Average single bond strength and optical basicity of Na2O-GeO2 glasses

Dimitrov, V.; Komatsu, Takayuki

doi:10.2109/jcersj2.117.1105

Cited by 22 publications

(24 citation statements)

References 23 publications

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“…The so-called theoretical optical basicity ª th , which is based on the approach by Duffy and Haris, 35) and the theoretical interionic interaction parameter A th , which was first introduced by Dimitrov and Komatsu,30) are very important concepts for deep understanding of the electronic polarizability and chemical bonding strength of materials. In the case of multi-component glasses, it is possible to determine the values of the optical basicity and interionic interaction parameter from their chemical compositions without measuring the density and refractive index of a given glass.…”

Section: Theoretical Interionic Interaction Parametermentioning

confidence: 99%

“…(7) and (8). Of course, we know that the coordination state and chemical bonding state of ions in glasses are extremely complicated, e.g., the presence of different oxygen coordination numbers such as BO 3 and BO 4 , the presence of bridging and nonbridging oxygens, and a wide distribution of ionic distance and bonding angles. The flexibility and distribution in the structure and bonding in glasses might be one reason for the deviations between the experimentally determined values and theoretically calculated values shown in Figs.…”

Section: Theoretical Interionic Interaction Parametermentioning

confidence: 99%

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Correlation between thermal expansion coefficient and interionic interaction parameter in ZnO–Bi2O3–B2O3 glasses

Komatsu

Inoue

Tasheva

et al. 2018

J. Ceram. Soc. Japan

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The volume thermal expansion coefficients (¢) in 50300°C of xZnOyBi 2 O 3 zB 2 O 3 glasses (x = 1065, y = 10 50, z = 2560 mol %) were measured and the refractive index-based interionic interaction parameters A(n o ) were estimated from oxide ion electronic polarizabilities to acquire deeper insight into the relationship between the electronic polarizability and chemical bonding state of oxide glasses. The glasses have relatively large values of ¢ = 210289 © 10 ¹7 K ¹1 , and the substitution of ZnO for B 2 O 3 and the increase in Bi 2 O 3 content result in an increase in ¢. The values of A(n o ) decrease with the substitution of ZnO for B 2 O 3 and the substitution of Bi 2 O 3 for ZnO. An almost linear correlation was observed between ¢ and A(n o ), i.e., the volume thermal expansion coefficient decreases with increases in the interionic interaction parameter. A good correlation was also observed between A(n o ) and the refractive index-based optical basicity ª(n o ). The interionic interaction parameter is helpful for understanding the chemical bonding state of oxide glasses.

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Section: Theoretical Interionic Interaction Parametermentioning

confidence: 99%

Section: Theoretical Interionic Interaction Parametermentioning

confidence: 99%

Correlation between thermal expansion coefficient and interionic interaction parameter in ZnO–Bi2O3–B2O3 glasses

Komatsu

Inoue

Tasheva

et al. 2018

J. Ceram. Soc. Japan

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“…But the ionic potential/polarisability of cation does not give any idea of the degree of ionicity in an oxide. Dimitrov et al did an extensive work on the polarisability approach and they have calculated the interaction parameter for many simple and mixed oxides [12][13][14][15]. They considered that the bond strength in an oxide depends on the electron bonding in overlapping orbitals of anions and cations.…”

Section: Introduction To Chemical Approach and Polarisabilitymentioning

confidence: 99%

“…They considered that the bond strength in an oxide depends on the electron bonding in overlapping orbitals of anions and cations. That can be related to the polarisability of ions [13], namely a tendency of charge centres to shift relatively. If the polarisability is large, the electron cloud in overlapping orbitals shifts and separates more, and hence a larger amount of free electrons becomes available.…”

Section: Introduction To Chemical Approach and Polarisabilitymentioning

confidence: 99%

“…If the polarisability is large, the electron cloud in overlapping orbitals shifts and separates more, and hence a larger amount of free electrons becomes available. The cation and anion polarisability can be expressed by a single parameter, namely the interaction parameter [13]. Dimitrov et al classified oxides into acidic, basic, and very basic materials on the basis of their polarisability and interaction parameter.…”

Section: Introduction To Chemical Approach and Polarisabilitymentioning

confidence: 99%

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The Lubricity of Oxides Revised Based on a Polarisability Approach

Prakash

Célis

2007

Tribol Lett

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The lubricity of a wide variety of solid oxides at high temperature is analysed mainly based on the existing polarisability approach. The starting point is that the interaction between ions in an oxide depends on how strongly electrons are interacting in overlapping orbitals. This is related to the polarisability of ions. From this polarisability, the interaction between cation and anion present in an oxide was calculated for binary/mixed oxides and for six new simple oxides (values for 17 oxides collected from literature) and correlated to the coefficient of friction of these oxides below their melting temperature. Based on that correlation, the mechanism of friction of these oxides is proposed.

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Chemically Stable Yttrium and Tin Co‐Doped Barium Zirconate Electrolyte for Next Generation High Performance Proton‐Conducting Solid Oxide Fuel Cells

Sun

Liu

2013

Advanced Energy Materials

158

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BZSY) is developed as a novel chemically stable proton conductor for solid oxide fuel cells (SOFCs). BZSY possesses the same cubic symmetry of space group Pm-3m with BaZr 0.8 Y 0.2 O 3-δ (BZY). Thermogravimetric analysis (TGA) and X-ray photoelectron spectra (XPS) results reveal that BZSY exhibits remarkably enhanced hydration ability compared to BZY. Correspondingly, BZSY shows signifi cantly improved electrical conductivity. The chemical stability test shows that BZSY is quite stable under atmospheres containing CO 2 or H 2 O. Fully dense BZSY electrolyte fi lms are successfully fabricated on NiO-BZSY anode substrates followed by co-fi ring at 1400 ° C for 5 h and the fi lm exhibits excellent electrical conductivity under fuel cell conditions. The single cell with a 12-μ m-thick BZSY electrolyte fi lm outputs by far the best performance for acceptor-doped BaZrO 3 -based SOFCs. With wet hydrogen (3% H 2 O) as the fuel and static air as the oxidant, the peak power density of the cell achieves as high as 360 mWcm − 2 at 700 ° C, an increase of 42% compared to the reported highest performance of BaZrO 3based cells. The encouraging results demonstrate that BZSY is a good candidate as the electrolyte material for next generation high performance proton-conducting SOFCs.

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Average single bond strength and optical basicity of Na2O-GeO2 glasses

Cited by 22 publications

References 23 publications

Correlation between thermal expansion coefficient and interionic interaction parameter in ZnO–Bi<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub> glasses

Correlation between thermal expansion coefficient and interionic interaction parameter in ZnO–Bi<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub> glasses

The Lubricity of Oxides Revised Based on a Polarisability Approach

Chemically Stable Yttrium and Tin Co‐Doped Barium Zirconate Electrolyte for Next Generation High Performance Proton‐Conducting Solid Oxide Fuel Cells

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