Luminescence, structure and antiferroelectric-type phase transition in Ca8ZnEu(PO4)7

[Display omitted] •Thermal, dielectric and luminescence properties were obtained for Ca8ZnEu(PO4)7.•Ca8ZnEu(PO4)7 belongs to antiferroelectric with Tc  = 836 K.•First-order antiferroelectric/paraelectric phase transitions have been found.•Influence of composition on the luminescence properties has b...

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Bibliographic Details
Published in:Materials research bulletin 2018-08, Vol.104, p.20-26
Main Authors: Lazoryak, Bogdan I., Zhukovskaya, Evgeniya S., Baryshnikova, Oksana V., Belik, Alexei A., Leonidova, Olga N., Deyneko, Dina V., Savon, Alexander E., Dorbakov, Nikolai G., Morozov, Vladimir A.
Format: Article
Language:English
Subjects:
Antiferroelectric
ANTIFERROELECTRIC MATERIALS
CALCIUM IONS
CALORIMETRY
CATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL STRUCTURE
DIELECTRIC PROPERTIES
EMISSION SPECTRA
EUROPIUM IONS
EXCITATION
Luminescence
PHASE TRANSFORMATIONS
PHOSPHATES
PHOTOLUMINESCENCE
SPECTROSCOPY
Synchrotron radiation
ZINC IONS
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Summary:[Display omitted] •Thermal, dielectric and luminescence properties were obtained for Ca8ZnEu(PO4)7.•Ca8ZnEu(PO4)7 belongs to antiferroelectric with Tc  = 836 K.•First-order antiferroelectric/paraelectric phase transitions have been found.•Influence of composition on the luminescence properties has been shown.•Structure of Ca8ZnEu(PO4)7 was refined by the Rietveld method. 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 (R3¯с to R3¯m). The structure of Ca8ZnEu(PO4)7 (sp. gr. R3¯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.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2018.03.052