Influence of the lead difluoride on ion mobility and thermal behavior of glasses in the TeO2–PbO·P2O5–PbF2 system according to NMR and DTA data

Alexeiko, Leonid N.; Kavun, V. Ya.; Kharchenko, V. I.; Slobodyuk, A. B.; Maslennikova, I. I.; Гончарук, В. К.

doi:10.1016/j.jnoncrysol.2014.01.018

Cited by 11 publications

(6 citation statements)

References 16 publications

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“…For the model compounds, isotropic chemical shifts of −2631 and 1971 ppm are determined for PbF 2 and PbO, respectively, in good agreement with the literature. − For all of the glassy samples, extremely broad peaks typical of 207 Pb NMR signals in glasses are observed, which are dominated by the magnetic shielding anisotropy. The spectra resemble those observed in numerous other Pb containing oxide glasses − and could not be narrowed by the application of magic-angle spinning. This effect arises from extremely wide distributions of local magnetic shielding tensor values making it impossible to resolve spinning sideband manifolds.…”

Section: Resultssupporting

confidence: 63%

Structural Studies of Fluoroborate Laser Glasses by Solid State NMR and EPR Spectroscopies

et al. 2016

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The structure of glasses in the systems (100 – x)B2O3–xPbF2 (x = 30, 40, and 50) and 50B2O3–(50 – x)PbO–xPbF2 (x = 5, 10, 15, 20, 25, 30, 35, 40, and 45) has been studied by solid state NMR and EPR spectroscopies. On the basis of 11B and 19F high resolution solid state NMR as well as on 11B/19F double resonance results, we develop a quantitative structural description on the atomic scale. 19F NMR results indicate a systematic dependence of the fluoride speciation on PbF2 content: At low x-values, F– ions are predominantly found on BO3/2F– units, whereas, at higher x-values, fluoride tends to be sequestrated into amorphous domains rich in PbF2. In addition, both pulsed EPR studies of Yb3+ doped glasses and photophysical studies of Eu3+ doped samples indicate a mixed fluoride/borate coordination of the rare-earth ions and the absence of nanophase segregation effects.

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Section: Resultssupporting

confidence: 63%

Structural Studies of Fluoroborate Laser Glasses by Solid State NMR and EPR Spectroscopies

et al. 2016

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“…They combine high refractive index, nonlinear optical properties, and wide IR transmission windows and low-phonon environments for luminescent rare-earth ions, making them good candidates for laser and fiber optics devices. − In addition, the high network polarizability facilitates ionic mobility of cations , and anions for solid electrolyte applications. Aside from holding technological promise, tellurite glasses are also of great interest for the development of structural concepts for heavy metal oxide glasses. , While glasses based on TeO 2 as the single network former have poor thermal, mechanical, and crystallization stabilities, these properties can be considerably improved if additional network formers are included in the glass formulation. Beyond this benefit, the combination of several network formers usually offers the possibility of fine-tuning physical property combinations to special technological demands.…”

Section: Introductionmentioning

confidence: 99%

“…Aside from holding technological promise, tellurite glasses are also of great interest for the development of structural concepts for heavy metal oxide glasses. 9,10 While glasses based on TeO 2 as the single network former have poor thermal, mechanical, and crystallization stabilities, these properties can be considerably improved if additional network formers are included in the glass formulation. Beyond this benefit, the combination of several network formers usually offers the possibility of fine-tuning physical property combinations to special technological demands.…”

Section: ■ Introductionmentioning

confidence: 99%

Mixed Network Former Effects in Tellurite Glass Systems: Structure/Property Correlations in the System (Na₂O)_1/3[(2TeO₂)_x(P₂O₅)_1–x]_2/3

2015

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Mixed network former glasses in the system (Na2O)1/3[(2TeO2) x (P2O5)1–x ]2/3 have been prepared and characterized by DSC, density, and electrical conductivity measurements. Within the compositional region 0 < x < 0.5, the electrical conductivity shows a positive mixed network former effect, i.e., enhanced glass transition temperatures and ionic conductivities in relation to the linearly interpolated values between the corresponding binary sodium tellurite and sodium phosphate systems. The structural origins of this effect have been studied by 31P, 23Na, and 125Te high-resolution and dipolar solid-state nuclear magnetic resonance (NMR) techniques, O-1s, Na-1s, Te-3d5/2, and P-2p X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. A quantitative structural model has been developed that is consistent with all of the experimental data and provides a detailed description of network modification processes, interactions, and connectivities. For x values <0.5, the data evidence a preferential formation of Te–O–P linkages, whereas at higher x values, the connectivity distribution appears to be more random. 23Na NMR data suggest a dominant association of the network modifier species with the phosphate species for x ≤ 0.5, whereas for larger x values the participation of nonbridging oxygen atoms associated with tellurium becomes increasingly evident in 23Na{31P} rotational echo double resonance (REDOR) results. The enhanced T g values and electrical conductivities can be directly correlated with the preferential formation of Te3 4–O–P(3) and Te1 3–O–P(3) linkages, which both strengthen the network and create shallower Coulomb potentials via anionic charge delocalization.

