title | Physical review. B, Condensed matter and materials physics |
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| creator | Baroudi, Kristen Gaulin, Bruce D Lapidus, Saul H Gaudet, Jonathan Cava, R J |
| description | The Ho sub(2) Ti sub(2) O sub(7), Er sub(2) Ti sub(2) O sub(7), and Yb sub(2) Ti sub(2) O sub(7) 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 nonstoichiometric powders and a crushed floating zone crystal of Ho sub(2) Ti sub(2) O sub(7) 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 space group of the crystal structure of these rare earth titanate pyrochlores is Fd - 3m, and that, thus, the (002) peak observed in the neutron scattering experiments has a nonstructural origin. The cell parameters and internal strain for lightly stuffed Ho sub(2+x) Ti sub(2-x) O sub(7) are also presented. |
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Synchrotron diffraction measurements on precisely synthesized stoichiometric and nonstoichiometric powders and a crushed floating zone crystal of Ho sub(2) Ti sub(2) O sub(7) 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 space group of the crystal structure of these rare earth titanate pyrochlores is Fd - 3m, and that, thus, the (002) peak observed in the neutron scattering experiments has a nonstructural origin. The cell parameters and internal strain for lightly stuffed Ho sub(2+x) Ti sub(2-x) O sub(7) are also presented.</description><identifier>ISSN: 1098-0121</identifier><identifier>EISSN: 1550-235X</identifier><language>eng</language><subject>Condensed matter ; Diffraction ; Neutron scattering ; Pyrochlores ; Rare earth metals ; Symmetry ; Synchrotrons ; X-rays</subject><ispartof>Physical review. 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B, Condensed matter and materials physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Baroudi, Kristen</au><au>Gaulin, Bruce D</au><au>Lapidus, Saul H</au><au>Gaudet, Jonathan</au><au>Cava, R J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Symmetry and light stuffing of Ho sub(2) Ti sub(2) O sub(7), Er sub(2) Ti sub(2) O sub(7), and Yb sub(2) Ti sub(2) O sub(7) characterized by synchrotron x-ray diffraction</atitle><jtitle>Physical review. B, Condensed matter and materials physics</jtitle><date>2015-07-01</date><risdate>2015</risdate><volume>92</volume><issue>2</issue><issn>1098-0121</issn><eissn>1550-235X</eissn><abstract>The Ho sub(2) Ti sub(2) O sub(7), Er sub(2) Ti sub(2) O sub(7), and Yb sub(2) Ti sub(2) O sub(7) 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 nonstoichiometric powders and a crushed floating zone crystal of Ho sub(2) Ti sub(2) O sub(7) 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 space group of the crystal structure of these rare earth titanate pyrochlores is Fd - 3m, and that, thus, the (002) peak observed in the neutron scattering experiments has a nonstructural origin. The cell parameters and internal strain for lightly stuffed Ho sub(2+x) Ti sub(2-x) O sub(7) are also presented.</abstract></addata></record> |
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| language | eng |
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| source | American Physical Society Journals |
| subjects | Condensed matter Diffraction Neutron scattering Pyrochlores Rare earth metals Symmetry Synchrotrons X-rays |
| title | Symmetry and light stuffing of Ho sub(2) Ti sub(2) O sub(7), Er sub(2) Ti sub(2) O sub(7), and Yb sub(2) Ti sub(2) O sub(7) characterized by synchrotron x-ray diffraction |
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