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Title: Thermochemistry of La 1-xLn xPO 4-monazites ( Ln = Gd, Eu)

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1388346
DOE Contract Number:
SC0001089
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Thermodynamics; Journal Volume: 105; Journal Issue: C; Related Information: MSA partners with University of Notre Dame (lead); University of California, Davis; Florida State University; George Washington University; University of Michigan; University of Minnesota; Oak Ridge National Laboratory; Oregon state University; Rensselaer Polytechnic Institute; Savannah River National Laboratory
Country of Publication:
United States
Language:
English
Subject:
nuclear (including radiation effects), materials and chemistry by design, synthesis (novel materials), synthesis (self-assembly)

Citation Formats

Neumeier, Stefan, Kegler, Philip, Arinicheva, Yulia, Shelyug, Anna, Kowalski, Piotr M., Schreinemachers, Christian, Navrotsky, Alexandra, and Bosbach, Dirk. Thermochemistry of La1-xLnxPO4-monazites ( Ln = Gd, Eu). United States: N. p., 2017. Web. doi:10.1016/j.jct.2016.11.003.
Neumeier, Stefan, Kegler, Philip, Arinicheva, Yulia, Shelyug, Anna, Kowalski, Piotr M., Schreinemachers, Christian, Navrotsky, Alexandra, & Bosbach, Dirk. Thermochemistry of La1-xLnxPO4-monazites ( Ln = Gd, Eu). United States. doi:10.1016/j.jct.2016.11.003.
Neumeier, Stefan, Kegler, Philip, Arinicheva, Yulia, Shelyug, Anna, Kowalski, Piotr M., Schreinemachers, Christian, Navrotsky, Alexandra, and Bosbach, Dirk. Thu . "Thermochemistry of La1-xLnxPO4-monazites ( Ln = Gd, Eu)". United States. doi:10.1016/j.jct.2016.11.003.
@article{osti_1388346,
title = {Thermochemistry of La1-xLnxPO4-monazites ( Ln = Gd, Eu)},
author = {Neumeier, Stefan and Kegler, Philip and Arinicheva, Yulia and Shelyug, Anna and Kowalski, Piotr M. and Schreinemachers, Christian and Navrotsky, Alexandra and Bosbach, Dirk},
abstractNote = {},
doi = {10.1016/j.jct.2016.11.003},
journal = {Journal of Chemical Thermodynamics},
number = C,
volume = 105,
place = {United States},
year = {Thu Nov 02 00:00:00 EDT 2017},
month = {Thu Nov 02 00:00:00 EDT 2017}
}
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  • The crystal structure of the isomorphical rare earth borophosphate compounds, Ln{sub 7}O{sub 6}(BO{sub 3})(PO{sub 4}){sub 2} (Ln = La, Nd, Gd and Dy), has been studied by a combination of X-ray powder diffraction (XRD) and vibration spectroscopic techniques. The Raman and infrared spectra of these compounds have been investigated, and their interpretation is discussed on both theoretical and experimental bases. Assignments have been deduced from the systematic investigation of pure compounds and isotopic species. A comparison of vibrational frequencies in La, Na, Gd, and Dy borophosphates reveals that the internal vibrations of the BO{sub 2} and PO{sub 4} ions shiftmore » to higher frequency with the decrement of lattice parameters from La to Dy, indicating a strengthening of the phosporus-oxygen and boron-oxygen bonding.« less
  • Graphical abstract: Display Omitted Highlights: ► We report the VUV spectroscopic properties of rare-earth ions in K{sub 2}LnZr(PO{sub 4}){sub 3}. ► The O{sup 2−}-Eu{sup 3+} charge transfer bands at about 220 nm have been observed. ► The 4f–5d spin-allowed and spin-forbidden transitions of Tb{sup 3+} have been observed. ► There is energy transfer between the host and rare-earth activators. -- Abstract: Rare earth (RE = Sm, Eu, Tb, Dy and Tm)-activated K{sub 2}LnZr(PO{sub 4}){sub 3} (Ln = Y, La, Gd and Lu) have been synthesized by solid-state reaction method, and their vacuum ultraviolet (VUV) excitation luminescent characteristics have been investigated.more » The band in the wavelength range of 130–157 nm and the other one range from 155 to 216 nm with the maximum at about 187 nm in the VUV excitation spectra of these compounds are attributed to the host lattice absorption and O–Zr charge transfer transition, respectively. The charge transfer bands (CTB) of O{sup 2−}-Sm{sup 3+}, O{sup 2−}-Dy{sup 3+} and O{sup 2−}-Tm{sup 3+}, in Sm{sup 3+}, Dy{sup 3+} and Tm{sup 3+}-activated samples, have not been obviously observed probably because the 2p electrons of oxygen are tightly bound to the zirconium ion in the host lattice. For Eu{sup 3+}-activated samples, the relatively weak O{sup 2−}-Eu{sup 3+} CTB at about 220 nm is observed. And for Tb{sup 3+}-activated samples, the bands at 223 and 258 nm are related to the 4f-5d spin-allowed and spin-forbidden transitions of Tb{sup 3+}, respectively. It is observed that there is energy transfer between the host lattice and the luminescent activators (e.g. Eu{sup 3+}, Tb{sup 3+}). From the standpoint of luminescent efficiency, color purity and chemical stability, K{sub 2}GdZr(PO{sub 4}){sub 3}:Sm{sup 3+}, Eu{sup 3+}, Tb{sup 3+} are attractive candidates for novel yellow, red, green-emitting PDP phosphors.« less
  • The orthorhombic crystal structures of the series of Ln{sub 4-x}In{sub 5-y}S{sub 13} (Ln=La, Ce, Pr and Nd; x=0.08-0.12, y=0.21-0.24) compounds were investigated by means of X-ray crystal diffraction. The crystals of La{sub 3}In{sub 1.67}S{sub 7} and Gd{sub 3}InS{sub 6} were also obtained unexpectedly from the La-In-S and Gd-In-S systems and no respective Gd{sub 4-x}In{sub 5-y}S{sub 13} was obtained. In the structures of the orthorhombic Ln{sub 4-x}In{sub 5-y}S{sub 13} series and hexagonal La{sub 3}In{sub 1.67}S{sub 7} indium atoms occupy disordered positions in the octahedral and trigonal antiprismatic arrangement of the sulphur atoms. The crystal structure of the La{sub 4}Ag{sub 2}In{sub 4}S{submore » 13} is also given and discussed as an example of quaternary sulphide related to a ternary La-In sulphide. - Graphical abstract: In the series of the Ln{sub 4-x}In{sub 5-y}S{sub 13} (Ln=La, Ce, Pr and Nd; x=0.08-0.12, y=0.21-0.24) compounds the indium atoms occupy disordered position in the octahedral arrangement of the sulphur atoms. The tetrahedral position is ordered.« less