Analysis of disordered nonstoichiometric Ln1-xAe xF3-x (Ln = Tb or Gd, and Ae = Ca or Sr) single crystals

Valentyn Vasyliev; Yuichi Michiue; Encarnación G. Víllora; Yoshitaka Matsushita; Akira Sato; Masahiro Nagao; Yoshiyuki Sugahara; Kiyoshi Shimamura

doi:10.1524/zkri.2013.1666

Analysis of disordered nonstoichiometric Ln_1-xAe _xF_3-x (Ln = Tb or Gd, and Ae = Ca or Sr) single crystals

Valentyn Vasyliev^*, Yuichi Michiue, Encarnación G. Víllora, Yoshitaka Matsushita, Akira Sato, Masahiro Nagao, Yoshiyuki Sugahara, Kiyoshi Shimamura

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

High quality nonstochiometric Tb- and Gdbased single crystals Tb _0.81Ca_0.19F_2.81 (TCF), Tb_0.76Sr _0.24F_2.76 (TSF), Gd_0.85Ca_0.15F _2.85 (GCF), Gd_0.83Sr_0.17F_2.83 (GSF) are analyzed in crystallographic detail by single-crystal X-ray diffraction measurements. TSF shows only main reflections, and its structure is refined to a disordered P6₃/mmc structural model. Additional satellite reflections observed in GSF lead to an ordered twinned P3̄c1 structural model. The other two crystals TCF and GCF cannot be assigned uniquely to any of these space groups. Instead, their structures are interpreted as the coexistence of both space groups in separate domains.

Original language	English
Pages (from-to)	576-582
Number of pages	7
Journal	Zeitschrift fur Kristallographie
Volume	288
Issue number	11
DOIs	https://doi.org/10.1524/zkri.2013.1666
Publication status	Published - 2013 Nov

Keywords

Disordered structure
Nonstoichiometric compound
Rare-earth fluoride
Single crystal
Tysonite

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Inorganic Chemistry

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10.1524/zkri.2013.1666

Cite this

@article{cc30680e3e4c490bb45e8e00158aeed0,

title = "Analysis of disordered nonstoichiometric Ln1-xAe xF3-x (Ln = Tb or Gd, and Ae = Ca or Sr) single crystals",

abstract = "High quality nonstochiometric Tb- and Gdbased single crystals Tb 0.81Ca0.19F2.81 (TCF), Tb0.76Sr 0.24F2.76 (TSF), Gd0.85Ca0.15F 2.85 (GCF), Gd0.83Sr0.17F2.83 (GSF) are analyzed in crystallographic detail by single-crystal X-ray diffraction measurements. TSF shows only main reflections, and its structure is refined to a disordered P63/mmc structural model. Additional satellite reflections observed in GSF lead to an ordered twinned P{\=3}c1 structural model. The other two crystals TCF and GCF cannot be assigned uniquely to any of these space groups. Instead, their structures are interpreted as the coexistence of both space groups in separate domains.",

keywords = "Disordered structure, Nonstoichiometric compound, Rare-earth fluoride, Single crystal, Tysonite",

author = "Valentyn Vasyliev and Yuichi Michiue and V{\'i}llora, {Encarnaci{\'o}n G.} and Yoshitaka Matsushita and Akira Sato and Masahiro Nagao and Yoshiyuki Sugahara and Kiyoshi Shimamura",

note = "Funding Information: Acknowledgements. This work has been partially supported by the Ministry of Education, Science, Sport and Culture, Grant-in-Aid for Scientific Research {\textcopyright}, 22560316, 2010.",

year = "2013",

month = nov,

doi = "10.1524/zkri.2013.1666",

language = "English",

volume = "288",

pages = "576--582",

journal = "Zeitschfrift fur Kristallographie",

issn = "0044-2968",

publisher = "R. Oldenbourg",

number = "11",

}

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T1 - Analysis of disordered nonstoichiometric Ln1-xAe xF3-x (Ln = Tb or Gd, and Ae = Ca or Sr) single crystals

AU - Vasyliev, Valentyn

AU - Michiue, Yuichi

AU - Víllora, Encarnación G.

AU - Matsushita, Yoshitaka

AU - Sato, Akira

AU - Nagao, Masahiro

AU - Sugahara, Yoshiyuki

AU - Shimamura, Kiyoshi

N1 - Funding Information: Acknowledgements. This work has been partially supported by the Ministry of Education, Science, Sport and Culture, Grant-in-Aid for Scientific Research ©, 22560316, 2010.

PY - 2013/11

Y1 - 2013/11

N2 - High quality nonstochiometric Tb- and Gdbased single crystals Tb 0.81Ca0.19F2.81 (TCF), Tb0.76Sr 0.24F2.76 (TSF), Gd0.85Ca0.15F 2.85 (GCF), Gd0.83Sr0.17F2.83 (GSF) are analyzed in crystallographic detail by single-crystal X-ray diffraction measurements. TSF shows only main reflections, and its structure is refined to a disordered P63/mmc structural model. Additional satellite reflections observed in GSF lead to an ordered twinned P3̄c1 structural model. The other two crystals TCF and GCF cannot be assigned uniquely to any of these space groups. Instead, their structures are interpreted as the coexistence of both space groups in separate domains.

AB - High quality nonstochiometric Tb- and Gdbased single crystals Tb 0.81Ca0.19F2.81 (TCF), Tb0.76Sr 0.24F2.76 (TSF), Gd0.85Ca0.15F 2.85 (GCF), Gd0.83Sr0.17F2.83 (GSF) are analyzed in crystallographic detail by single-crystal X-ray diffraction measurements. TSF shows only main reflections, and its structure is refined to a disordered P63/mmc structural model. Additional satellite reflections observed in GSF lead to an ordered twinned P3̄c1 structural model. The other two crystals TCF and GCF cannot be assigned uniquely to any of these space groups. Instead, their structures are interpreted as the coexistence of both space groups in separate domains.

KW - Disordered structure

KW - Nonstoichiometric compound

KW - Rare-earth fluoride

KW - Single crystal

KW - Tysonite

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