Raman spectra and extended X-ray absorption fine structure characterization of La(2-x)/3NaxTiO3 and Nd(2-x)/3LixTiO3 microwave ceramics

Mei Yu Chen; Ching Yu Chiu; Chia Ta Chia; J. F. Lee; J. J. Bian

doi:10.1016/j.jeurceramsoc.2009.07.024

Raman spectra and extended X-ray absorption fine structure characterization of La_(2-x)/3Na_xTiO₃ and Nd_(2-x)/3Li_xTiO₃ microwave ceramics

Mei Yu Chen, Ching Yu Chiu, Chia Ta Chia^*, J. F. Lee, J. J. Bian

^*Corresponding author for this work

Department of Physics

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

10 Citations (Scopus)

Abstract

A-site deficient perovskite compounds, La_(2-x)/3Na_xTiO₃ (0.02 ≤ x ≤ 0.5) and Nd_(2-x)/3Li_xTiO₃ (0.1 ≤ x ≤ 0.5) microwave ceramics, were investigated by Raman scattering. Nd_(2-x)/3Li_xTiO₃ (0.1 ≤ x ≤ 0.5) was also investigated by extended X-ray absorption fine structure (EXAFS) measurement. The Raman shifts of the E (239 cm^-1) and A₁ (322 cm^-1) modes of La_(2-x)/3Na_xTiO₃ were found to decrease with x. However, the E (254 cm^-1) and A₁ (338 cm^-1) of Nd_(2-x)/3Li_xTiO₃ were found to blueshift with x, which was caused by Li substitution. The redshift of the A₁ (471 cm^-1) phonon of Nd_(2-x)/3Li_xTiO₃ (0.1 ≤ x ≤ 0.3) indicates that O-Ti-O bonding forces lessen with Li concentration, which is consistent with the EXAFS result that Ti-O bond lengths increase for 0.1 ≤ x ≤ 0.3. For x > 0.3, the EXAFS result shows that Ti-O bond lengths decrease. Moreover, Ti-O bond lengths show strong correlation with the microwave dielectric constants of Nd_(2-x)/3Li_xTiO₃.

Original language	English
Pages (from-to)	335-339
Number of pages	5
Journal	Journal of the European Ceramic Society
Volume	30
Issue number	2
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2009.07.024
Publication status	Published - 2010 Jan

Keywords

Dielectric properties
Optical properties
Spectroscopy
X-ray methods

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2009.07.024

Cite this

@article{865b382fe25d4bd8bba3dbff50aca46e,

title = "Raman spectra and extended X-ray absorption fine structure characterization of La(2-x)/3NaxTiO3 and Nd(2-x)/3LixTiO3 microwave ceramics",

abstract = "A-site deficient perovskite compounds, La(2-x)/3NaxTiO3 (0.02 ≤ x ≤ 0.5) and Nd(2-x)/3LixTiO3 (0.1 ≤ x ≤ 0.5) microwave ceramics, were investigated by Raman scattering. Nd(2-x)/3LixTiO3 (0.1 ≤ x ≤ 0.5) was also investigated by extended X-ray absorption fine structure (EXAFS) measurement. The Raman shifts of the E (239 cm-1) and A1 (322 cm-1) modes of La(2-x)/3NaxTiO3 were found to decrease with x. However, the E (254 cm-1) and A1 (338 cm-1) of Nd(2-x)/3LixTiO3 were found to blueshift with x, which was caused by Li substitution. The redshift of the A1 (471 cm-1) phonon of Nd(2-x)/3LixTiO3 (0.1 ≤ x ≤ 0.3) indicates that O-Ti-O bonding forces lessen with Li concentration, which is consistent with the EXAFS result that Ti-O bond lengths increase for 0.1 ≤ x ≤ 0.3. For x > 0.3, the EXAFS result shows that Ti-O bond lengths decrease. Moreover, Ti-O bond lengths show strong correlation with the microwave dielectric constants of Nd(2-x)/3LixTiO3.",

keywords = "Dielectric properties, Optical properties, Spectroscopy, X-ray methods",

