The barium titano-disilicate BaTiSi2O7: a structural investigation by vibrational spectroscopy and X-ray powder diffraction

Stassen, S.; Tarte, P.; Rulmont, A.

doi:10.1016/s1386-1425(98)00042-0

Cited by 13 publications

(17 citation statements)

References 12 publications

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“…These latter peaks are attributed to the Q 2 and Q 3 Si based tetrahedral units (where n in Q n is the number of bridging oxygens per SiO4 tetrahedron) respectively [20]. The presently studied glasses have their composition relatively close to the one of the fresnoite crystalline phase (Ba2TiSi2O8) and there are A c c e p t e d m a n u s c r i p t thus clear similarities between our Raman spectra and those reported by the former authors [21][22][23]. The bands between 280 cm -1 and 360 cm -1 can be interpreted as the translations and bending modes of TiO5 and Si2O7 groups [24].…”

Section: Structure and Physical Propertiessupporting

confidence: 84%

“…Indeed, these bands are not observed in barium glasses [23].The Raman spectra of fresnoite-like glasses show a very intense peak at around 860 cm -1 , corresponding to the stretching mode of Ti-O within TiO5 groups, and indicating a very short distance of Ti-O bonds [25]. In this configuration, the apical oxygen is strongly bonded to titanium (forming what can be considered as a double Ti=O bond), and is practically not bonded to the other cations of the structure [22]. This large band is also assimilated to the stretching vibration of Ti-O* (where O* stands for NBO) bonds [21].…”

Section: Structure and Physical Propertiesmentioning

confidence: 99%

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Elasticity and viscosity of BaO TiO2SiO2 glasses in the 0.9 to 1.2Tg temperature interval

Mezeix¹,

Célarié²,

Houizot³

et al. 2016

Journal of Non-Crystalline Solids

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In spite of the potential applications of glasses in the BaO-TiO2-SiO2 (BTS) system, the mechanical properties of these glasses were little studied so far. Several centimeters large batches of glasses along the 0.3BaO-xTiO2-(0.7-x)SiO2 composition line were prepared. Their creep behavior and elastic moduli were investigated as a function of x (from x = 0 to x = 0.3). Titanium increases the atomic packing density as well as the volume density of energy and so do the elastic moduli. An excellent agreement is found between the elastic softening index () and the liquid fragility (m) (according to Angell's concept [1]). Nevertheless, as TiO2 is added the glass-forming liquid becomes more "fragile". The explanation might lie in the structural similarity between the fresnoite crystal and the glass structure consisting of island-like Si-Ti rich units surrounded by barium-rich channels. These islands would contribute to the increase in rigidity whereas the Ba-rich channels, acting as a lubricant, would make the viscous flow more temperature sensitive.

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Section: Structure and Physical Propertiessupporting

confidence: 84%

Section: Structure and Physical Propertiesmentioning

confidence: 99%

Elasticity and viscosity of BaO TiO2SiO2 glasses in the 0.9 to 1.2Tg temperature interval

Mezeix¹,

Célarié²,

Houizot³

et al. 2016

Journal of Non-Crystalline Solids

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“…On the other hand, the sintered BTS3 sample still kept the ceramic body without any molten spots at 1230°C. By the comparison to the XRD data reported by Stassen et al, 13) the sintered matter with the BTS2 composition was identified to BaTiSi2O7 phase, indicating single formation of the suzukiite-type BaTiSi2O7. Considerable increase of intensity of the diffraction peaks corresponding to the BaTiSi2O7 phase was observed in the sintered BTS3 sample compared to that of BTS2 sample.…”

