Glasses at early stages of phase sepn., while remaining amorphous, possess or not to possess 2nd-order optical nonlinearity (SON) depending on specific features of their short-range/medium range order and nanoinhomogeneous structure characterized with IR and Raman spectroscopy, x-ray diffraction, small-angle x-ray and neutron scattering and 2nd harmonic generation (SHG). It is demonstrated by the example of K Ti phosphate glasses of compn. near KTiOPO4 stoichiometry. Formation of nanoinhomogeneities, structure of which is similar to the structural motif of some nonlinear optical (NLO) crystal, favors SON. Heat treatment of such glasses at temps. near glass-transition temp. Tg stimulates remarkable SON enhancement keeping transparency and amorphous state. While temp. is increasing SHG grows up to values, comparable with those of NLO crystals with rise of Bragg reflections in the x-ray diffraction pattern of the glass and decrease of its transparency. Revealing correlations between structural peculiarities of glasses and their SON argues preference of description of short- and medium-range order in glasses with compn. close to boundaries of glass-forming regions from the position of quasi-crystallite models.

On relationship of atomic structure, nano-sized inhomogeneities and second-order optical non-linearity of K2O-TiO2-P2O5 glasses / V. N., Sigaev; S. V., Lotarev; P. D., Sarkisov; Stefanovich, S. Y. U.; O. V., Akimova; B., Champagnon; D., Vouagner; V., Califano; G. A., Komandin; A. A., Volkov; V. V., Koltashev; V. G., Plotnichenko; Pernice, Pasquale; Aronne, Antonio; Fanelli, Esther. - In: JOURNAL OF NON-CRYSTALLINE SOLIDS. - ISSN 0022-3093. - STAMPA. - 352:(2006), pp. 4142-4148.

On relationship of atomic structure, nano-sized inhomogeneities and second-order optical non-linearity of K2O-TiO2-P2O5 glasses

PERNICE, PASQUALE;ARONNE, ANTONIO;FANELLI, Esther
2006

Abstract

Glasses at early stages of phase sepn., while remaining amorphous, possess or not to possess 2nd-order optical nonlinearity (SON) depending on specific features of their short-range/medium range order and nanoinhomogeneous structure characterized with IR and Raman spectroscopy, x-ray diffraction, small-angle x-ray and neutron scattering and 2nd harmonic generation (SHG). It is demonstrated by the example of K Ti phosphate glasses of compn. near KTiOPO4 stoichiometry. Formation of nanoinhomogeneities, structure of which is similar to the structural motif of some nonlinear optical (NLO) crystal, favors SON. Heat treatment of such glasses at temps. near glass-transition temp. Tg stimulates remarkable SON enhancement keeping transparency and amorphous state. While temp. is increasing SHG grows up to values, comparable with those of NLO crystals with rise of Bragg reflections in the x-ray diffraction pattern of the glass and decrease of its transparency. Revealing correlations between structural peculiarities of glasses and their SON argues preference of description of short- and medium-range order in glasses with compn. close to boundaries of glass-forming regions from the position of quasi-crystallite models.
2006
On relationship of atomic structure, nano-sized inhomogeneities and second-order optical non-linearity of K2O-TiO2-P2O5 glasses / V. N., Sigaev; S. V., Lotarev; P. D., Sarkisov; Stefanovich, S. Y. U.; O. V., Akimova; B., Champagnon; D., Vouagner; V., Califano; G. A., Komandin; A. A., Volkov; V. V., Koltashev; V. G., Plotnichenko; Pernice, Pasquale; Aronne, Antonio; Fanelli, Esther. - In: JOURNAL OF NON-CRYSTALLINE SOLIDS. - ISSN 0022-3093. - STAMPA. - 352:(2006), pp. 4142-4148.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/203288
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