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- W2794591226 abstract "Abstract Photoluminescence excitation and emission spectra of new phosphate Ca8ZnEu(PO4)7 have been investigated. The influence of the composition on the luminescence intensity has been shown. The substitution of Zn2+ for Ca2+ in Ca9Eu(PO4)7 with the formation of Ca8ZnEu(PO4)7 leads to the increased emission intensity 5D0 → 7F2 by about 1.5 times and to decreased number of bands from three to one in the range of 5D0 → 7F0 transition. Conditions of preparation do not influence the luminescent properties and distribution of Eu3+ cations in the structure. DSC, SHG data and dielectric spectroscopy reveal that Ca8ZnEu(PO4)7 belongs to antiferroelectrics (Tc = 836 K). The first-order antiferroelectric/paraelectric transformations are accompanied by a changing symmetry (R 3 ¯ с to R 3 ¯ m). The structure of Ca8ZnEu(PO4)7 (sp. gr. R 3 ¯ с) was refined by the Rietveld method. The Zn2+ cations occupy the M5 site. The Eu3+ and Ca2+ ions are located in the M1 and M3 sites of β-Ca3(PO4)2-type structure." @default.
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- W2794591226 date "2018-08-01" @default.
- W2794591226 modified "2023-10-02" @default.
- W2794591226 title "Luminescence, structure and antiferroelectric-type phase transition in Ca8ZnEu(PO4)7" @default.
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- W2794591226 doi "https://doi.org/10.1016/j.materresbull.2018.03.052" @default.
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