Phase transformations in Na2O–K2O–Nb2O5–SiO2 glasses

Жилин, А. А.; Petrovsky, Gury Timofeevic; Golubkov, V. V.; Lipovskii, A. A.; Tagantsev, D. K.; Tatarintsev, B. V.; Shepilov, M. P.

doi:10.1016/j.jnoncrysol.2004.08.019

Cited by 19 publications

(7 citation statements)

References 3 publications

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“…Considering previous works of Petrovskii et al and Zhilin et al [11,12] which studied the phase separation and crystallization in glasses of the Na 2 O-K 2 O-Nb 2 O 5 -SiO 2 system using the conventional glass-ceramic method, the high temperature of about 700°C was used to precipitate a high-niobate phase which caused small angle light scattering. By using the incorporation method, a lower temperature of 525°C could be used to promote crystallization without any trace of a secondary phase.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of transparent lead-free KNN glass ceramics by incorporation method

et al. 2012

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The incorporation method was employed to produce potassium sodium niobate [KNN] (K0.5Na0.5NbO3) glass ceramics from the KNN-SiO2 system. This incorporation method combines a simple mixed-oxide technique for producing KNN powder and a conventional melt-quenching technique to form the resulting glass. KNN was calcined at 800°C and subsequently mixed with SiO2 in the KNN:SiO2 ratio of 75:25 (mol%). The successfully produced optically transparent glass was then subjected to a heat treatment schedule at temperatures ranging from 525°C -575°C for crystallization. All glass ceramics of more than 40% transmittance crystallized into KNN nanocrystals that were rectangular in shape and dispersed well throughout the glass matrix. The crystal size and crystallinity were found to increase with increasing heat treatment temperature, which in turn plays an important role in controlling the properties of the glass ceramics, including physical, optical, and dielectric properties. The transparency of the glass samples decreased with increasing crystal size. The maximum room temperature dielectric constant (εr) was as high as 474 at 10 kHz with an acceptable low loss (tanδ) around 0.02 at 10 kHz.

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Section: Resultsmentioning

confidence: 99%

Fabrication of transparent lead-free KNN glass ceramics by incorporation method

et al. 2012

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“…[11][12][13][14][15][16][17][18] Indeed, GC containing sodium niobate (NaNbO 3 ) nanocrystals (GC-SNN) proved to be an interesting material for all-optical switching and optical limiting applications. [15][16][17][18] The fabrication of GC-SNN is reported in Refs.…”

Section: Introductionmentioning

confidence: 99%

Luminescence properties and optical dephasing in a glass-ceramic containing sodium-niobate nanocrystals

Almeida

Menezes

Araújo

et al. 2011

Journal of Applied Physics

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Articles you may be interested inFine tunable red-green upconversion luminescence from glass ceramic containing 5%Er3+:NaYF4 nanocrystals under excitation of two near infrared femtosecond lasers J. Appl. Phys. 116, 063101 (2014); 10.1063/1.4892594Broadband optical amplification in silicate glass ceramics containing Li 2 Photoluminescence (PL) and degenerate four-wave-mixing (DFWM) experiments were performed in a silica-niobic composite containing NaNbO 3 nanocrystals. The PL results indicate the presence of in-gap states attributed to excitons in the nanocrystals and defect centers. The luminescence of the samples becomes more intense at low temperatures, indicating that nonradiative relaxations dominate the dynamics of the in-gap states. The DFWM experiments allowed for measurements of the homogeneous relaxation time, (20 6 3) fs, of the third-order polarization at room temperature. The main contributions to the dynamics of the electronic response are attributed to the trapping of electrons in the in-gap states and to carrier and phonon scattering.

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“…The samples' preparation procedure was detailed in [9,21]. The NCs presence has been verified by means of x-ray diffraction and transmission electron microscopy; the NCs filling fraction, f , depends on the heat-treatment time [9], but the NCs sizes do not depend, as determined by small angle x-ray scattering experiments [14,16]. The samples used in this work present NCs having sizes ranging from 5 to 25 nm with average size of 12 nm [13] and the other parameters are given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…In the past, the fabrication of GC-SNN posed challenges to materials scientists because it is hard to get homogeneous samples presenting large optical transparency. However, new fabrication routes were developed and good optical quality samples, with crystalline inclusions having average sizes of ≈10 nm, can be obtained [7][8][9][10][11][12][13][14]. This material has been considered for photonic applications, due to its suitability for electrical poling [15] and large nonlinear (NL) optical response [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet dynamical optical limiting in a glass containing NaNbO_3 nanocrystals

et al. 2013

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The nonlinear (NL) response of a glass-ceramic with sodium niobate (NaNbO 3 ) nanocrystals (NCs) was investigated exciting the samples at 385 nm, in resonance with the samples' optical absorption edge. Besides the observation of optical limiting (OL) behavior, we characterized the optical response of the samples in the 0.1-1.0 ms range that was attributed to the accumulated electronic population in trapping states associated with the NCs. The NL absorption properties of samples heat-treated during several hours were studied and modeled using a system of coupled rate equations to determine the parameters that characterize the OL process.

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Phase transformations in Na2O–K2O–Nb2O5–SiO2 glasses

Cited by 19 publications

References 3 publications

Fabrication of transparent lead-free KNN glass ceramics by incorporation method

Fabrication of transparent lead-free KNN glass ceramics by incorporation method

Luminescence properties and optical dephasing in a glass-ceramic containing sodium-niobate nanocrystals

Ultraviolet dynamical optical limiting in a glass containing NaNbO_3 nanocrystals

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