Journal
MATERIALS RESEARCH BULLETIN
Volume 45, Issue 11, Pages 1654-1658Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2010.07.007
Keywords
Ceramics; Infrared spectroscopy; Optical properties
Categories
Funding
- Natural Science Foundation of China [60906046]
- Major State Basic Research Development Program of China [2007CB924901]
- Program of New Century Excellent Talents, MOE [NCET-08-0192]
- Shanghai Municipal Commission of Science and Technology [10DJ1400201, 08JC1409000, 08520706100, 09ZZ42]
- Fundamental Research Funds for the Central Universities
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Infrared optical properties of SrBi2-xNdxNb2O9 (SBNN) ceramics with different Nd compositions (from 0 to 0.2) have been investigated by near-normal incident reflectance technique. The experimental spectra in the wavenumbers range of 350-1500 cm-(1) were analyzed using the Lorentz oscillator model for five infrared-active phonon mode observed. It is found that the frequencies of the NbO6 tilting and symmetric stretching modes linearly decrease with the Nd composition due to the octahedra distortion. The high-frequency dielectric constant varies in the range from 4.55 +/- 0.04 to 4.80 +/- 0.04. Owing to the contribution from the stronger electronic transitions, the real part of dielectric function Re(epsilon) is estimated to about 4.0 in the high-frequency transparent region. (C) 2010 Elsevier Ltd. All rights reserved.
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