KTiOPO4 precipitation from potassium titanium phosphate glasses, producing second harmonic generation

Сигаев, В. Н.; Pernice, P.; Aronne, Antonio; Akimova, Olga A.; Stefanovich, S. Yu.; Scaglione, Antonio

doi:10.1016/s0022-3093(01)00872-9

Cited by 67 publications

(46 citation statements)

References 24 publications

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“…Since the scattering intensity is not high, these heterogeneities can be characterized either by a small number or by a small difference between the electron density of the matrix and the particle. Electron microscopy data corroborate the absence of microheterogeneities in this glass [5]. Glass KTP-10B-T exhibits an extended nanostructure with the characteristic particle size equal to 45 Å according to SASRS and around 50 Å according to SANS data.…”

supporting

confidence: 71%

“…Glasses of the composition K 2 O × 2TiO 2 × P 2 O 5 with additives SiO 2 , P 2 O 5 , and K 2 O × 2B 2 O 3 × 7SiO 2 have been obtained [5 -8] and their crystallization behavior and NLO properties, which depend significantly on the type of additive, have been studied. It was stated in [5,6] that, depending on the additive type, the first crystalline nanophase may be either KTiOPO 4 , or CS phases, which has a crucial effect on the formation of QON in clear glasses.…”

mentioning

confidence: 99%

“…For our study we selected glass compositions 90(K 2 O × 2TiO 2 × P 2 O 5 ) × 10B 2 O 3 (KTP-10B), 90(K 2 O × 2TiO 2 × P 2 O 5 ) × 10SiO 2 (KTP-10Si), and 93(K 2 O × 2TiO 2 × P 2 O 5 ) × 7P 2 O 5 (KTP-7P) that have been studied by us previously [5,6]. Glasses were prepared by fast cooling of melts; the melting and working procedure is described in detail in [5,6].…”

mentioning

confidence: 99%

“…Glasses were prepared by fast cooling of melts; the melting and working procedure is described in detail in [5,6]. The x-ray patterns of glasses were obtained using a DRON-3M diffractometer (CuK a radiation).…”

mentioning

confidence: 99%

“…The standard reference sample was a-quartz powder. All data on SCG signals are given in relative units I 2w /I 2w (SiO 2 , where I 2w is the intensity of SGG in the sample analyzed and I 2w (SiO 2 ) is the intensity of SHG in a-quartz powder under the same parameters of the measuring device [5].…”

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confidence: 99%

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Correlation between atomic structure, structural nanoinhomogeneity, and quadratic optical nonlinearity in glasses of the K2O-TiO2-P2O5 system

et al. 2006

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The methods of small angle synchrotron radiation scattering, vibration spectroscopy, and second harmonic generation are applied to glasses of the K 2 O -TiO 2 -P 2 O 5 system near the stoichiometry of potassium titanyl-phosphate to demonstrate that at the initial stage of phase separation, while glass remains x-ray amorphous and clear, it can possess quadratic optical nonlinearity. The emergence of nonlinearity is facilitated by the formation of nanoheterogeneities in glass whose structure resembles the structural pattern of a nonlinear-optical crystal. A correlation established between the structural specifics of x-ray amorphous glass and its quadratic optical nonlinearly suggests the advisability of describing the short-range and medium-range orders of glasses at the glass-formation boundary in the context of quasicrystallite models.The needs of optoelectronic engineering has stimulated an increasing number of studies dedicated to new nonlinear-optic (NLO) materials, such as crystals, ceramics, clear glass ceramics, and lately glass as well. Glass is a centrosymmetric (CS) medium and, accordingly, does not have even-order optical nonlinearity. The transparency and stable properties of oxide glasses, the possibility of gradual variation of their properties and imparting virtually any shape to glass elements, and their low cost and technological availability attract the attention of researchers, who attempt to induce quadratic optical nonlinearity (QON) in glass [1 -5].One of the methods for inducing QON is homogeneous or heterogeneous nucleation of non-centro-symmetric crystals in a glass volume. It is possible to achieve the second optical harmonic generation (SHG) in such nano-or microstructured glasses while retaining the transparency of the medium. Due to a relatively low concentration and a random orientation of nanocrystals, the SHG signal is significantly weaker than in monocrystals of the same composition. Therefore, to produce nanostructured glasses with a high QON it is advisable, first, to select glass compositions and heat-treatment schedules ensuring the maximum formation of a NLO crystalline phase in glass and, second, to endeavor to achieve the closest possible coordination between the refractive indexes of the matrix glass and crystals, which is especially important when crystals grow to submicron sizes, in which case media with QON comparable to that of monocrystals can be obtained. The possibility of significantly intensifying NLO effects by extruding nanostructural fiberglass and the prospects of the controlled development of complex surface and volumetric NLO structures separated by a clear matrix with a coordinated refractive index has generated even greater interest in glass as an active medium.Both above specified conditions are frequently satisfied in homogeneous nucleation, where the initial glass has a composition similar to that of the crystalline phase emerging in this glass. Therefore, the K 2 O -TiO 2 -P 2 O 5 system (KTP) can be regarded as a promising glass-forming system for nano...

