Crystal domain growth driven by nanometric phase separation in perfect surface crystallization

Takahashi, Yoshihiro; Yamaoka, Kazuki; Yamazaki, Yoshiki; Miyazaki, Takamichi; Fujiwara, Takeshi

doi:10.1063/1.4818674

Cited by 13 publications

(16 citation statements)

References 12 publications

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“…21. In contrast to the transparent glass ceramics previously achieved by annealing at lower temperatures for shorter time periods18192021, the resulting samples were rather opaque as shown in Figure 1a) and b). This is in agreement with the bluish white color observed after annealing at 880°C18.…”

Section: Resultsmentioning

confidence: 78%

“…So far EBSD is the only method with which oriented nucleation may be detected with certainty and EBSD has not been applied to the systems for which the growth model A is proposed to be valid. ii) High quality TEM results of glass A featuring a single crystal domain at the surface as well as the growth front only show uncrystallized glass, crystalline fresnoite and residual glass19. An area where two phase separated liquids coexist was not proved.…”

mentioning

confidence: 96%

“…The surface crystallization of STS, from glasses shows especially great potential due to a lack of bulk nucleation. This enables to prepare thick layers of oriented crystals181920212223.…”

mentioning

confidence: 99%

“…Recently two very different growth mechanisms have been formulated for the growth of STS in two different glass compositions: glass A of the composition STS+0.45 SiO 2 (Sr 2 TiSi 2.45 O 8.9 ) is being studied in Japan with a focus on preparing transparent glass-ceramics for optical applications18192021 while glass B of the composition STS+0.75 SiO 2 (Sr 2 TiSi 2.75 O 8.5 ) is being studied in Germany. This glass-ceramic was designed with a focus on the piezoelectric properties.…”

mentioning

confidence: 99%

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Microstructure of Transparent Strontium Fresnoite Glass-Ceramics

Wisniewski

Takano

Takahashi

et al. 2015

Sci Rep

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Glass-ceramics grown from a glass of the composition Sr2TiSi2.45O8.9 (STS 45) are analyzed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). Oriented nucleation with the c-axes preferably perpendicular to the surface is detected. A very strong 001-texture is observed after only 10 μm of growth into the bulk, making this the first system in which an orientation preferred during nucleation prevails during growth into the bulk in glass-ceramics. Piezoelectric measurements are performed and d33-values presented and discussed. The obtained results are critically viewed with respect to the two growth models describing Sr2TiSi2O8 growth in glasses.

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Section: Resultsmentioning

confidence: 78%

mentioning

confidence: 96%

“…The surface crystallization of STS, from glasses shows especially great potential due to a lack of bulk nucleation. This enables to prepare thick layers of oriented crystals181920212223.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Microstructure of Transparent Strontium Fresnoite Glass-Ceramics

Wisniewski

Takano

Takahashi

et al. 2015

Sci Rep

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“…1(d)]. In the previous studies2532, the nanometric parasites are due to the nanometric phase-separation into stoichiometric fresnoite-component and residual SiO 2 component, which finally transform to the crystal-domain and nanometric parasites, respectively. The assessment indicates that the sample obtained in this study is compatible with the PSC-GCs reported so far24‒26, and consequently it is considered that the obtained sample acquires the PSC features of i) to iii).…”

Section: Resultsmentioning

confidence: 97%

Pockels effect of silicate glass-ceramics: Observation of optical modulation in Mach–Zehnder system

Yamaoka

Takahashi

Yamazaki

et al. 2015

Sci Rep

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Silicate glass has been used for long time because of its advantages from material’s viewpoint. In this paper, we report the observation of Pockels effect by Mach–Zehnder interferometer in polycrystalline ceramics made from a ternary silicate glass via crystallization due to heat-treatment, i.e., glass-ceramics. Since the silicate system is employed as the precursor, merits of glass material are fully utilized to fabricate the optical device component, in addition to that of functional crystalline material, leading us to provide an electro-optic device, which is introducible into glass-fiber network.

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Phase‐Separation Engineering of Glass for Drastic Enhancement of Upconversion Luminescence

Fang

Chen

Peng

et al. 2019

Advanced Optical Materials

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earth (RE) ion-doped materials have been developed as significant gain matrices due to their high photoluminescence quantum yield (PLQY) and multiple-wavelength luminescence. [4,5] Recent decades have witnessed extensive investigations in doping methods and network structure design to obtain more efficient gain materials. [6,7] However, the requirements for high luminescence efficiency and excellent thermodynamic stability of optical materials are always contradictory, greatly restricting their applications in, e.g., high-temperature, high-humidity, and high-power laser pumping environments. Generally, the luminescence efficiency of an optical material is inversely proportional to the multiphonon nonradiative transition probability (W p ) of the intermediate state energy level for RE ions. [8] The luminescence process, especially for the upconversion (UC) process, is normally associated with a large number of intermediate state energy levels. Furthermore, its value (W p ) depends on the maximum phonon energy (ћω) of the elastic structure of condensed matter, and it increases dramatically with increasing ћω (as described in Equations (S1)-(S3) of the Supporting Information). [9] Traditionally, one class of soft material with extremely low ћω values, including fluorides, chalcogenides, and halogenides, has been widely Optical gain materials are of fundamental importance for various applications, such as lasers, lighting, optical communication, microscopy, and spectroscopy. However, the requirements for high luminescence efficiency and excellent thermodynamic stability of materials are always contradictory. As a result, wide applications of optical materials in high-temperature, high-humidity, and high-power laser-irradiated environments are restricted. Here, a facile approach based on phase-separation engineering is proposed to modulate the thermodynamic stability and enhance the luminescence efficiency of optical gain materials. It is shown that the thermodynamic stability and luminescence efficiency of the phase-separated fluorosilicate (FS) gain glass are both enhanced dramatically when the SiO 2 concentration is optimized. Owing to the confinement effect of phase-separation network structure on active ions, the upconversion (UC) luminescence efficiency of the designed glass is 150 times higher than that of traditional FS glasses and even seven times higher than that of ZBLAN (ZrF 4 -BaF 2 -LaF 3 -AlF 3 -NaF) glass, which is the most commonly used material for UC fiber lasing applications. These intriguing properties of the glass indicate that phase-separation engineering not only provides a powerful solution to conquer the conventional contradiction between thermodynamic stability and luminescence efficiency but also offers significant opportunities for manufacturing a wide range of optical composites with multiple functions.

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Crystal domain growth driven by nanometric phase separation in perfect surface crystallization

Cited by 13 publications

References 12 publications

Microstructure of Transparent Strontium Fresnoite Glass-Ceramics

Microstructure of Transparent Strontium Fresnoite Glass-Ceramics

Pockels effect of silicate glass-ceramics: Observation of optical modulation in Mach–Zehnder system

Phase‐Separation Engineering of Glass for Drastic Enhancement of Upconversion Luminescence

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