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Effect of rare-earth substitution on the electrical properties and Raman spectroscopy of BCTZ ceramics.

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Title: Effect of rare-earth substitution on the electrical properties and Raman spectroscopy of BCTZ ceramics.
Authors: Hamza, A.1 abirhamza@yahoo.fr, Benabdallah, F.1, Kallel, I.1, Seveyrat, L.2, Lebrun, L.2, Khemakhem, H.1
Source: Journal of Alloys & Compounds. Feb2018, Vol. 735, p2523-2531. 9p.
Subjects: Rare earth metals, Solid state chemistry, X-ray powder diffraction, Raman scattering, Ferroelectric crystals
Abstract: A-site deficient rare-earth (Nd, Gd, and Y) doped (Ba 0.99 Ca 0.01 )(Zr 0.2 Ti 0.8 )O 3 ceramics (noted BCTZ) were obtained by the conventional solid-state reaction method. X-ray powder diffraction experiments combined with first-order Raman scattering analysis were performed to provide detailed description of the structures with different ferroelectric/non-ferroelectric phases. Raman spectra investigations give evidence of compositional disorder as well as a significant change of polar order with the incorporation of rare-earth ions on the A-site of BCTZ lattice. The dielectric and ferroelectric properties of the (Ba 1-x Ln 2x/3 ) 0.99 Ca 0.01 )(Zr 0.2 Ti 0.8 )O 3 ceramics (x = 0 and x = 0.015, Ln = Nd, Gd and Y) were thoroughly investigated as a function of frequency and temperature. This work highlights and demonstrates that the diffuseness of the phase transition increases and that the relaxor behavior is intensifies with rare-earth substitution. Moreover, the transition temperature is remarkably shifted to lower temperature for doped BCTZ ceramics. In the low temperature region, slim ferroelectric hysteresis loops with a low coercive field were observed for all compositions emphasizing their soft character. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 126870152
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Effect of rare-earth substitution on the electrical properties and Raman spectroscopy of BCTZ ceramics.
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  Data: <searchLink fieldCode="AR" term="%22Hamza%2C+A%2E%22">Hamza, A.</searchLink><relatesTo>1</relatesTo><i> abirhamza@yahoo.fr</i><br /><searchLink fieldCode="AR" term="%22Benabdallah%2C+F%2E%22">Benabdallah, F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kallel%2C+I%2E%22">Kallel, I.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Seveyrat%2C+L%2E%22">Seveyrat, L.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lebrun%2C+L%2E%22">Lebrun, L.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Khemakhem%2C+H%2E%22">Khemakhem, H.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Alloys+%26+Compounds%22">Journal of Alloys & Compounds</searchLink>. Feb2018, Vol. 735, p2523-2531. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Rare+earth+metals%22">Rare earth metals</searchLink><br /><searchLink fieldCode="DE" term="%22Solid+state+chemistry%22">Solid state chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+powder+diffraction%22">X-ray powder diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Raman+scattering%22">Raman scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Ferroelectric+crystals%22">Ferroelectric crystals</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A-site deficient rare-earth (Nd, Gd, and Y) doped (Ba 0.99 Ca 0.01 )(Zr 0.2 Ti 0.8 )O 3 ceramics (noted BCTZ) were obtained by the conventional solid-state reaction method. X-ray powder diffraction experiments combined with first-order Raman scattering analysis were performed to provide detailed description of the structures with different ferroelectric/non-ferroelectric phases. Raman spectra investigations give evidence of compositional disorder as well as a significant change of polar order with the incorporation of rare-earth ions on the A-site of BCTZ lattice. The dielectric and ferroelectric properties of the (Ba 1-x Ln 2x/3 ) 0.99 Ca 0.01 )(Zr 0.2 Ti 0.8 )O 3 ceramics (x = 0 and x = 0.015, Ln = Nd, Gd and Y) were thoroughly investigated as a function of frequency and temperature. This work highlights and demonstrates that the diffuseness of the phase transition increases and that the relaxor behavior is intensifies with rare-earth substitution. Moreover, the transition temperature is remarkably shifted to lower temperature for doped BCTZ ceramics. In the low temperature region, slim ferroelectric hysteresis loops with a low coercive field were observed for all compositions emphasizing their soft character. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.jallcom.2017.11.351
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 2523
    Subjects:
      – SubjectFull: Rare earth metals
        Type: general
      – SubjectFull: Solid state chemistry
        Type: general
      – SubjectFull: X-ray powder diffraction
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      – SubjectFull: Raman scattering
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      – SubjectFull: Ferroelectric crystals
        Type: general
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      – TitleFull: Effect of rare-earth substitution on the electrical properties and Raman spectroscopy of BCTZ ceramics.
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              Text: Feb2018
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              Y: 2018
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