Raman scattering study of RETiTaO6 dielectric ceramics

Paschoal, C. W. A.; Moreira, R. L.; Fantini, C.; Pimenta, M. A.; Surendran, Kuzhichalil Peethambharan; Sebastian, Mailadil Thomas

doi:10.1016/s0955-2219(03)00141-9

Cited by 32 publications

(32 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They have clearly differentiated aeschynite and euxenite structures based on the characteristic Raman bands. On comparing the measurements made in the present study with that already reported [13] it is found that the spectrum of 80PTT is exactly similar to that of PrTiTaO 6 which has aeschynite structure and the spectrum of 40PTT is almost similar to YTiTaO 6 which has euxenite structure. The spectra of 60PTT and 50PTT show both the phases in them.…”

Section: Resultssupporting

confidence: 82%

“…respectively and at 854 and 855 cm −1 in the case of 50PTT and 40PTT, respectively in accordance with the earlier reports [13,14]. This confirms the prominence of aeschynite structure in 80PTT and 60PTT and the prominence of euxenite structure in the other two.…”

supporting

confidence: 92%

“…The prominent peaks and their assignments are given in Table 2. Paschoal et al [13] have reported the Raman scattering study of the microwave dielectric system RETiTaO 6 for 15 different rare earths. They have clearly differentiated aeschynite and euxenite structures based on the characteristic Raman bands.…”

Section: Resultsmentioning

confidence: 99%

“…All the peaks below 200 cm −1 can be associated with the lattice modes. The isolated modes below 90 cm −1 can be associated with the octahedral displacements [13].…”

mentioning

confidence: 99%

See 3 more Smart Citations

Fabrication and characterization of xPrTiTaO6(1−x)YTiNbO6 microwave ceramic composites

Solomon¹,

Dhwajam²,

Remya³

et al. 2010

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 82%

supporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

“…All the peaks below 200 cm −1 can be associated with the lattice modes. The isolated modes below 90 cm −1 can be associated with the octahedral displacements [13].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Fabrication and characterization of xPrTiTaO6(1−x)YTiNbO6 microwave ceramic composites

Solomon¹,

Dhwajam²,

Remya³

et al. 2010

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…While the alkaline earth titanates, MgTiO 3 , CaTiO 3 , SrTiO 3 and BaTiO 3 possess very high dielectric constant values with a sharp peak at their ferroelectric Curie temperatures (Yanagida et al 1996;Rama Mohan et al 1998), the RE titanates are found to have low dielectric constant values, which remain almost constant at different temperatures. This peculiar property makes the RE titanates and their doped compositions to be attractive candidates for microwave applications as resonators etc (Jung et al 1996;Sebastian et al 2001;Paschoal et al 2003).…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Synthesis and characterization of monoclinic rare earth titanates, RE2Ti2O7 (RE = La, Pr, Nd), by a modified SHS method using inorganic activator

Krishnankutty

Dayas

2008

Bull Mater Sci

View full text Add to dashboard Cite

The nano particles of phase pure rare earth titanates, synthesized by the SHS technique, get well sintered at lower temperatures compared to the compounds formed by the solid-state method. These dielectrics are highly stable and can be used in the microwave frequency range. We report here a modified SHS method to synthesize phase pure monoclinic RE 2 Ti 2 O 7 at 350°C through the oxide/nitrate precursors using an inorganic compound, ammonium acetate, in place of the general type of organic activators such as urea, alanine etc. The nanopowders of La 2 Ti 2 O 7 , Pr 2 Ti 2 O 7 and Nd 2 Ti 2 O 7 on heating exhibit an exothermic behaviour with a broad maxima in the range 267-284°C and become endothermic with maxima in the range 1043-1220°C; interestingly, the phase pure crystalline material is formed at the temperature of exothermic maxima, as confirmed by XRD.

show abstract

Photoluminescence properties of aeschynite‐type LaNbTiO₆:RE³⁺ (RE = Tb, Dy, Ho) down‐converting phosphors

Lü

Yang

et al. 2013

Luminescence

View full text Add to dashboard Cite

In this study, a series of LaNbTiO6:RE(3+) (RE = Tb, Dy, Ho) down-converting phosphors were synthesized using a modified sol-gel combustion method, and their photoluminescence (PL) properties were investigated as a function of activator concentration and annealing temperature. The resultant particles were characterized using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, UV/Vis diffuse reflectance spectroscopy and PL spectra. The highly crystalline LaNbTiO6:RE(3+) (RE = Tb, Dy, Ho) phosphors with an average size of 200-300 nm obtained at 1100°C have an orthorhombic aeschynite-type structure and exhibit the highest luminescent intensity in our study range. The emission spectra of LaNbTiO6:RE(3+) (RE = Tb, Dy, Ho) phosphors under excitations at UV/blue sources are mainly composed of characteristic peaks arising from the f-f transitions of RE(3+), including 489 nm ((5) D4 → (7) F6) and 545 nm ((5) D4 → (7) F5) for Tb(3+), 476 and 482 nm ((4) F9/2 → (6) H15/2) and 571 nm ((4) F9/2 → (6) H13/2) for Dy(3+), and 545 nm ((5) F4 + (5) S2 → (5) I8) for Ho(3+), respectively. The luminescent mechanisms were further investigated. It can be expected that these phosphors are of intense interest and potential importance for many optical applications.

show abstract

Raman scattering study of RETiTaO6 dielectric ceramics

Cited by 32 publications

References 14 publications

Fabrication and characterization of xPrTiTaO6(1−x)YTiNbO6 microwave ceramic composites

Fabrication and characterization of xPrTiTaO6(1−x)YTiNbO6 microwave ceramic composites

Synthesis and characterization of monoclinic rare earth titanates, RE2Ti2O7 (RE = La, Pr, Nd), by a modified SHS method using inorganic activator

Photoluminescence properties of aeschynite‐type LaNbTiO₆:RE³⁺ (RE = Tb, Dy, Ho) down‐converting phosphors

Contact Info

Product

Resources

About

Raman scattering study of RETiTaO6 dielectric ceramics

Cited by 32 publications

References 14 publications

Fabrication and characterization of xPrTiTaO6(1−x)YTiNbO6 microwave ceramic composites

Fabrication and characterization of xPrTiTaO6(1−x)YTiNbO6 microwave ceramic composites

Synthesis and characterization of monoclinic rare earth titanates, RE2Ti2O7 (RE = La, Pr, Nd), by a modified SHS method using inorganic activator

Photoluminescence properties of aeschynite‐type LaNbTiO6:RE3+ (RE = Tb, Dy, Ho) down‐converting phosphors

Contact Info

Product

Resources

About

Photoluminescence properties of aeschynite‐type LaNbTiO₆:RE³⁺ (RE = Tb, Dy, Ho) down‐converting phosphors