author = "Chen, {Mei Yu} and Chiu, {Ching Yu} and Chia, {Chia Ta} and Lee, {J. F.} and Bian, {J. J.}",

note = "Funding Information: The authors would like to thank the National Science Council of the Republic of China for financially supporting this research under Contract Nos. NSC 96-2112-M-003-009-MY3 and NSC 97-2627-M-003-003. ",

year = "2010",

month = jan,

doi = "10.1016/j.jeurceramsoc.2009.07.024",

language = "English",

volume = "30",

pages = "335--339",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier BV",

number = "2",

}

TY - JOUR

T1 - Raman spectra and extended X-ray absorption fine structure characterization of La(2-x)/3NaxTiO3 and Nd(2-x)/3LixTiO3 microwave ceramics

AU - Chen, Mei Yu

AU - Chiu, Ching Yu

AU - Chia, Chia Ta

AU - Lee, J. F.

AU - Bian, J. J.

N1 - Funding Information: The authors would like to thank the National Science Council of the Republic of China for financially supporting this research under Contract Nos. NSC 96-2112-M-003-009-MY3 and NSC 97-2627-M-003-003.

PY - 2010/1

Y1 - 2010/1

N2 - A-site deficient perovskite compounds, La(2-x)/3NaxTiO3 (0.02 ≤ x ≤ 0.5) and Nd(2-x)/3LixTiO3 (0.1 ≤ x ≤ 0.5) microwave ceramics, were investigated by Raman scattering. Nd(2-x)/3LixTiO3 (0.1 ≤ x ≤ 0.5) was also investigated by extended X-ray absorption fine structure (EXAFS) measurement. The Raman shifts of the E (239 cm-1) and A1 (322 cm-1) modes of La(2-x)/3NaxTiO3 were found to decrease with x. However, the E (254 cm-1) and A1 (338 cm-1) of Nd(2-x)/3LixTiO3 were found to blueshift with x, which was caused by Li substitution. The redshift of the A1 (471 cm-1) phonon of Nd(2-x)/3LixTiO3 (0.1 ≤ x ≤ 0.3) indicates that O-Ti-O bonding forces lessen with Li concentration, which is consistent with the EXAFS result that Ti-O bond lengths increase for 0.1 ≤ x ≤ 0.3. For x > 0.3, the EXAFS result shows that Ti-O bond lengths decrease. Moreover, Ti-O bond lengths show strong correlation with the microwave dielectric constants of Nd(2-x)/3LixTiO3.

AB - A-site deficient perovskite compounds, La(2-x)/3NaxTiO3 (0.02 ≤ x ≤ 0.5) and Nd(2-x)/3LixTiO3 (0.1 ≤ x ≤ 0.5) microwave ceramics, were investigated by Raman scattering. Nd(2-x)/3LixTiO3 (0.1 ≤ x ≤ 0.5) was also investigated by extended X-ray absorption fine structure (EXAFS) measurement. The Raman shifts of the E (239 cm-1) and A1 (322 cm-1) modes of La(2-x)/3NaxTiO3 were found to decrease with x. However, the E (254 cm-1) and A1 (338 cm-1) of Nd(2-x)/3LixTiO3 were found to blueshift with x, which was caused by Li substitution. The redshift of the A1 (471 cm-1) phonon of Nd(2-x)/3LixTiO3 (0.1 ≤ x ≤ 0.3) indicates that O-Ti-O bonding forces lessen with Li concentration, which is consistent with the EXAFS result that Ti-O bond lengths increase for 0.1 ≤ x ≤ 0.3. For x > 0.3, the EXAFS result shows that Ti-O bond lengths decrease. Moreover, Ti-O bond lengths show strong correlation with the microwave dielectric constants of Nd(2-x)/3LixTiO3.

KW - Dielectric properties

KW - Optical properties

KW - Spectroscopy

KW - X-ray methods

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DO - 10.1016/j.jeurceramsoc.2009.07.024

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SN - 0955-2219

VL - 30

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EP - 339

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

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