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- W2127059998 abstract "Abstract Na5W3O9F5 is a coupled ferroelectric-ferroelastic with a structure at 295 K that consists of three symmetry-independent corner-sharing W-(O, F)6 octahedra separated by three independent Na cations in a monoclinic unit cell with a = 7.3597(7), b = 10.6342(15), c = 7.3618(10) Å and β = 90.77° (based on previous single crystal measurements). Phase transitions have been reported at about 200, 530 and 800 K. The powder diffraction pattern of Na5W3O9F5 has been measured with X-rays and neutrons over a wide thermal range and the structure at 20, 90, 160, 230, 300, 455, 563, 700 and 741 K determined by means of profile analysis. The lattice constants vary monotonically through the lowest temperature transition but exhibit inflections at about 500 K. The tilt angle between two independent W-(O, F)6 octahedra, related to the order-parameter, varies from 35° at 5 K to 7° at the highest transition (the Curie temperature). The rotation of the remaining octahedron about the a axis varies from 15° at 5 K to zero at about 500 K, the intermediate transition. The atomic coordinates exhibit small but significant discontinuities at both lower temperature phase transitions." @default.
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- W2127059998 date "1991-04-01" @default.
- W2127059998 modified "2023-09-25" @default.
- W2127059998 title "Structural study of the Na5W3O9F5phase transitions by X-ray and neutron diffraction" @default.
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- W2127059998 doi "https://doi.org/10.1080/01411599108207713" @default.
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