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1

Wpływ tlenku baru na właściwości szkieł tellurowych

Grelowska I., Pałczyńska N.

Szkło i Ceramika

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2016

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R. 67, nr 2

12--15

PL

W pracy przedstawiono badania dotyczące wpływu tlenku baru na właściwości szkieł tellurowych z układów TeO2–BaO–Na2O (TBN) oraz TeO2–BaO–WO3 (TBW). Wykazano, że szkła tellurowe z układu TBW charakteryzują się wyższą gęstością w stosunku do szkieł z układu TBN. Wyznaczono właściwości optyczne szkieł takie jak: współczynnik załamania światła, transmisja w zakresie widzialnym i w podczerwieni oraz współczynnik absorpcji. Na podstawie przeprowadzonych badań elipsometrycznych stwierdzono, że szkła TBW charakteryzują się wyższym współczynnikiem załamania światła w stosunku do szkieł TBN. Wyniki badań transmisji oraz współczynnika absorpcji wykazały wysoką przepuszczalność badanych szkieł tellurowych. Uzyskane parametry optyczne są interesujące z punktu widzenia konstrukcji układów optoelektronicznych.

EN

The aim of this work was the research on the effect of barium oxide content on tellurite glass properties of the TeO2–BaO–Na2O (TBN) and TeO2–BaO–WO3 (TBW) system. The TBW glasses are characterized by the higher density compared to the glasses of the TBN system. The optical measurements such as refractive index, transmission, and absorption coefficient have been done. On the basis of ellipsometric studies it was stated that TBW glasses are characterized by the higher value of the refractive index in comparison to TBN glasses. The transmission and absorption coefficient of glasses obtained are very high. All optical properties obtained are interesting due to their application in optoelectronic field.

2

Lantanowce w szkłach chalkogenidkowych

Reben M., Burtan B.

Materiały Ceramiczne

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2012

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T. 64, nr 2

248-251

PL

W artykule przedstawiono technologię syntezy szkieł tellurowych aktywowanych wybranymi pierwiastkami ziem rzadkich (RE). Celem pracy było zbadanie wpływu aktywnych domieszek Nd3+, Er3+ oraz Pr3+ na wybrane parametry optyczne. Zbadano wpływ aktywnych domieszek na współczynnik załamania światła. Pomiary optyczne wykonano przy użyciu elipsometru spektroskopowego M2000 firmy Woollam w zakresie widmowym 190-1700 nm. Krzywe doświadczalne w zakresie 300-1700 nm przypominają swoim kształtem krzywą Cauchy'ego, dlatego też zastosowano taki model teoretyczny dopasowania do wartości eksperymentalnych kątów ? i ?. Wpływ pierwiastków RE na charakter przejść radiacyjnych dla poziomów wzbudzonych jonów Nd3+, Er3+ oraz Pr3+ wyznaczono przy użyciu standardowej teorii Judd-Ofelta.

EN

The synthesis of tellurite glasses doped with rare earth (RE) is presented. The study is focused on investigation of the effect of Nd3+, Er3 + and Pr3 + active dopants on selected optical properties of tellurite glasses. The refractive index of the glasses was measured. The spectral dependence of ellipsometric angles ? and ? of the tellurite glass samples was determined. The optical measurements were conducted on Woollam M2000 spectroscopic ellipsometer in a spectral range of 190-1700 nm. The radiative transition probabilities for excited levels of Nd3+, Er3+, Pr3+ have been calculated using the standard Judd-Ofelt (J-O) theory.

3

Influence of active admixtures onto tellurite glass refractive index

Reben M., Wasylak J., Jaglarz J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2010

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Vol. 58, nr 4

519-522

EN

The goal of this work was to investigate the influence of rare earth ions such as Tm3+, Yb3+ on physico-chemical properies of tellurite glass from the TeO2-WO3-PbO-PbF2-Na2O system. The thermal characteristic of tellurite glass Tm3+, Yb3+ doped have been presented. The effect of the glass crystallization on thermal stability of the glass and crystallizing phases formed upon heat treatment were investigated by DTA/DSC/, XRD methods. The spectral dependence of ellipsometric angles of the tellurite glass samples, have been studied. The influence of ions of rare earth elements, i.e. Tm 3+ and Yb3+, onto changes of refractive index of glass P1 (without RE admixture) were examined. The optical measurements were conducted on Woollam M2000 spectroscopic ellipsometer, in spectral range of 190–1700 nm.

4

Investigations of tellurite glasses for optoelectronics devices

Golis E.P., Reben M., Wasylak J., Filipecki J.

Optica Applicata

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2008

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Vol. 38, nr 1

163-169

EN

The goal of the work was to characterize and synthesize tellurite glasses from the TeO2-WO3-PbO-La2O3 system. The effect of lanthanum oxide content on the tendency to the crystallization of glassy matrix was investigated. Differential thermal analysis DTA/DSC, XRD measurement were considered in terms of the lanthanum oxide influence. Presented work is a continuation of investigations of tellurite glasses with use of the Faraday effect method. The Faraday effect is a rotation of polarization of linearly polarized light in an isotropic transparent material under the magnetic field. It has been stated that the addition of lanthanum to tellurite glass from the TeO2-WO3-PbO system hinders the crystallization process of glass which is very important during fiber drawing. Tellurite glasses have physical and chemical properties that make this class of materials a potential candidate in different applications, such as electrochemical and optoelectronic devices. In the field of photonics these glasses may be used as precursors for infrared fibers or windows due to the possibility of changing their phonon energies and therefore the domain of wavelength transparency as a function of compositions.

5

Conductivity studies in mixed alkali vanadotellurite glasses

Kumar M.P., Sankarappa T.

Materials Science Poland

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2008

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Vol. 26, No. 3

647--657

EN

A set of novel mixed alkali vanadotellurite glasses (V2O5)0.25(Li2O)0.25(K2O)x(TeO2)1.x (0.05 . x . 0.30) have been investigated for density and dc conductivity in the temperature range from 380 K to 480 K. The density exhibited a minimum, and molar volume showed a maximum at x = 0.20. Conductivity data have been analyzed in the light of Mott�fs small polaron hopping model and high temperature activation energy values have been determined. The conductivity and activation energy also passed through a minimum and maximum, respectively, at x = 0.20. This result has been attributed to the mixed alkali effect. The strength of mixed alkali effect has been estimated. It is for the first time that vanadotellurite glasses are shown to exhibit mixed alkali effect. Various physical and polaron hopping parameters have been determined and discussed.