Broadband Brillouin scattering study of ferroelectric instability of barium sodium niobate

Bibliographic Details
Title: Broadband Brillouin scattering study of ferroelectric instability of barium sodium niobate
Authors: S. Kojima
Source: Condensed Matter Physics, Vol 25, Iss 4, p 43702 (2022)
Publisher Information: Institute for Condensed Matter Physics, 2022.
Publication Year: 2022
Collection: LCC:Physics
Subject Terms: brillouin scattering, ferroelectric, order-disorder, central peak, barium sodium niobate, Physics, QC1-999
More Details: The barium sodium niobate (BNN) with tungsten-bronze structure is one of well-known optical crystals for electro-optic and nonlinear optic applications. This paper reviews the ferroelectric instability of BNN crystals. BNN is a uniaxial ferroelectric with a spontaneous polarization along the tetragonal c-axis. There is no report on the observation of an optical soft mode responsible for a ferroelectric phase transition. In the vicinity of the Curie temperature, T_C = 560°C, an intense central peak (CP) related to the polarization fluctuations along the c-axis was observed by the broadband Brillouin scattering experiment. The relaxation time determined by the CP width shows the critical slowing down towards T_C. This fact indicates that the ferroelectric instability of BNN is an order-disorder type.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1607-324X
2224-9079
Relation: https://doaj.org/toc/1607-324X; https://doaj.org/toc/2224-9079
DOI: 10.5488/CMP.25.43702
Access URL: https://doaj.org/article/3a33fc401ca04ec2b94f20d44203edc7
Accession Number: edsdoj.3a33fc401ca04ec2b94f20d44203edc7
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  Data: Broadband Brillouin scattering study of ferroelectric instability of barium sodium niobate
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  Data: <searchLink fieldCode="AR" term="%22S%2E+Kojima%22">S. Kojima</searchLink>
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  Data: Condensed Matter Physics, Vol 25, Iss 4, p 43702 (2022)
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  Data: Institute for Condensed Matter Physics, 2022.
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  Data: <searchLink fieldCode="DE" term="%22brillouin+scattering%22">brillouin scattering</searchLink><br /><searchLink fieldCode="DE" term="%22ferroelectric%22">ferroelectric</searchLink><br /><searchLink fieldCode="DE" term="%22order-disorder%22">order-disorder</searchLink><br /><searchLink fieldCode="DE" term="%22central+peak%22">central peak</searchLink><br /><searchLink fieldCode="DE" term="%22barium+sodium+niobate%22">barium sodium niobate</searchLink><br /><searchLink fieldCode="DE" term="%22Physics%22">Physics</searchLink><br /><searchLink fieldCode="DE" term="%22QC1-999%22">QC1-999</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: The barium sodium niobate (BNN) with tungsten-bronze structure is one of well-known optical crystals for electro-optic and nonlinear optic applications. This paper reviews the ferroelectric instability of BNN crystals. BNN is a uniaxial ferroelectric with a spontaneous polarization along the tetragonal c-axis. There is no report on the observation of an optical soft mode responsible for a ferroelectric phase transition. In the vicinity of the Curie temperature, T_C = 560°C, an intense central peak (CP) related to the polarization fluctuations along the c-axis was observed by the broadband Brillouin scattering experiment. The relaxation time determined by the CP width shows the critical slowing down towards T_C. This fact indicates that the ferroelectric instability of BNN is an order-disorder type.
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  Data: 1607-324X<br />2224-9079
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        StartPage: 43702
    Subjects:
      – SubjectFull: brillouin scattering
        Type: general
      – SubjectFull: ferroelectric
        Type: general
      – SubjectFull: order-disorder
        Type: general
      – SubjectFull: central peak
        Type: general
      – SubjectFull: barium sodium niobate
        Type: general
      – SubjectFull: Physics
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      – SubjectFull: QC1-999
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      – TitleFull: Broadband Brillouin scattering study of ferroelectric instability of barium sodium niobate
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