Vacancy-induced nanoscale phase separation in KxFe2–ySe₂ single crystals evidenced by Raman scattering and powder x-ray diffraction

Lazarević, N.; Abeykoon, M.; Stephens, P. W.; Lei, Hechang; Bozin, E. S.; Petrovic, C.; Popović, Z. V.

doi:10.1103/PhysRevB.86.054503

Title: Vacancy-induced nanoscale phase separation in K_xFe_2–ySe₂ single crystals evidenced by Raman scattering and powder x-ray diffraction

Abstract

Polarized Raman scattering spectra of K_xFe_2–ySe₂ were analyzed in terms of peculiarities of both I4/m and I4/mmm space group symmetries. The presence of the Raman active modes from both space group symmetries (16 Raman-active modes of the I4/m phase and two Raman-active modes of the I4/mmm phase) confirmed the existence of two crystallographic domains with different space group symmetry in a K_xFe_2–ySe₂ sample. High-resolution synchrotron powder x-ray diffraction structural refinement of the same sample confirmed the two-phase description, and determined the atomic positions and occupancies for both domains.

Authors:: Lazarević, N.; Abeykoon, M.; Stephens, P. W.; Lei, Hechang; Bozin, E. S.; Petrovic, C.; Popović, Z. V.

Publication Date:: Mon Aug 06 00:00:00 EDT 2012

Sponsoring Org.:: USDOE

OSTI Identifier:: 1103079

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 86 Journal Issue: 5; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Citation Formats


                    Lazarević, N., Abeykoon, M., Stephens, P. W., Lei, Hechang, Bozin, E. S., Petrovic, C., and Popović, Z. V. Vacancy-induced nanoscale phase separation in KxFe2–ySe₂ single crystals evidenced by Raman scattering and powder x-ray diffraction.  United States: N. p., 2012. 
Web.  doi:10.1103/PhysRevB.86.054503.

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                    Lazarević, N., Abeykoon, M., Stephens, P. W., Lei, Hechang, Bozin, E. S., Petrovic, C., & Popović, Z. V. Vacancy-induced nanoscale phase separation in KxFe2–ySe₂ single crystals evidenced by Raman scattering and powder x-ray diffraction.  United States.  https://doi.org/10.1103/PhysRevB.86.054503

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                    Lazarević, N., Abeykoon, M., Stephens, P. W., Lei, Hechang, Bozin, E. S., Petrovic, C., and Popović, Z. V. Mon .  
"Vacancy-induced nanoscale phase separation in KxFe2–ySe₂ single crystals evidenced by Raman scattering and powder x-ray diffraction".  United States.  https://doi.org/10.1103/PhysRevB.86.054503.

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@article{osti_1103079,

  title        = {Vacancy-induced nanoscale phase separation in KxFe2–ySe₂ single crystals evidenced by Raman scattering and powder x-ray diffraction},

  author       = {Lazarević, N. and Abeykoon, M. and Stephens, P. W. and Lei, Hechang and Bozin, E. S. and Petrovic, C. and Popović, Z. V.},

  abstractNote = {Polarized Raman scattering spectra of KxFe2–ySe₂ were analyzed in terms of peculiarities of both I4/m and I4/mmm space group symmetries. The presence of the Raman active modes from both space group symmetries (16 Raman-active modes of the I4/m phase and two Raman-active modes of the I4/mmm phase) confirmed the existence of two crystallographic domains with different space group symmetry in a KxFe2–ySe₂ sample. High-resolution synchrotron powder x-ray diffraction structural refinement of the same sample confirmed the two-phase description, and determined the atomic positions and occupancies for both domains.},

  doi          = {10.1103/PhysRevB.86.054503},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 5,

  volume       = 86,

  place        = {United States},

  year         = {Mon Aug 06 00:00:00 EDT 2012},

  month        = {Mon Aug 06 00:00:00 EDT 2012}

}

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Title: Vacancy-induced nanoscale phase separation in KxFe2–ySe₂ single crystals evidenced by Raman scattering and powder x-ray diffraction

Abstract

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Title: Vacancy-induced nanoscale phase separation in K_xFe_2–ySe₂ single crystals evidenced by Raman scattering and powder x-ray diffraction

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