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confidence: 71%

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confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Correlation between atomic structure, structural nanoinhomogeneity, and quadratic optical nonlinearity in glasses of the K2O-TiO2-P2O5 system

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Preparation, characterization, antifungal activity, and mechanism of chitosan/TiO₂ hybrid film against bipolaris maydis

Huang

Jiao

et al. 2012

J of Applied Polymer Sci

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A chitosan/TiO 2 hybrid film, as a powerful antifungal material for controlling southern corn leaf blight, which is caused by the fungus Bipolaris maydis (B. maydis), was prepared and characterized. Its antifungal activity toward B. maydis was studied, and the experimental results indicate that it had multiple attractive antifungal properties as follows: (1) it displayed strong antifungal activity against B. maydis, with an inhibition ratio of 100% under both visible-light irradiation and in a dark environment; (2) it exhibited a superior antifungal efficacy of 100%, even after 4 h under the irradiation of visible light; and (3) its antifungal activity included the effect of hydroxyl radicals generated by the photocatalysis of TiO 2 . The antifungal mechanism was attributed to the action of a large amount of positive charges on the structure of the hybrid film, which interacted with the negative charges from the cell and finally resulted in the inactivation of B. maydis.

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Optical Materials and Their Properties

Brinkmann¹,

Hayden²,

Letz

et al. 2007

Springer Handbook of Lasers and Optics

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KTiOPO4 precipitation from potassium titanium phosphate glasses, producing second harmonic generation

Cited by 67 publications

References 24 publications

Correlation between atomic structure, structural nanoinhomogeneity, and quadratic optical nonlinearity in glasses of the K2O-TiO2-P2O5 system

Correlation between atomic structure, structural nanoinhomogeneity, and quadratic optical nonlinearity in glasses of the K2O-TiO2-P2O5 system

Preparation, characterization, antifungal activity, and mechanism of chitosan/TiO₂ hybrid film against bipolaris maydis

Optical Materials and Their Properties

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KTiOPO4 precipitation from potassium titanium phosphate glasses, producing second harmonic generation

Cited by 67 publications

References 24 publications

Correlation between atomic structure, structural nanoinhomogeneity, and quadratic optical nonlinearity in glasses of the K2O-TiO2-P2O5 system

Correlation between atomic structure, structural nanoinhomogeneity, and quadratic optical nonlinearity in glasses of the K2O-TiO2-P2O5 system

Preparation, characterization, antifungal activity, and mechanism of chitosan/TiO2 hybrid film against bipolaris maydis

Optical Materials and Their Properties

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Preparation, characterization, antifungal activity, and mechanism of chitosan/TiO₂ hybrid film against bipolaris maydis