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“…Furthermore, a glass formation of the TeO 2 -PbO•P 2 O 5 -PbF 3 : MF 3 system was investigated [7]. We analyzed in [7] the thermal properties and the ionic mobility in the system TeO 2 -PbO•P 2 O 5 -PbF 3 : MF 3 (M = Er, Eu, Nd) by the DTA and NMR methods. This paper is a continuation of the work mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…Recently the Pb(PO 3 ) 2 -TeO 2 glass system was studied in the whole range of glass composition [6]. Furthermore, a glass formation of the TeO 2 -PbO•P 2 O 5 -PbF 3 : MF 3 system was investigated [7]. We analyzed in [7] the thermal properties and the ionic mobility in the system TeO 2 -PbO•P 2 O 5 -PbF 3 : MF 3 (M = Er, Eu, Nd) by the DTA and NMR methods.…”

mentioning

confidence: 99%

Nucleation and crystallization behavior of RE - doped tellurite glasses

Гончарук

Mamaev

Силантьев

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The microstructure and crystallization of the glasses with composition (100-xy)TeO 2 -xPbO•P 2 O 5 -yPbF 2 :zMF 3 (M= Er, Eu, Nd; x=42.5-30, y=5-30, z=0.5-3.0) were investigated by transmission electron microscopy (TEM) and luminescence methods. It was found that the doping with the rare-earth (III) fluorides promoted nucleation in the bulk glasses. The sizes of generated particles are about 2-5 nanometers and their shapes are close to spherical. The growth rate of crystallites depended on the lead fluoride content and glass forming rate. The heat treatment of the samples promotes the glass ceramic formation, where the crystalline phase is Pb 2 P 2 O 7 . IntroductionTellurium dioxide based glasses are of increasing interest due to a possibility of their application as components of the optical data storage devices and telecommunication systems [1,2]. It is possible to use these glasses in production of lasers because of the high solubility of rare-earth ions and relatively low phonon energy among oxide glass-formers [3]. Doped glass ceramics are the most perspective materials for these applications. Rare-earth fluorides often act as nucleating centers [4].Preparation of oxyfluoride glasses in the ternary system TeO 2 -PbF 2 -CdF 2 was reported previously [5]. Recently the Pb(PO 3 ) 2 -TeO 2 glass system was studied in the whole range of glass composition [6]. Furthermore, a glass formation of the TeO 2 -PbO•P 2 O 5 -PbF 3 : MF 3 system was investigated [7]. We analyzed in [7] the thermal properties and the ionic mobility in the system TeO 2 -PbO•P 2 O 5 -PbF 3 : MF 3 (M = Er, Eu, Nd) by the DTA and NMR methods. This paper is a continuation of the work mentioned above. Our purpose was to consider an effect of the rare-earth (III) fluorides on crystallization of the TeO 2 -PbO•P 2 O 5 -PbF 3 : MF 3 system.

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Influence of the lead difluoride on ion mobility and thermal behavior of glasses in the TeO2–PbO·P2O5–PbF2 system according to NMR and DTA data

Cited by 11 publications

References 16 publications

Structural Studies of Fluoroborate Laser Glasses by Solid State NMR and EPR Spectroscopies

Structural Studies of Fluoroborate Laser Glasses by Solid State NMR and EPR Spectroscopies

Mixed Network Former Effects in Tellurite Glass Systems: Structure/Property Correlations in the System (Na₂O)_1/3[(2TeO₂)_x(P₂O₅)_1–x]_2/3

Nucleation and crystallization behavior of RE - doped tellurite glasses

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Influence of the lead difluoride on ion mobility and thermal behavior of glasses in the TeO2–PbO·P2O5–PbF2 system according to NMR and DTA data

Cited by 11 publications

References 16 publications

Structural Studies of Fluoroborate Laser Glasses by Solid State NMR and EPR Spectroscopies

Structural Studies of Fluoroborate Laser Glasses by Solid State NMR and EPR Spectroscopies

Mixed Network Former Effects in Tellurite Glass Systems: Structure/Property Correlations in the System (Na2O)1/3[(2TeO2)x(P2O5)1–x]2/3

Nucleation and crystallization behavior of RE - doped tellurite glasses

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Mixed Network Former Effects in Tellurite Glass Systems: Structure/Property Correlations in the System (Na₂O)_1/3[(2TeO₂)_x(P₂O₅)_1–x]_2/3