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- W2894482996 abstract "Eight new phases with the general formula of ABC3O11 with different rare earth, (Zr, Hf), (Nb, Ta) combinations, have been prepared by solid-state reactions at a temperature range of 1200–1500 °C. The new phases—LaHfTa, LaHfNb, LaZrNb, PrHfTa, NdHfTa, NdHfNb, SmHfTa and GdHfTa—are characterised by X-ray and neutron diffraction data at room temperature and variable frequency impedance measurements. They are isostructural with LaZrTa3O11 which consist of alternating single layers of UO7 pentagonal bipyramids and octahedra as shown by Rietveld refinement of X-ray and neutron powder diffraction data. Lattice parameters decrease with decreasing size of rare earth element substitution at A-site, and of all, Gd is the smallest rare earth that formed LaZrTa3O11 analogues. Detailed attempts of attained and unattainable LaZrTa3O11 analogues with different temperatures are included in this paper. All phases are highly insulating with temperature-independent bulk permittivities in the range 17 to 50; LaHfNb demonstrates the highest permittivity. Arrhenius plot shows that the activation energies are in the range 0.8 to 1.94 eV." @default.
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- W2894482996 date "2018-09-24" @default.
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- W2894482996 title "Synthesis, structure and dielectric properties of a new family of phases, ABC3O11: A = La, Pr, Nd, Sm, Gd; B = Zr, Hf; C = Ta, Nb" @default.
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- W2894482996 doi "https://doi.org/10.1007/s41779-018-0236-x" @default.
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