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

Abstract

Highlights: • Thermal, dielectric and luminescence properties were obtained for Ca{sub 8}ZnEu(PO{sub 4}){sub 7}. • Ca{sub 8}ZnEu(PO{sub 4}){sub 7} belongs to antiferroelectric with T{sub c} = 836 K. • First-order antiferroelectric/paraelectric phase transitions have been found. • Influence of composition on the luminescence properties has been shown. • Structure of Ca{sub 8}ZnEu(PO{sub 4}){sub 7} was refined by the Rietveld method. - Abstract: Photoluminescence excitation and emission spectra of new phosphate Ca{sub 8}ZnEu(PO{sub 4}){sub 7} have been investigated. The influence of the composition on the luminescence intensity has been shown. The substitution of Zn{sup 2+} for Ca{sup 2+} in Ca{sub 9}Eu(PO{sub 4}){sub 7} with the formation of Ca{sub 8}ZnEu(PO{sub 4}){sub 7} leads to the increased emission intensity {sup 5}D{sub 0} → {sup 7}F{sub 2} by about 1.5 times and to decreased number of bands from three to one in the range of {sup 5}D{sub 0} → {sup 7}F{sub 0} transition. Conditions of preparation do not influence the luminescent properties and distribution of Eu{sup 3+} cations in the structure. DSC, SHG data and dielectric spectroscopy reveal that Ca{sub 8}ZnEu(PO{sub 4}){sub 7} belongs to antiferroelectrics (T{sub c} = 836 K). The first-order antiferroelectric/paraelectric transformations are accompanied by a changing symmetry (R3-barC to R3-barm).more » The structure of Ca{sub 8}ZnEu(PO{sub 4}){sub 7} (sp. gr. R3-barc) was refined by the Rietveld method. The Zn{sup 2+} cations occupy the M5 site. The Eu{sup 3+} and Ca{sup 2+} ions are located in the M1 and M3 sites of β-Ca{sub 3}(PO{sub 4}){sub 2}-type structure.« less

Authors:
;  [1];  [2];  [3];  [1]; ; ;  [1]
  1. Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow (Russian Federation)
  2. Research Center for Functional Materials, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki, 305-0044 (Japan)
  3. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, 620990, Ekaterinburg (Russian Federation)
Publication Date:
OSTI Identifier:
22805144
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 104; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROELECTRIC MATERIALS; CALCIUM IONS; CALORIMETRY; CATIONS; CRYSTAL STRUCTURE; DIELECTRIC PROPERTIES; EMISSION SPECTRA; EUROPIUM IONS; EXCITATION; PHASE TRANSFORMATIONS; PHOSPHATES; PHOTOLUMINESCENCE; SPECTROSCOPY; ZINC IONS

Citation Formats

Lazoryak, Bogdan I., E-mail: lazoryak@tech.chem.msu.ru, Zhukovskaya, Evgeniya S., Baryshnikova, Oksana V., Belik, Alexei A., Leonidova, Olga N., Deyneko, Dina V., Savon, Alexander E., Dorbakov, Nikolai G., and Morozov, Vladimir A. Luminescence, structure and antiferroelectric-type phase transition in Ca8ZnEu(PO4)7. United States: N. p., 2018. Web. doi:10.1016/J.MATERRESBULL.2018.03.052.
Lazoryak, Bogdan I., E-mail: lazoryak@tech.chem.msu.ru, Zhukovskaya, Evgeniya S., Baryshnikova, Oksana V., Belik, Alexei A., Leonidova, Olga N., Deyneko, Dina V., Savon, Alexander E., Dorbakov, Nikolai G., & Morozov, Vladimir A. Luminescence, structure and antiferroelectric-type phase transition in Ca8ZnEu(PO4)7. United States. https://doi.org/10.1016/J.MATERRESBULL.2018.03.052
Lazoryak, Bogdan I., E-mail: lazoryak@tech.chem.msu.ru, Zhukovskaya, Evgeniya S., Baryshnikova, Oksana V., Belik, Alexei A., Leonidova, Olga N., Deyneko, Dina V., Savon, Alexander E., Dorbakov, Nikolai G., and Morozov, Vladimir A. Wed . "Luminescence, structure and antiferroelectric-type phase transition in Ca8ZnEu(PO4)7". United States. https://doi.org/10.1016/J.MATERRESBULL.2018.03.052.
@article{osti_22805144,
title = {Luminescence, structure and antiferroelectric-type phase transition in Ca8ZnEu(PO4)7},
author = {Lazoryak, Bogdan I., E-mail: lazoryak@tech.chem.msu.ru and Zhukovskaya, Evgeniya S. and Baryshnikova, Oksana V. and Belik, Alexei A. and Leonidova, Olga N. and Deyneko, Dina V. and Savon, Alexander E. and Dorbakov, Nikolai G. and Morozov, Vladimir A.},
abstractNote = {Highlights: • Thermal, dielectric and luminescence properties were obtained for Ca{sub 8}ZnEu(PO{sub 4}){sub 7}. • Ca{sub 8}ZnEu(PO{sub 4}){sub 7} belongs to antiferroelectric with T{sub c} = 836 K. • First-order antiferroelectric/paraelectric phase transitions have been found. • Influence of composition on the luminescence properties has been shown. • Structure of Ca{sub 8}ZnEu(PO{sub 4}){sub 7} was refined by the Rietveld method. - Abstract: Photoluminescence excitation and emission spectra of new phosphate Ca{sub 8}ZnEu(PO{sub 4}){sub 7} have been investigated. The influence of the composition on the luminescence intensity has been shown. The substitution of Zn{sup 2+} for Ca{sup 2+} in Ca{sub 9}Eu(PO{sub 4}){sub 7} with the formation of Ca{sub 8}ZnEu(PO{sub 4}){sub 7} leads to the increased emission intensity {sup 5}D{sub 0} → {sup 7}F{sub 2} by about 1.5 times and to decreased number of bands from three to one in the range of {sup 5}D{sub 0} → {sup 7}F{sub 0} transition. Conditions of preparation do not influence the luminescent properties and distribution of Eu{sup 3+} cations in the structure. DSC, SHG data and dielectric spectroscopy reveal that Ca{sub 8}ZnEu(PO{sub 4}){sub 7} belongs to antiferroelectrics (T{sub c} = 836 K). The first-order antiferroelectric/paraelectric transformations are accompanied by a changing symmetry (R3-barC to R3-barm). The structure of Ca{sub 8}ZnEu(PO{sub 4}){sub 7} (sp. gr. R3-barc) was refined by the Rietveld method. The Zn{sup 2+} cations occupy the M5 site. The Eu{sup 3+} and Ca{sup 2+} ions are located in the M1 and M3 sites of β-Ca{sub 3}(PO{sub 4}){sub 2}-type structure.},
doi = {10.1016/J.MATERRESBULL.2018.03.052},
url = {https://www.osti.gov/biblio/22805144}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 104,
place = {United States},
year = {2018},
month = {8}
}