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Browsing by Author "Dias, A"

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Chemical substitution in Ba(RE1/2Nb1/2)O-3 (RE = La, Nd, Sm, Gd, Tb, and Y) microwave ceramics and its influence on the crystal structure and phonon modes

Dias, A; Abdul Khalam, L; Sebastian, M T; Paschoal, C W A; Moreira, R L (American Chemical Society, 2006)

Raman spectroscopy was employed to evaluate the crystal structure and phonon modes of chemically substituted Ba(RE1/2Nb1/2)O-3 microwave ceramics (RE = La, Nd, Sm, Gd, Tb, and Y). It was verified that these materials could ...
Effect of nonstoichiometry on the structure and microwave dielectric properties of Ba(Mg0.33Ta0.67)O-3

Surendran, K P; Sebastian, M T; Mohanan, P; Moreira, R L; Dias, A (American Chemical Society, 2005)

The effect of a slight A- and B-site cation nonstoichiometry on the structure, densification, and microwave dielectric properties of Ba(Mg1/3Ta2/3)O-3 (BMT) was investigated. Magnesium and barium nonstoichiometric compositions ...
Optical phonon modes and dielectric behavior of Sr1-3x/2CexTiO3 microwave ceramics

Moreira, R L; Lobo, R P S M; Subodh, G; Sebastian, M T; Matinaga, F M; Dias, A (American Chemical Society, 2007)

Sr1-3x/2CexTiO3 dielectric ceramics (with x varying from 0.133 to 0.400) were investigated by Raman and infrared spectroscopies. The observed features could be related to SrTiO3 phonon modes. The Raman spectra show first-order ...
Raman and Infrared Spectroscopic Investigations of a Ferroelastic Phase Transition in Ba2ZnTeO6 Double Perovskite

Moreira, R L; Lobo, R P S M; Ramos, S L L M; Sebastian, T M; Matinaga, F M; Ariete Righi; Dias, A (American Physical Society, 2018-05-16)

The low-temperature vibrational properties of Ba2ZnTeO6 double-perovskite ceramics obtained by the solid-state route were investigated by Raman scattering and Fourier-transform infrared reflectivity. We found that this ...
Raman scattering and infrared spectroscopy of chemically substituted Sr(2)LnTaO(6) (Ln = Lanthanides, Y, and In) double perovskites

Dias, A; Abdul Khalam, L; Sebastian, M T; Lage, M M; Matinaga, F M; Moreira, R L (American Chemical Society, 2008)

Sr(2)LnTaO(6) (Ln = lanthanides, Y, and In) ceramics were prepared by a solid-state route, and their vibrational phonon modes were investigated using Raman and infrared (IR) spectroscopic techniques. Lorentzian lines were ...
Raman-spectroscopic investigation of Ba2InTaO6 and Sr2InTaO6 perovskites

Dias, A; Abdul Khalam, L; Sebastian, M T; Moreira, R L (Elsevier, 2007)

Raman spectroscopy was employed to investigate the structures and phonon modes of Ba2InTaO6 and Sr2InTaO6 ceramics. It was found that Ba-based samples belong to the tetragonal P4/mnc (#128 or D-4h(6)) space group, while ...
Raman-spectroscopic investigations on the crystal structure and phonon modes of Ba(RE1/2Ta1/2)O-3 microwave ceramics

Moreira, R L; Abdul Khalam, L; Sebastian, M T; Dias, A (Elsevier, 2007)

Complex Ba((RETa1/2)-Ta-1/2)O-3 [RE= rare earth] ceramics have been prepared by solid state ceramic route and their microwave dielectric responses were measured in the GHz range. In general, the resonators showed high ...
Structure and microwave dielectric properties of Sr2+nCe2Ti5+nO15+3n (n e 10) homologous series

Subodh, G; Jose James; Sebastian, M T; Paniago, R; Dias, A; Moreira, R L (American Chemical Society, 2007)

Nominally Sr2+nCe2Ti5+nO16+3n dielectric ceramics were prepared by conventional solid-state ceramic route. The structure and microstructural features of the ceramics were investigated by X-ray diffraction, X-ray photoelectron ...
Vibrational spectroscopy of Ca (2)LnTaO(6) (Ln = lanthanides, Y, and In) and Ca2InNbO6 double perovskites

Dias, A; Lage, M M; Abdul Khalam, L; Sebastian, M T; Moreira, R L (American Chemical Society, 2011)

Ca(2)LnTaO(6) (Ln = lanthanides, Y, and In) and Ca2InNbO6 ceramics were prepared by the solid-state route, and their vibrational properties were investigated using Raman scattering and infrared spectroscopy. The correct ...
Vibrational studies and microwave dielectric properties of a-site-substituted tellurium-based double perovskites

Dias, A; Subodh, G; Sebastian, M T; Lage, M M; Moreira, R L (American Chemical Society, 2008)

A(2)MgTeO(6) (A = Ba, Sr, Ca) ceramics were prepared by solid-state route and their microstructure and microwave dielectric properties, as well as the vibrational phonon modes were investigated using the resonance method ...

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