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KEu(MoO₄)₂: polymorphism, structures, and luminescent properties

Vladimir A Morozov, Alla V Arakcheeva, Philip Pattison, Katrien Meert, Philippe Smet UGent, Dirk Poelman UGent, Nicolas Gauquelin, Johan Verbeeck, Artem M Abakumov and Joke Hadermann (2015) CHEMISTRY OF MATERIALS. 27(16). p.5519-5530
abstract
In this paper, with the example of two different polymorphs of KEu(MoO4)(2), the influence of the ordering of the A-cations on the luminescent properties in scheelite related compounds (A',A '') [(B',B '')O-4](m) is investigated. The polymorphs were synthesized using a solid state method. The study confirmed the existence of only two polymorphic forms at annealing temperature range 923-1203 K and ambient pressure: a low temperature anorthic alpha-phase and a monoclinic high temperature beta-phase with an incommensurately modulated structure. The structures of both polymorphs were solved using transmission electron microscopy and refined from synchrotron powder X-ray diffraction data. The monoclinic beta-KEu(MoO4)(2) has a (3+1)-dimensional incommensurately modulated structure (superspace group I2/b(alpha beta 0)00, a = 5.52645(4) angstrom, b = 5.28277(4) angstrom, c = 11.73797(8) angstrom, gamma = 91.2189(4)degrees, q = 0.56821(2)a*-0.12388(3)b*), whereas the anorthic alpha-phase is (3+1)-dimensional commensurately modulated (superspace group I (1) over bar(alpha beta gamma)0, a = 5.58727(22) angstrom, b = 5.29188(18)angstrom, c = 11.7120(4) angstrom, alpha = 90.485(3)degrees, beta = 88.074(3)degrees, gamma = 91.0270(23)degrees, q = 1/2a* + 1/2c*). In both cases the modulation arises due to Eu/K cation ordering at the A site: the formation of a 2-dimensional Eu3+ network is characteristic for the alpha-phase, while a 3-dimensional Eu3+-framework is observed for the beta-phase structure. The luminescent properties of KEu(MoO4)(2) samples prepared under different annealing conditions were measured, and the relation between their optical properties and their structures is discussed.
Please use this url to cite or link to this publication:
author
organization
alternative title
KEu(MoO4)(2) : polymorphism, structures, and luminescent properties
year
type
journalArticle (original)
publication status
published
subject
keyword
DIFFRACTION, MOLYBDATES, TRANSITIONS, PHOTOLUMINESCENCE, GROWTH, RED PHOSPHORS, SINGLE-CRYSTALS, SOLID-STATE REACTION, CRYSTAL-STRUCTURE
journal title
CHEMISTRY OF MATERIALS
Chem. Mat.
volume
27
issue
16
pages
5519 - 5530
Web of Science type
Article
Web of Science id
000360323700011
JCR category
MATERIALS SCIENCE, MULTIDISCIPLINARY
JCR impact factor
9.407 (2015)
JCR rank
15/271 (2015)
JCR quartile
1 (2015)
ISSN
0897-4756
DOI
10.1021/acs.chemmater.5b01622
project
Center for nano- and biophotonics (NB-Photonics)
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
7024975
handle
http://hdl.handle.net/1854/LU-7024975
date created
2016-01-05 12:47:15
date last changed
2016-12-19 15:47:33
@article{7024975,
  abstract     = {In this paper, with the example of two different polymorphs of KEu(MoO4)(2), the influence of the ordering of the A-cations on the luminescent properties in scheelite related compounds (A',A '') [(B',B '')O-4](m) is investigated. The polymorphs were synthesized using a solid state method. The study confirmed the existence of only two polymorphic forms at annealing temperature range 923-1203 K and ambient pressure: a low temperature anorthic alpha-phase and a monoclinic high temperature beta-phase with an incommensurately modulated structure. The structures of both polymorphs were solved using transmission electron microscopy and refined from synchrotron powder X-ray diffraction data. The monoclinic beta-KEu(MoO4)(2) has a (3+1)-dimensional incommensurately modulated structure (superspace group I2/b(alpha beta 0)00, a = 5.52645(4) angstrom, b = 5.28277(4) angstrom, c = 11.73797(8) angstrom, gamma = 91.2189(4)degrees, q = 0.56821(2)a*-0.12388(3)b*), whereas the anorthic alpha-phase is (3+1)-dimensional commensurately modulated (superspace group I (1) over bar(alpha beta gamma)0, a = 5.58727(22) angstrom, b = 5.29188(18)angstrom, c = 11.7120(4) angstrom, alpha = 90.485(3)degrees, beta = 88.074(3)degrees, gamma = 91.0270(23)degrees, q = 1/2a* + 1/2c*). In both cases the modulation arises due to Eu/K cation ordering at the A site: the formation of a 2-dimensional Eu3+ network is characteristic for the alpha-phase, while a 3-dimensional Eu3+-framework is observed for the beta-phase structure. The luminescent properties of KEu(MoO4)(2) samples prepared under different annealing conditions were measured, and the relation between their optical properties and their structures is discussed.},
  author       = {Morozov, Vladimir A and Arakcheeva, Alla V and Pattison, Philip and Meert, Katrien and Smet, Philippe and Poelman, Dirk and Gauquelin, Nicolas and Verbeeck, Johan and Abakumov, Artem M and Hadermann, Joke},
  issn         = {0897-4756},
  journal      = {CHEMISTRY OF MATERIALS},
  keyword      = {DIFFRACTION,MOLYBDATES,TRANSITIONS,PHOTOLUMINESCENCE,GROWTH,RED PHOSPHORS,SINGLE-CRYSTALS,SOLID-STATE REACTION,CRYSTAL-STRUCTURE},
  language     = {eng},
  number       = {16},
  pages        = {5519--5530},
  title        = {KEu(MoO\unmatched{2084})\unmatched{2082}: polymorphism, structures, and luminescent properties},
  url          = {http://dx.doi.org/10.1021/acs.chemmater.5b01622},
  volume       = {27},
  year         = {2015},
}

Chicago
Morozov, Vladimir A, Alla V Arakcheeva, Philip Pattison, Katrien Meert, Philippe Smet, Dirk Poelman, Nicolas Gauquelin, Johan Verbeeck, Artem M Abakumov, and Joke Hadermann. 2015. “KEu(MoO₄)₂: Polymorphism, Structures, and Luminescent Properties.” Chemistry of Materials 27 (16): 5519–5530.
APA
Morozov, V. A., Arakcheeva, A. V., Pattison, P., Meert, K., Smet, P., Poelman, D., Gauquelin, N., et al. (2015). KEu(MoO₄)₂: polymorphism, structures, and luminescent properties. CHEMISTRY OF MATERIALS, 27(16), 5519–5530.
Vancouver
1.
Morozov VA, Arakcheeva AV, Pattison P, Meert K, Smet P, Poelman D, et al. KEu(MoO₄)₂: polymorphism, structures, and luminescent properties. CHEMISTRY OF MATERIALS. 2015;27(16):5519–30.
MLA
Morozov, Vladimir A, Alla V Arakcheeva, Philip Pattison, et al. “KEu(MoO₄)₂: Polymorphism, Structures, and Luminescent Properties.” CHEMISTRY OF MATERIALS 27.16 (2015): 5519–5530. Print.