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- W2412933407 abstract "The crystal structure and thermal expansion behaviors of a new tetragonal tungsten bronze (TTB) ferroelectric, Pb2K(0.5)Li(0.5)Nb5O15, were systematically investigated by selected-area electron diffraction (SAED), neutron powder diffraction, synchrotron X-ray diffraction (XRD), and high-temperature XRD. SAED and Rietveld refinement reveal that Pb2K(0.5)Li(0.5)Nb5O15 displays a commensurate superstructure of simple orthorhombic TTB structure at room temperature. The structure can be described with space group Bb2₁m. The transition to a paraelectric phase (P4/mbm) occurs at 500 °C. Compared with Pb2KNb5O15 (PKN), the substitution of 0.5K(+) with small 0.5Li(+) into PKN causes the tilting of NbO6 octahedra away from the c axis with Δθ ≈ 10° and raises the Curie temperature by 40 °C, and the negative thermal expansion coefficient along the polar b axis increases more than 50% in the temperature range 25-500 °C. We present that, by introduction of Li(+), the enhanced spontaneous polarization is responsible for the enhanced negative thermal expansion along the b axis, which may be caused by more Pb(2+) in the pentagonal caves." @default.
- W2412933407 created "2016-06-24" @default.
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- W2412933407 date "2014-08-12" @default.
- W2412933407 modified "2023-10-17" @default.
- W2412933407 title "Ordered Structure and Thermal Expansion in Tungsten Bronze Pb<sub>2</sub>K<sub>0.5</sub>Li<sub>0.5</sub>Nb<sub>5</sub>O<sub>15</sub>" @default.
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- W2412933407 doi "https://doi.org/10.1021/ic501189n" @default.
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