Optic properties of niobium-phosphate glasses containing lithium, sodium, and potassium oxides

Olshin, Pavel K.; Поволоцкий, А. В.; Manshina, Alina; Markov, V. A.; Соколов, И. А.

doi:10.1134/s1087659617040095

Cited by 6 publications

(6 citation statements)

References 14 publications

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“…We have previously shown 46 that the introduction of niobium pentoxide into alkali metal metaphosphate leads to the formation of absorption bands in the Raman spectra corresponding to vibrations of the Nb‐O bond in [NbO 6 ] 7− octahedra and vibrations of various modes of O‐Nb‐O as well as equatorial vibrations of Nb‐O in NbPO 5 . A decrease in the intensity of the bands is observed compared to the spectra of metaphosphates, which is attributed to the vibrations of bridging bonds in phosphates.…”

Section: Resultsmentioning

confidence: 99%

“…According to Raman spectroscopy data, the structures of sodium and potassium lithium metaphosphates are similar, as are the structures of [Li(Na,K)] 2 O‐Nb 2 O 5 ‐P 2 O 5 glasses. When the type of alkaline ion changes, new absorption bands do not appear, and the existing ones are slightly shifted to the low‐frequency region due to the increasing mass of the alkaline ion in the Li → Na → K series 46 …”

Section: Resultsmentioning

confidence: 99%

“…In this case, an increase in Q* and D T with an increase in the content of niobium oxide can be explained by an increase in When the type of alkaline ion changes, new absorption bands do not appear, and the existing ones are slightly shifted to the low-frequency region due to the increasing mass of the alkaline ion in the Li → Na → K series. 46 Consequently, the decrease in the heat of transfer (as well as the decrease in the thermal diffusion coefficient) in the Li → Na → K series is caused by the increasing ionic radius in this series.…”

Section: (12)mentioning

confidence: 99%

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Thermodiffusion of alkali ions in alkali niobophosphate glasses

Markov

Kurushkin

Соколов

2020

Int J of Appl Glass Sci

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A method is proposed for determination of the thermal diffusion coefficients of mobile ions through the study of ionic thermoelectric power. Ionic Seebeck coefficients and the heats of ion transport have been measured in [Li(Na,K)]2O‐Nb2O5‐P2O5 glasses. The mixed alkali effect influence on the thermoelectric power has been reported for the first time in glasses. Soret coefficients have been calculated for all monoalkali glass samples synthesized in this work. Type of the alkali ion and Nb2O5 content dependence of the heat of transfer and thermal diffusion coefficient have been analyzed and discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: (12)mentioning

confidence: 99%

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Thermodiffusion of alkali ions in alkali niobophosphate glasses

Markov

Kurushkin

Соколов

2020

Int J of Appl Glass Sci

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“…A significant number of bands refer to oscillations in C-H, C-N, and C-N-H bonds forming protein [7,8]. A number of weak bands in the range 200 1200 cm -1 can be attributed to oscillations in complex sodium aluminum phosphates [9,10]. Figure 3 presents fragments of the Raman spectra in the oscillation region of PO 4 3-bonds.…”

Section: Spectroscopymentioning

confidence: 99%

Effect of Long-Term Exposure within the Body on the Condition of Polyurethane Membranes of Breast Prostheses

et al. 2016

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In the early 1990s, Perm State University in con junction with the Institute of Continuous Media Mechanics of the Russian Academy of Sciences devel oped technology for manufacturing thin closed polyurethane membranes. These membranes were filled with silicone gel to produce one possible end product, breast prostheses. After conducting the necessary studies, permission to conduct clinical trials was received. Details of the work have been published [1 4].The membranes are made of polyurethane on the base of simple ethers polyTHF OP 15 (poly(tetrahy drofuran) oxypropylene), which are least prone to hydrolysis in the body; a thin (0.2 0.3 mm) membrane was made by solution technology and cured on a man drel by heating MOCA hardener. Preliminary studies in model media and in animals suggested that in the case of long term presence in the body, the physical and mechanical properties of these membranes remain con stant.As a result of collaboration with surgeons, samples of polyurethane membranes were available that had been present in the human body for periods from 2 months to 18 years. The membranes were removed for various rea sons: in the early stages -due to complications and inflammations, and later -on the patients' request.It is known that implants intended for long term (years) functioning in the body must maintain long term biocompatibility:− not change physical and chemical properties that ensure function of the implant;− not cause chronic inflammation; − not exhibit carcinogenic effect; − not be subject to calcification. Calcification is defined as formation of calcium deposits on the surface or in the bulk of implantable devices. In contrast to bone, where calcification plays a positive role, the calcification of foreign surfaces in con tact with blood and soft tissues is dystrophic and is char acterized by deposits of calcium salts (mainly phosphates) in areas of damage or degeneration of the tissues for nor mal blood levels of calcium and phosphorus ions. Calcification mechanisms are discussed in detail in the monograph of Rozanova and Vasin [5].Rozanova and Vasin [5] describe analysis of poly urethane samples (Avkotan and Biomer) after 168 days of implantation. Information about the behavior of thin film polyurethane implants with long term presence in the body is scarce, and in the case of several year long presence there is no information at all, so the study of membranes that were present in the human body up to 18 years is of particular interest.The objective was to study the results of the interac tion of polyurethane membranes with body tissues.The surface of polyurethane membranes of breast prostheses that were present in the human body for a long time were studied with instrumental methods of IR and Raman spectroscopy, atomic force microscopy, and energy dis persive spectrometry. It was found that the membrane surface was partially covered by plaque containing calcium and phosphorus.

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“…In phosphate glasses, niobium acts as a network former forming P‐O‐Nb bonds and Nb‐O‐Nb chains at high Nb 2 O 5 content 1,2,17 . The coordination of niobium is found to be octahedral, 1,2,5,6,17–20 however, some studies also report the presence of tetrahedral NbO 4 units in phosphate glasses 3,4 . In combination with alkali oxide, niobium oxide can be incorporated in a phosphate network in a wide compositional range which makes these glass systems interesting from the point of view of electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Transport of potassium ions in niobium phosphate glasses

et al. 2021

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The influence of Nb2O5 on the structure and ionic conductivity of potassium phosphate glasses was investigated in glasses with composition xNb2O5–(100‐x)[0.45K2O–0.55P2O5], x = 10–47 mol%. The Raman spectra of glasses reveal a transition from predominantly orthophosphate to predominantly niobate glass network with increasing Nb2O5 content. In the glass structure, niobium forms NbO6 octahedra which are interlinked with phosphate units for the glass containing 10 mol% Nb2O5, but for higher Nb2O5 content they become mutually interconnected via Nb‐O‐Nb bonds. The transport of potassium ions was found to be strongly dependent on the structural characteristics of the glass network. While the mixed niobate‐phosphate glass network hinders the diffusion of potassium ions by providing traps that immobilize them and/or by blocking the conduction pathways, predominantly niobate glass network exhibits a rather facilitating effect which is evidenced in the trend of DC conductivity as well as in the features of the frequency‐dependent conductivity and typical hopping lengths of potassium ions.

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Optic properties of niobium-phosphate glasses containing lithium, sodium, and potassium oxides

Cited by 6 publications

References 14 publications

Thermodiffusion of alkali ions in alkali niobophosphate glasses

Thermodiffusion of alkali ions in alkali niobophosphate glasses

Effect of Long-Term Exposure within the Body on the Condition of Polyurethane Membranes of Breast Prostheses

Transport of potassium ions in niobium phosphate glasses

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