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- W2033969952 abstract "A structural transition in rare earth pyrohafnates, Ln2Hf2O7 (Ln=Y, La, Pr, Nd, Tb, Dy, Yb and Lu), has been identified. Neutron diffraction showed that the structure transforms from well-ordered pyrochloric to fully fluoritic through the lanthanide series from La to Lu with a corresponding increase in the position parameter x of the 48f (Fd 3¯ m) oxygen site from 0.330 to 0.375. As evidenced by the selected area electron diffraction, La2Hf2O7, Pr2Hf2O7 and Nd2Hf2O7 exhibited a well-ordered pyrocholoric structure with the presence of intense superlattice spots, which became weak and diffuse (in Dy2Hf2O7 and Tb2Hf2O7) before disappearing completely as the series progressed towards the Lu end. High resolution electron microscopic studies showed the breakdown of the pyrochlore ordering in the form of antiphase domains resulting in diffused smoke-like superlattice spots in the case of Dy2Hf2O7 and Tb2Hf2O7." @default.
- W2033969952 created "2016-06-24" @default.
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- W2033969952 date "2012-10-01" @default.
- W2033969952 modified "2023-10-18" @default.
- W2033969952 title "Transmission electron microscopic study of pyrochlore to defect-fluorite transition in rare-earth pyrohafnates" @default.
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- W2033969952 doi "https://doi.org/10.1016/j.jssc.2012.05.008" @default.
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