Section: Characterizationmentioning

confidence: 65%

Origin of photoluminescence in suzukiite-type BaTiSi2O7

Takahashi

Konishi

Soga

et al. 2008

J. Ceram. Soc. Japan

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A barium titanosilicate, BaTiSi2O7, with suzukiite (BaVSi2O7)-type structure has a unique Ti-O unit, which consists of mirrorsymmetrical TiO5 pyramids pair, and possesses a visible orange photoluminescence (PL) by an ultraviolet excitation at room temperature. However, the origin of orange PL has not been fully understood. Therefore, the purpose of this study is to elucidate the origin and mechanism of orange PL in suzukiite-type BaTiSi2O7. It has been proposed that two types of oxygen-defect in the pyramidal TiO5 unit pair contribute to the efficient orange PL, i.e., the extrinsic oxygen-vacancy due to the lack of oxygen in the TiO5 unit, and the intrinsic oxygen-vacancy, which exists in the TiO5 unit pair due to its structural peculiarity.

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“…Among them, it is interesting to note the formation of bipyramidal structures, similar to the defect configuration proposed by Stassen et al for titanosilicates. 44 It is remarkable that this kind of structure, as well as many other tested configurations for the interstitial Ti defects, results in short Ti-O bonds ($1.7 Å ). So we must further consider the possibility that these bonds can contribute to the high wavenumber vibrational modes observed in RE doped BCT.…”

mentioning

confidence: 89%

Structural and optical properties of rare earth–doped (Ba0.77Ca0.23)1−x(Sm, Nd, Pr, Yb)xTiO3

Moraes

Filho

Freire

et al. 2011

Journal of Applied Physics

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Enhanced dielectric and piezoelectric properties of xBaZrO3-(1−x)BaTiO3 ceramics J. Appl. Phys. 111, 084107 (2012) Combined experimental and theoretical study of the low temperature dielectric and magnetic properties of trivalent Eu ion doped SrTiO3 ceramics J. Appl. Phys. 111, 063529 (2012) The long range voice coil atomic force microscope Rev. Sci. Instrum. 83, 023705 (2012) Large area ceramic thin films on plastics: A versatile route via solution processing J. Appl. Phys. 111, 016106 (2012) Oxygen deficiency and grain boundary-related giant relaxation in Ba(Zr,Ti)O3 ceramics J. Appl. Phys. 110, 114110 (2011) Additional information on J. Appl. Phys. The pure and RE-doped BCT23 ceramics sintered at 1450 C in air for 4 h showed a dense microstructure in all ceramics. The use of RE ions as dopants introduced lattice-parameter changes that manifested in the reduction of the volume of the unit cell. RE-doped BCT23 samples exhibit a more homogenous microstructure due to the absence of a Ti-rich phase in the grain boundaries as demonstrated by scanning electron microscopy imaging. The incorporation of REs led to perturbations of the local symmetry of TiO 6 octahedra and the creation of a new Raman mode. The results of Raman scattering measurements indicated that the Curie temperature of the ferroelectric phase transition depends on the RE ion and ion content, with the Curie temperature shifting toward lower values as the RE content increases, with the exception of Yb 3þ doping, which did not affect the ferroelectric phase transition temperature. The phase transition behavior is explained using the standard soft mode model. Electronic paramagnetic resonance measurements showed the existence of Ti vacancies in the structure of RE-doped BCT23. Defects are created via charge compensation mechanisms due to the incorporation of elements with a different valence state relative to the ions of the pure BCT23 host. It is concluded that the Ti vacancies are responsible for the activation of the Raman mode at 840 cm À1 , which is in agreement with lattice dynamics calculations.

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The barium titano-disilicate BaTiSi2O7: a structural investigation by vibrational spectroscopy and X-ray powder diffraction

Cited by 13 publications

References 12 publications

Elasticity and viscosity of BaO TiO2SiO2 glasses in the 0.9 to 1.2Tg temperature interval

Elasticity and viscosity of BaO TiO2SiO2 glasses in the 0.9 to 1.2Tg temperature interval

Origin of photoluminescence in suzukiite-type BaTiSi2O7

Structural and optical properties of rare earth–doped (Ba0.77Ca0.23)1−x(Sm, Nd, Pr, Yb)xTiO3

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